diff --git a/imports.go b/imports.go
index 7b9ae0d..661a606 100644
--- a/imports.go
+++ b/imports.go
@@ -68,19 +68,18 @@ func (cache *ImportCache) importData(key importCacheKey) *ImportCacheValue {
 	return &val
 }
 
-func (cache *ImportCache) ImportString(codeDir, importedPath string) (*valueString, error) {
+func (cache *ImportCache) ImportString(codeDir, importedPath string, e *evaluator) (*valueString, error) {
 	data := cache.importData(importCacheKey{codeDir, importedPath})
 	if data.data.err != nil {
-		return nil, data.data.err
+		return nil, e.Error(data.data.err.Error())
 	}
-	// TODO(sbarzowski) wrap error in runtime error
 	return makeValueString(data.data.content), nil
 }
 
 func (cache *ImportCache) ImportCode(codeDir, importedPath string, e *evaluator) (value, error) {
 	cached := cache.importData(importCacheKey{codeDir, importedPath})
 	if cached.data.err != nil {
-		return nil, cached.data.err
+		return nil, e.Error(cached.data.err.Error())
 	}
 	if cached.asCode == nil {
 		node, err := snippetToAST(cached.data.foundHere, cached.data.content)
@@ -141,6 +140,11 @@ func (importer *FileImporter) Import(dir, importedPath string) *ImportedData {
 		}
 	}
 
+	if !found {
+		return &ImportedData{
+			err: fmt.Errorf("Couldn't open import %#v: No match locally or in the Jsonnet library paths.", importedPath),
+		}
+	}
 	return &ImportedData{content: string(content), foundHere: foundHere}
 }
 
diff --git a/interpreter.go b/interpreter.go
index 6f10a53..94f5d1a 100644
--- a/interpreter.go
+++ b/interpreter.go
@@ -370,14 +370,12 @@ func (i *interpreter) evaluate(a ast.Node, context *TraceContext) (value, error)
 		return nil, e.Error(fmt.Sprintf("Value non indexable: %v", reflect.TypeOf(targetValue)))
 
 	case *ast.Import:
-		// TODO(sbarzowski) put this information in AST instead of getting it out of tracing data...
-		codeDir := path.Dir(e.trace.loc.FileName)
+		codeDir := path.Dir(ast.Loc().FileName)
 		return i.importCache.ImportCode(codeDir, ast.File, e)
 
 	case *ast.ImportStr:
-		// TODO(sbarzowski) put this information in AST instead of getting it out of tracing data...
-		codeDir := path.Dir(e.trace.loc.FileName)
-		return i.importCache.ImportString(codeDir, ast.File)
+		codeDir := path.Dir(ast.Loc().FileName)
+		return i.importCache.ImportString(codeDir, ast.File, e)
 
 	case *ast.LiteralBoolean:
 		return makeValueBoolean(ast.Value), nil
diff --git a/main_test.go b/main_test.go
index 62f30d4..ad02162 100644
--- a/main_test.go
+++ b/main_test.go
@@ -62,15 +62,15 @@ func removeExcessiveWhitespace(s string) string {
 func TestMain(t *testing.T) {
 	flag.Parse()
 	var mainTests []mainTest
-	match, err := filepath.Glob("testdata/*.input")
+	match, err := filepath.Glob("testdata/*.jsonnet")
 	if err != nil {
 		t.Fatal(err)
 	}
 	for _, input := range match {
 		golden := input
 		name := input
-		if strings.HasSuffix(input, ".input") {
-			name = input[:len(input)-len(".input")]
+		if strings.HasSuffix(input, ".jsonnet") {
+			name = input[:len(input)-len(".jsonnet")]
 			golden = name + ".golden"
 		}
 		mainTests = append(mainTests, mainTest{name: name, input: input, golden: golden})
@@ -106,12 +106,12 @@ func TestMain(t *testing.T) {
 				// TODO(sbarzowski) better reporting of differences in whitespace
 				// missing newline issues can be very subtle now
 				t.Fail()
-				t.Errorf("Mismatch when running %s.input. Golden: %s\n", test.name, test.golden)
+				t.Errorf("Mismatch when running %s.jsonnet. Golden: %s\n", test.name, test.golden)
 				data := diff(output, string(golden))
 				if err != nil {
 					t.Errorf("computing diff: %s", err)
 				}
-				t.Errorf("diff %s jsonnet %s.input\n", test.golden, test.name)
+				t.Errorf("diff %s jsonnet %s.jsonnet\n", test.golden, test.name)
 				t.Errorf(string(data))
 
 			}
diff --git a/testdata/argcapture_builtin_call.input b/testdata/argcapture_builtin_call.jsonnet
similarity index 100%
rename from testdata/argcapture_builtin_call.input
rename to testdata/argcapture_builtin_call.jsonnet
diff --git a/testdata/array.input b/testdata/array.jsonnet
similarity index 100%
rename from testdata/array.input
rename to testdata/array.jsonnet
diff --git a/testdata/array_index1.input b/testdata/array_index1.jsonnet
similarity index 100%
rename from testdata/array_index1.input
rename to testdata/array_index1.jsonnet
diff --git a/testdata/array_index2.input b/testdata/array_index2.jsonnet
similarity index 100%
rename from testdata/array_index2.input
rename to testdata/array_index2.jsonnet
diff --git a/testdata/array_index3.input b/testdata/array_index3.jsonnet
similarity index 100%
rename from testdata/array_index3.input
rename to testdata/array_index3.jsonnet
diff --git a/testdata/array_index4.input b/testdata/array_index4.jsonnet
similarity index 100%
rename from testdata/array_index4.input
rename to testdata/array_index4.jsonnet
diff --git a/testdata/arrcomp.input b/testdata/arrcomp.jsonnet
similarity index 100%
rename from testdata/arrcomp.input
rename to testdata/arrcomp.jsonnet
diff --git a/testdata/arrcomp2.input b/testdata/arrcomp2.jsonnet
similarity index 100%
rename from testdata/arrcomp2.input
rename to testdata/arrcomp2.jsonnet
diff --git a/testdata/arrcomp3.input b/testdata/arrcomp3.jsonnet
similarity index 100%
rename from testdata/arrcomp3.input
rename to testdata/arrcomp3.jsonnet
diff --git a/testdata/arrcomp4.input b/testdata/arrcomp4.jsonnet
similarity index 100%
rename from testdata/arrcomp4.input
rename to testdata/arrcomp4.jsonnet
diff --git a/testdata/arrcomp5.input b/testdata/arrcomp5.jsonnet
similarity index 100%
rename from testdata/arrcomp5.input
rename to testdata/arrcomp5.jsonnet
diff --git a/testdata/arrcomp_if.input b/testdata/arrcomp_if.jsonnet
similarity index 100%
rename from testdata/arrcomp_if.input
rename to testdata/arrcomp_if.jsonnet
diff --git a/testdata/arrcomp_if2.input b/testdata/arrcomp_if2.jsonnet
similarity index 100%
rename from testdata/arrcomp_if2.input
rename to testdata/arrcomp_if2.jsonnet
diff --git a/testdata/arrcomp_if3.input b/testdata/arrcomp_if3.jsonnet
similarity index 100%
rename from testdata/arrcomp_if3.input
rename to testdata/arrcomp_if3.jsonnet
diff --git a/testdata/arrcomp_if4.input b/testdata/arrcomp_if4.jsonnet
similarity index 100%
rename from testdata/arrcomp_if4.input
rename to testdata/arrcomp_if4.jsonnet
diff --git a/testdata/arrcomp_if5.input b/testdata/arrcomp_if5.jsonnet
similarity index 100%
rename from testdata/arrcomp_if5.input
rename to testdata/arrcomp_if5.jsonnet
diff --git a/testdata/arrcomp_if6.input b/testdata/arrcomp_if6.jsonnet
similarity index 100%
rename from testdata/arrcomp_if6.input
rename to testdata/arrcomp_if6.jsonnet
diff --git a/testdata/arrcomp_if7.input b/testdata/arrcomp_if7.jsonnet
similarity index 100%
rename from testdata/arrcomp_if7.input
rename to testdata/arrcomp_if7.jsonnet
diff --git a/testdata/assert.input b/testdata/assert.jsonnet
similarity index 100%
rename from testdata/assert.input
rename to testdata/assert.jsonnet
diff --git a/testdata/assert2.input b/testdata/assert2.jsonnet
similarity index 100%
rename from testdata/assert2.input
rename to testdata/assert2.jsonnet
diff --git a/testdata/assert3.input b/testdata/assert3.jsonnet
similarity index 100%
rename from testdata/assert3.input
rename to testdata/assert3.jsonnet
diff --git a/testdata/assert_equal.input b/testdata/assert_equal.jsonnet
similarity index 100%
rename from testdata/assert_equal.input
rename to testdata/assert_equal.jsonnet
diff --git a/testdata/assert_equal2.input b/testdata/assert_equal2.jsonnet
similarity index 100%
rename from testdata/assert_equal2.input
rename to testdata/assert_equal2.jsonnet
diff --git a/testdata/assert_equal3.input b/testdata/assert_equal3.jsonnet
similarity index 100%
rename from testdata/assert_equal3.input
rename to testdata/assert_equal3.jsonnet
diff --git a/testdata/assert_equal4.input b/testdata/assert_equal4.jsonnet
similarity index 100%
rename from testdata/assert_equal4.input
rename to testdata/assert_equal4.jsonnet
diff --git a/testdata/assert_failed.input b/testdata/assert_failed.jsonnet
similarity index 100%
rename from testdata/assert_failed.input
rename to testdata/assert_failed.jsonnet
diff --git a/testdata/assert_failed_custom.input b/testdata/assert_failed_custom.jsonnet
similarity index 100%
rename from testdata/assert_failed_custom.input
rename to testdata/assert_failed_custom.jsonnet
diff --git a/testdata/binaryNot.input b/testdata/binaryNot.jsonnet
similarity index 100%
rename from testdata/binaryNot.input
rename to testdata/binaryNot.jsonnet
diff --git a/testdata/bitwise_and.input b/testdata/bitwise_and.jsonnet
similarity index 100%
rename from testdata/bitwise_and.input
rename to testdata/bitwise_and.jsonnet
diff --git a/testdata/bitwise_and2.input b/testdata/bitwise_and2.jsonnet
similarity index 100%
rename from testdata/bitwise_and2.input
rename to testdata/bitwise_and2.jsonnet
diff --git a/testdata/bitwise_and3.input b/testdata/bitwise_and3.jsonnet
similarity index 100%
rename from testdata/bitwise_and3.input
rename to testdata/bitwise_and3.jsonnet
diff --git a/testdata/bitwise_and4.input b/testdata/bitwise_and4.jsonnet
similarity index 100%
rename from testdata/bitwise_and4.input
rename to testdata/bitwise_and4.jsonnet
diff --git a/testdata/bitwise_and5.input b/testdata/bitwise_and5.jsonnet
similarity index 100%
rename from testdata/bitwise_and5.input
rename to testdata/bitwise_and5.jsonnet
diff --git a/testdata/bitwise_and6.input b/testdata/bitwise_and6.jsonnet
similarity index 100%
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rename to testdata/bitwise_and6.jsonnet
diff --git a/testdata/bitwise_or.input b/testdata/bitwise_or.jsonnet
similarity index 100%
rename from testdata/bitwise_or.input
rename to testdata/bitwise_or.jsonnet
diff --git a/testdata/bitwise_or2.input b/testdata/bitwise_or2.jsonnet
similarity index 100%
rename from testdata/bitwise_or2.input
rename to testdata/bitwise_or2.jsonnet
diff --git a/testdata/bitwise_or3.input b/testdata/bitwise_or3.jsonnet
similarity index 100%
rename from testdata/bitwise_or3.input
rename to testdata/bitwise_or3.jsonnet
diff --git a/testdata/bitwise_or4.input b/testdata/bitwise_or4.jsonnet
similarity index 100%
rename from testdata/bitwise_or4.input
rename to testdata/bitwise_or4.jsonnet
diff --git a/testdata/bitwise_or5.input b/testdata/bitwise_or5.jsonnet
similarity index 100%
rename from testdata/bitwise_or5.input
rename to testdata/bitwise_or5.jsonnet
diff --git a/testdata/bitwise_or6.input b/testdata/bitwise_or6.jsonnet
similarity index 100%
rename from testdata/bitwise_or6.input
rename to testdata/bitwise_or6.jsonnet
diff --git a/testdata/bitwise_or7.input b/testdata/bitwise_or7.jsonnet
similarity index 100%
rename from testdata/bitwise_or7.input
rename to testdata/bitwise_or7.jsonnet
diff --git a/testdata/bitwise_or8.input b/testdata/bitwise_or8.jsonnet
similarity index 100%
rename from testdata/bitwise_or8.input
rename to testdata/bitwise_or8.jsonnet
diff --git a/testdata/bitwise_or9.input b/testdata/bitwise_or9.jsonnet
similarity index 100%
rename from testdata/bitwise_or9.input
rename to testdata/bitwise_or9.jsonnet
diff --git a/testdata/bitwise_shift.input b/testdata/bitwise_shift.jsonnet
similarity index 100%
rename from testdata/bitwise_shift.input
rename to testdata/bitwise_shift.jsonnet
diff --git a/testdata/bitwise_shift2.input b/testdata/bitwise_shift2.jsonnet
similarity index 100%
rename from testdata/bitwise_shift2.input
rename to testdata/bitwise_shift2.jsonnet
diff --git a/testdata/bitwise_shift3.input b/testdata/bitwise_shift3.jsonnet
similarity index 100%
rename from testdata/bitwise_shift3.input
rename to testdata/bitwise_shift3.jsonnet
diff --git a/testdata/bitwise_shift4.input b/testdata/bitwise_shift4.jsonnet
similarity index 100%
rename from testdata/bitwise_shift4.input
rename to testdata/bitwise_shift4.jsonnet
diff --git a/testdata/bitwise_xor.input b/testdata/bitwise_xor.jsonnet
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rename to testdata/bitwise_xor.jsonnet
diff --git a/testdata/bitwise_xor2.input b/testdata/bitwise_xor2.jsonnet
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rename from testdata/bitwise_xor2.input
rename to testdata/bitwise_xor2.jsonnet
diff --git a/testdata/bitwise_xor3.input b/testdata/bitwise_xor3.jsonnet
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rename from testdata/bitwise_xor3.input
rename to testdata/bitwise_xor3.jsonnet
diff --git a/testdata/bitwise_xor4.input b/testdata/bitwise_xor4.jsonnet
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rename to testdata/bitwise_xor4.jsonnet
diff --git a/testdata/bitwise_xor5.input b/testdata/bitwise_xor5.jsonnet
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diff --git a/testdata/bitwise_xor6.input b/testdata/bitwise_xor6.jsonnet
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rename from testdata/bitwise_xor6.input
rename to testdata/bitwise_xor6.jsonnet
diff --git a/testdata/bitwise_xor7.input b/testdata/bitwise_xor7.jsonnet
similarity index 100%
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rename to testdata/bitwise_xor7.jsonnet
diff --git a/testdata/bitwise_xor8.input b/testdata/bitwise_xor8.jsonnet
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rename to testdata/bitwise_xor8.jsonnet
diff --git a/testdata/bitwise_xor9.input b/testdata/bitwise_xor9.jsonnet
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rename to testdata/bitwise_xor9.jsonnet
diff --git a/testdata/boolean_literal.input b/testdata/boolean_literal.jsonnet
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rename to testdata/boolean_literal.jsonnet
diff --git a/testdata/builtinChar.input b/testdata/builtinChar.jsonnet
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rename to testdata/builtinChar.jsonnet
diff --git a/testdata/builtinChar2.input b/testdata/builtinChar2.jsonnet
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rename to testdata/builtinChar2.jsonnet
diff --git a/testdata/builtinChar3.input b/testdata/builtinChar3.jsonnet
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rename to testdata/builtinChar3.jsonnet
diff --git a/testdata/builtinChar4.input b/testdata/builtinChar4.jsonnet
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diff --git a/testdata/builtinChar5.input b/testdata/builtinChar5.jsonnet
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diff --git a/testdata/builtinChar6.input b/testdata/builtinChar6.jsonnet
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diff --git a/testdata/builtinObjectFieldsEx.input b/testdata/builtinObjectFieldsEx.jsonnet
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rename from testdata/builtinObjectFieldsEx.input
rename to testdata/builtinObjectFieldsEx.jsonnet
diff --git a/testdata/builtinObjectFieldsExWithHidden.input b/testdata/builtinObjectFieldsExWithHidden.jsonnet
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rename to testdata/builtinObjectFieldsExWithHidden.jsonnet
diff --git a/testdata/builtinObjectHasEx.input b/testdata/builtinObjectHasEx.jsonnet
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rename to testdata/builtinObjectHasEx.jsonnet
diff --git a/testdata/builtinObjectHasExBadField.input b/testdata/builtinObjectHasExBadField.jsonnet
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rename to testdata/builtinObjectHasExBadField.jsonnet
diff --git a/testdata/builtinObjectHasExBadObject.input b/testdata/builtinObjectHasExBadObject.jsonnet
similarity index 100%
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rename to testdata/builtinObjectHasExBadObject.jsonnet
diff --git a/testdata/builtin_acos.input b/testdata/builtin_acos.jsonnet
similarity index 100%
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rename to testdata/builtin_acos.jsonnet
diff --git a/testdata/builtin_asin.input b/testdata/builtin_asin.jsonnet
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rename to testdata/builtin_asin.jsonnet
diff --git a/testdata/builtin_atan.input b/testdata/builtin_atan.jsonnet
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rename to testdata/builtin_atan.jsonnet
diff --git a/testdata/builtin_ceil.input b/testdata/builtin_ceil.jsonnet
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rename to testdata/builtin_ceil.jsonnet
diff --git a/testdata/builtin_cos.input b/testdata/builtin_cos.jsonnet
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rename to testdata/builtin_cos.jsonnet
diff --git a/testdata/builtin_exp.input b/testdata/builtin_exp.jsonnet
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rename to testdata/builtin_exp.jsonnet
diff --git a/testdata/builtin_floor.input b/testdata/builtin_floor.jsonnet
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rename to testdata/builtin_floor.jsonnet
diff --git a/testdata/builtin_log.input b/testdata/builtin_log.jsonnet
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rename to testdata/builtin_log.jsonnet
diff --git a/testdata/builtin_sin.input b/testdata/builtin_sin.jsonnet
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rename to testdata/builtin_sin.jsonnet
diff --git a/testdata/builtin_sqrt.input b/testdata/builtin_sqrt.jsonnet
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rename to testdata/builtin_sqrt.jsonnet
diff --git a/testdata/builtin_tan.input b/testdata/builtin_tan.jsonnet
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rename to testdata/builtin_tan.jsonnet
diff --git a/testdata/call_number.input b/testdata/call_number.jsonnet
similarity index 100%
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rename to testdata/call_number.jsonnet
diff --git a/testdata/div1.input b/testdata/div1.jsonnet
similarity index 100%
rename from testdata/div1.input
rename to testdata/div1.jsonnet
diff --git a/testdata/div2.input b/testdata/div2.jsonnet
similarity index 100%
rename from testdata/div2.input
rename to testdata/div2.jsonnet
diff --git a/testdata/div3.input b/testdata/div3.jsonnet
similarity index 100%
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rename to testdata/div3.jsonnet
diff --git a/testdata/div4.input b/testdata/div4.jsonnet
similarity index 100%
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rename to testdata/div4.jsonnet
diff --git a/testdata/div_by_zero.input b/testdata/div_by_zero.jsonnet
similarity index 100%
rename from testdata/div_by_zero.input
rename to testdata/div_by_zero.jsonnet
diff --git a/testdata/empty_array.input b/testdata/empty_array.jsonnet
similarity index 100%
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rename to testdata/empty_array.jsonnet
diff --git a/testdata/empty_object.input b/testdata/empty_object.jsonnet
similarity index 100%
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rename to testdata/empty_object.jsonnet
diff --git a/testdata/equals.input b/testdata/equals.jsonnet
similarity index 100%
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rename to testdata/equals.jsonnet
diff --git a/testdata/error.input b/testdata/error.jsonnet
similarity index 100%
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rename to testdata/error.jsonnet
diff --git a/testdata/error_hexnumber.input b/testdata/error_hexnumber.jsonnet
similarity index 100%
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rename to testdata/error_hexnumber.jsonnet
diff --git a/testdata/escaped_fields.input b/testdata/escaped_fields.jsonnet
similarity index 100%
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rename to testdata/escaped_fields.jsonnet
diff --git a/testdata/escaped_single_quote.input b/testdata/escaped_single_quote.jsonnet
similarity index 100%
rename from testdata/escaped_single_quote.input
rename to testdata/escaped_single_quote.jsonnet
diff --git a/testdata/false.golden b/testdata/false.golden
new file mode 100644
index 0000000..c508d53
--- /dev/null
+++ b/testdata/false.golden
@@ -0,0 +1 @@
+false
diff --git a/testdata/false.jsonnet b/testdata/false.jsonnet
new file mode 100644
index 0000000..c508d53
--- /dev/null
+++ b/testdata/false.jsonnet
@@ -0,0 +1 @@
+false
diff --git a/testdata/fieldname_not_string.input b/testdata/fieldname_not_string.jsonnet
similarity index 100%
rename from testdata/fieldname_not_string.input
rename to testdata/fieldname_not_string.jsonnet
diff --git a/testdata/filled_thunk.input b/testdata/filled_thunk.jsonnet
similarity index 100%
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rename to testdata/filled_thunk.jsonnet
diff --git a/testdata/function.input b/testdata/function.jsonnet
similarity index 100%
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rename to testdata/function.jsonnet
diff --git a/testdata/function_call.input b/testdata/function_call.jsonnet
similarity index 100%
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rename to testdata/function_call.jsonnet
diff --git a/testdata/function_capturing.input b/testdata/function_capturing.jsonnet
similarity index 100%
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rename to testdata/function_capturing.jsonnet
diff --git a/testdata/function_in_object.input b/testdata/function_in_object.jsonnet
similarity index 100%
rename from testdata/function_in_object.input
rename to testdata/function_in_object.jsonnet
diff --git a/testdata/function_with_argument.input b/testdata/function_with_argument.jsonnet
similarity index 100%
rename from testdata/function_with_argument.input
rename to testdata/function_with_argument.jsonnet
diff --git a/testdata/greater.input b/testdata/greater.jsonnet
similarity index 100%
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rename to testdata/greater.jsonnet
diff --git a/testdata/greaterEq.input b/testdata/greaterEq.jsonnet
similarity index 100%
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rename to testdata/greaterEq.jsonnet
diff --git a/testdata/greaterEq2.input b/testdata/greaterEq2.jsonnet
similarity index 100%
rename from testdata/greaterEq2.input
rename to testdata/greaterEq2.jsonnet
diff --git a/testdata/ifthen_false.input b/testdata/ifthen_false.jsonnet
similarity index 100%
rename from testdata/ifthen_false.input
rename to testdata/ifthen_false.jsonnet
diff --git a/testdata/ifthenelse_false.input b/testdata/ifthenelse_false.jsonnet
similarity index 100%
rename from testdata/ifthenelse_false.input
rename to testdata/ifthenelse_false.jsonnet
diff --git a/testdata/ifthenelse_true.input b/testdata/ifthenelse_true.jsonnet
similarity index 100%
rename from testdata/ifthenelse_true.input
rename to testdata/ifthenelse_true.jsonnet
diff --git a/testdata/import.golden b/testdata/import.golden
new file mode 100644
index 0000000..27ba77d
--- /dev/null
+++ b/testdata/import.golden
@@ -0,0 +1 @@
+true
diff --git a/testdata/import.jsonnet b/testdata/import.jsonnet
new file mode 100644
index 0000000..aca4aa2
--- /dev/null
+++ b/testdata/import.jsonnet
@@ -0,0 +1 @@
+import "true.jsonnet"
diff --git a/testdata/import2.golden b/testdata/import2.golden
new file mode 100644
index 0000000..c508d53
--- /dev/null
+++ b/testdata/import2.golden
@@ -0,0 +1 @@
+false
diff --git a/testdata/import2.jsonnet b/testdata/import2.jsonnet
new file mode 100644
index 0000000..f181054
--- /dev/null
+++ b/testdata/import2.jsonnet
@@ -0,0 +1 @@
+import "false.jsonnet"
diff --git a/testdata/import3.golden b/testdata/import3.golden
new file mode 100644
index 0000000..1d75bff
--- /dev/null
+++ b/testdata/import3.golden
@@ -0,0 +1 @@
+"true\n"
diff --git a/testdata/import3.jsonnet b/testdata/import3.jsonnet
new file mode 100644
index 0000000..9288534
--- /dev/null
+++ b/testdata/import3.jsonnet
@@ -0,0 +1 @@
+importstr "true.jsonnet"
diff --git a/testdata/import4.golden b/testdata/import4.golden
new file mode 100644
index 0000000..74f5ff2
--- /dev/null
+++ b/testdata/import4.golden
@@ -0,0 +1 @@
+"false\n"
diff --git a/testdata/import4.jsonnet b/testdata/import4.jsonnet
new file mode 100644
index 0000000..c1d21df
--- /dev/null
+++ b/testdata/import4.jsonnet
@@ -0,0 +1 @@
+importstr "false.jsonnet"
diff --git a/testdata/import_failure_directory.golden b/testdata/import_failure_directory.golden
new file mode 100644
index 0000000..b82d4f1
--- /dev/null
+++ b/testdata/import_failure_directory.golden
@@ -0,0 +1 @@
+RUNTIME ERROR: read testdata: is a directory
diff --git a/testdata/import_failure_directory.jsonnet b/testdata/import_failure_directory.jsonnet
new file mode 100644
index 0000000..172c063
--- /dev/null
+++ b/testdata/import_failure_directory.jsonnet
@@ -0,0 +1,3 @@
+// Test for the case when the imported thing exists, but there
+// is an error. In this case it's not even a file.
+import '.'
diff --git a/testdata/lazy.input b/testdata/lazy.jsonnet
similarity index 100%
rename from testdata/lazy.input
rename to testdata/lazy.jsonnet
diff --git a/testdata/lazy_operator1.input b/testdata/lazy_operator1.jsonnet
similarity index 100%
rename from testdata/lazy_operator1.input
rename to testdata/lazy_operator1.jsonnet
diff --git a/testdata/lazy_operator2.input b/testdata/lazy_operator2.jsonnet
similarity index 100%
rename from testdata/lazy_operator2.input
rename to testdata/lazy_operator2.jsonnet
diff --git a/testdata/less.input b/testdata/less.jsonnet
similarity index 100%
rename from testdata/less.input
rename to testdata/less.jsonnet
diff --git a/testdata/lessEq.input b/testdata/lessEq.jsonnet
similarity index 100%
rename from testdata/lessEq.input
rename to testdata/lessEq.jsonnet
diff --git a/testdata/lessEq2.input b/testdata/lessEq2.jsonnet
similarity index 100%
rename from testdata/lessEq2.input
rename to testdata/lessEq2.jsonnet
diff --git a/testdata/local_within_nested_object.input b/testdata/local_within_nested_object.jsonnet
similarity index 100%
rename from testdata/local_within_nested_object.input
rename to testdata/local_within_nested_object.jsonnet
diff --git a/testdata/method_call.input b/testdata/method_call.jsonnet
similarity index 100%
rename from testdata/method_call.input
rename to testdata/method_call.jsonnet
diff --git a/testdata/modulo.input b/testdata/modulo.jsonnet
similarity index 100%
rename from testdata/modulo.input
rename to testdata/modulo.jsonnet
diff --git a/testdata/modulo2.input b/testdata/modulo2.jsonnet
similarity index 100%
rename from testdata/modulo2.input
rename to testdata/modulo2.jsonnet
diff --git a/testdata/modulo3.input b/testdata/modulo3.jsonnet
similarity index 100%
rename from testdata/modulo3.input
rename to testdata/modulo3.jsonnet
diff --git a/testdata/modulo4.input b/testdata/modulo4.jsonnet
similarity index 100%
rename from testdata/modulo4.input
rename to testdata/modulo4.jsonnet
diff --git a/testdata/modulo5.input b/testdata/modulo5.jsonnet
similarity index 100%
rename from testdata/modulo5.input
rename to testdata/modulo5.jsonnet
diff --git a/testdata/modulo6.input b/testdata/modulo6.jsonnet
similarity index 100%
rename from testdata/modulo6.input
rename to testdata/modulo6.jsonnet
diff --git a/testdata/modulo7.input b/testdata/modulo7.jsonnet
similarity index 100%
rename from testdata/modulo7.input
rename to testdata/modulo7.jsonnet
diff --git a/testdata/mult.input b/testdata/mult.jsonnet
similarity index 100%
rename from testdata/mult.input
rename to testdata/mult.jsonnet
diff --git a/testdata/mult2.input b/testdata/mult2.jsonnet
similarity index 100%
rename from testdata/mult2.input
rename to testdata/mult2.jsonnet
diff --git a/testdata/mult3.input b/testdata/mult3.jsonnet
similarity index 100%
rename from testdata/mult3.input
rename to testdata/mult3.jsonnet
diff --git a/testdata/nonexistent_import.golden b/testdata/nonexistent_import.golden
new file mode 100644
index 0000000..5145a9d
--- /dev/null
+++ b/testdata/nonexistent_import.golden
@@ -0,0 +1 @@
+RUNTIME ERROR: Couldn't open import "no chance a file with this name exists": No match locally or in the Jsonnet library paths.
diff --git a/testdata/nonexistent_import.jsonnet b/testdata/nonexistent_import.jsonnet
new file mode 100644
index 0000000..99fefa3
--- /dev/null
+++ b/testdata/nonexistent_import.jsonnet
@@ -0,0 +1 @@
+importstr 'no chance a file with this name exists'
diff --git a/testdata/nonexistent_import_crazy.golden b/testdata/nonexistent_import_crazy.golden
new file mode 100644
index 0000000..709c9eb
--- /dev/null
+++ b/testdata/nonexistent_import_crazy.golden
@@ -0,0 +1 @@
+RUNTIME ERROR: Couldn't open import "ąęółńśćźż \\\" \\' \\n\\n\\t\\t": No match locally or in the Jsonnet library paths.
diff --git a/testdata/nonexistent_import_crazy.jsonnet b/testdata/nonexistent_import_crazy.jsonnet
new file mode 100644
index 0000000..fe6f680
--- /dev/null
+++ b/testdata/nonexistent_import_crazy.jsonnet
@@ -0,0 +1 @@
+importstr "ąęółńśćźż \" \' \n\n\t\t"
diff --git a/testdata/number_leading_zero.input b/testdata/number_leading_zero.jsonnet
similarity index 100%
rename from testdata/number_leading_zero.input
rename to testdata/number_leading_zero.jsonnet
diff --git a/testdata/numeric_literal.input b/testdata/numeric_literal.jsonnet
similarity index 100%
rename from testdata/numeric_literal.input
rename to testdata/numeric_literal.jsonnet
diff --git a/testdata/object.input b/testdata/object.jsonnet
similarity index 100%
rename from testdata/object.input
rename to testdata/object.jsonnet
diff --git a/testdata/object_sum.input b/testdata/object_sum.jsonnet
similarity index 100%
rename from testdata/object_sum.input
rename to testdata/object_sum.jsonnet
diff --git a/testdata/object_sum2.input b/testdata/object_sum2.jsonnet
similarity index 100%
rename from testdata/object_sum2.input
rename to testdata/object_sum2.jsonnet
diff --git a/testdata/object_sum3.input b/testdata/object_sum3.jsonnet
similarity index 100%
rename from testdata/object_sum3.input
rename to testdata/object_sum3.jsonnet
diff --git a/testdata/object_super.input b/testdata/object_super.jsonnet
similarity index 100%
rename from testdata/object_super.input
rename to testdata/object_super.jsonnet
diff --git a/testdata/object_super_deep.input b/testdata/object_super_deep.jsonnet
similarity index 100%
rename from testdata/object_super_deep.input
rename to testdata/object_super_deep.jsonnet
diff --git a/testdata/object_super_within.input b/testdata/object_super_within.jsonnet
similarity index 100%
rename from testdata/object_super_within.input
rename to testdata/object_super_within.jsonnet
diff --git a/testdata/object_within_object.input b/testdata/object_within_object.jsonnet
similarity index 100%
rename from testdata/object_within_object.input
rename to testdata/object_within_object.jsonnet
diff --git a/testdata/or.input b/testdata/or.jsonnet
similarity index 100%
rename from testdata/or.input
rename to testdata/or.jsonnet
diff --git a/testdata/or2.input b/testdata/or2.jsonnet
similarity index 100%
rename from testdata/or2.input
rename to testdata/or2.jsonnet
diff --git a/testdata/or3.input b/testdata/or3.jsonnet
similarity index 100%
rename from testdata/or3.input
rename to testdata/or3.jsonnet
diff --git a/testdata/or4.input b/testdata/or4.jsonnet
similarity index 100%
rename from testdata/or4.input
rename to testdata/or4.jsonnet
diff --git a/testdata/or5.input b/testdata/or5.jsonnet
similarity index 100%
rename from testdata/or5.input
rename to testdata/or5.jsonnet
diff --git a/testdata/or6.input b/testdata/or6.jsonnet
similarity index 100%
rename from testdata/or6.input
rename to testdata/or6.jsonnet
diff --git a/testdata/percent_bad.input b/testdata/percent_bad.jsonnet
similarity index 100%
rename from testdata/percent_bad.input
rename to testdata/percent_bad.jsonnet
diff --git a/testdata/percent_bad2.input b/testdata/percent_bad2.jsonnet
similarity index 100%
rename from testdata/percent_bad2.input
rename to testdata/percent_bad2.jsonnet
diff --git a/testdata/percent_bad3.input b/testdata/percent_bad3.jsonnet
similarity index 100%
rename from testdata/percent_bad3.input
rename to testdata/percent_bad3.jsonnet
diff --git a/testdata/percent_format_str.input b/testdata/percent_format_str.jsonnet
similarity index 100%
rename from testdata/percent_format_str.input
rename to testdata/percent_format_str.jsonnet
diff --git a/testdata/percent_format_str2.input b/testdata/percent_format_str2.jsonnet
similarity index 100%
rename from testdata/percent_format_str2.input
rename to testdata/percent_format_str2.jsonnet
diff --git a/testdata/percent_format_str3.input b/testdata/percent_format_str3.jsonnet
similarity index 100%
rename from testdata/percent_format_str3.input
rename to testdata/percent_format_str3.jsonnet
diff --git a/testdata/percent_format_str4.input b/testdata/percent_format_str4.jsonnet
similarity index 100%
rename from testdata/percent_format_str4.input
rename to testdata/percent_format_str4.jsonnet
diff --git a/testdata/percent_format_str5.input b/testdata/percent_format_str5.jsonnet
similarity index 100%
rename from testdata/percent_format_str5.input
rename to testdata/percent_format_str5.jsonnet
diff --git a/testdata/percent_format_str6.input b/testdata/percent_format_str6.jsonnet
similarity index 100%
rename from testdata/percent_format_str6.input
rename to testdata/percent_format_str6.jsonnet
diff --git a/testdata/percent_format_str7.input b/testdata/percent_format_str7.jsonnet
similarity index 100%
rename from testdata/percent_format_str7.input
rename to testdata/percent_format_str7.jsonnet
diff --git a/testdata/percent_format_str8.input b/testdata/percent_format_str8.jsonnet
similarity index 100%
rename from testdata/percent_format_str8.input
rename to testdata/percent_format_str8.jsonnet
diff --git a/testdata/percent_mod_int.input b/testdata/percent_mod_int.jsonnet
similarity index 100%
rename from testdata/percent_mod_int.input
rename to testdata/percent_mod_int.jsonnet
diff --git a/testdata/percent_mod_int2.input b/testdata/percent_mod_int2.jsonnet
similarity index 100%
rename from testdata/percent_mod_int2.input
rename to testdata/percent_mod_int2.jsonnet
diff --git a/testdata/percent_mod_int3.input b/testdata/percent_mod_int3.jsonnet
similarity index 100%
rename from testdata/percent_mod_int3.input
rename to testdata/percent_mod_int3.jsonnet
diff --git a/testdata/percent_mod_int4.input b/testdata/percent_mod_int4.jsonnet
similarity index 100%
rename from testdata/percent_mod_int4.input
rename to testdata/percent_mod_int4.jsonnet
diff --git a/testdata/percent_mod_int5.input b/testdata/percent_mod_int5.jsonnet
similarity index 100%
rename from testdata/percent_mod_int5.input
rename to testdata/percent_mod_int5.jsonnet
diff --git a/testdata/percent_mod_int6.input b/testdata/percent_mod_int6.jsonnet
similarity index 100%
rename from testdata/percent_mod_int6.input
rename to testdata/percent_mod_int6.jsonnet
diff --git a/testdata/plus.input b/testdata/plus.jsonnet
similarity index 100%
rename from testdata/plus.input
rename to testdata/plus.jsonnet
diff --git a/testdata/plus2.input b/testdata/plus2.jsonnet
similarity index 100%
rename from testdata/plus2.input
rename to testdata/plus2.jsonnet
diff --git a/testdata/plus3.input b/testdata/plus3.jsonnet
similarity index 100%
rename from testdata/plus3.input
rename to testdata/plus3.jsonnet
diff --git a/testdata/plus4.input b/testdata/plus4.jsonnet
similarity index 100%
rename from testdata/plus4.input
rename to testdata/plus4.jsonnet
diff --git a/testdata/plus5.input b/testdata/plus5.jsonnet
similarity index 100%
rename from testdata/plus5.input
rename to testdata/plus5.jsonnet
diff --git a/testdata/plus6.input b/testdata/plus6.jsonnet
similarity index 100%
rename from testdata/plus6.input
rename to testdata/plus6.jsonnet
diff --git a/testdata/plus7.input b/testdata/plus7.jsonnet
similarity index 100%
rename from testdata/plus7.input
rename to testdata/plus7.jsonnet
diff --git a/testdata/plus8.input b/testdata/plus8.jsonnet
similarity index 100%
rename from testdata/plus8.input
rename to testdata/plus8.jsonnet
diff --git a/testdata/plus9.input b/testdata/plus9.jsonnet
similarity index 100%
rename from testdata/plus9.input
rename to testdata/plus9.jsonnet
diff --git a/testdata/pow.input b/testdata/pow.jsonnet
similarity index 100%
rename from testdata/pow.input
rename to testdata/pow.jsonnet
diff --git a/testdata/pow2.input b/testdata/pow2.jsonnet
similarity index 100%
rename from testdata/pow2.input
rename to testdata/pow2.jsonnet
diff --git a/testdata/pow3.input b/testdata/pow3.jsonnet
similarity index 100%
rename from testdata/pow3.input
rename to testdata/pow3.jsonnet
diff --git a/testdata/pow4.input b/testdata/pow4.jsonnet
similarity index 100%
rename from testdata/pow4.input
rename to testdata/pow4.jsonnet
diff --git a/testdata/pow5.input b/testdata/pow5.jsonnet
similarity index 100%
rename from testdata/pow5.input
rename to testdata/pow5.jsonnet
diff --git a/testdata/pow6.input b/testdata/pow6.jsonnet
similarity index 100%
rename from testdata/pow6.input
rename to testdata/pow6.jsonnet
diff --git a/testdata/pow7.input b/testdata/pow7.jsonnet
similarity index 100%
rename from testdata/pow7.input
rename to testdata/pow7.jsonnet
diff --git a/testdata/recursive_local.input b/testdata/recursive_local.jsonnet
similarity index 100%
rename from testdata/recursive_local.input
rename to testdata/recursive_local.jsonnet
diff --git a/testdata/self.input b/testdata/self.jsonnet
similarity index 100%
rename from testdata/self.input
rename to testdata/self.jsonnet
diff --git a/testdata/simple_arith1.input b/testdata/simple_arith1.jsonnet
similarity index 100%
rename from testdata/simple_arith1.input
rename to testdata/simple_arith1.jsonnet
diff --git a/testdata/simple_arith2.input b/testdata/simple_arith2.jsonnet
similarity index 100%
rename from testdata/simple_arith2.input
rename to testdata/simple_arith2.jsonnet
diff --git a/testdata/simple_arith3.input b/testdata/simple_arith3.jsonnet
similarity index 100%
rename from testdata/simple_arith3.input
rename to testdata/simple_arith3.jsonnet
diff --git a/testdata/simple_arith_string.input b/testdata/simple_arith_string.jsonnet
similarity index 100%
rename from testdata/simple_arith_string.input
rename to testdata/simple_arith_string.jsonnet
diff --git a/testdata/simple_arith_string2.input b/testdata/simple_arith_string2.jsonnet
similarity index 100%
rename from testdata/simple_arith_string2.input
rename to testdata/simple_arith_string2.jsonnet
diff --git a/testdata/simple_arith_string3.input b/testdata/simple_arith_string3.jsonnet
similarity index 100%
rename from testdata/simple_arith_string3.input
rename to testdata/simple_arith_string3.jsonnet
diff --git a/testdata/simple_arith_string_empty.input b/testdata/simple_arith_string_empty.jsonnet
similarity index 100%
rename from testdata/simple_arith_string_empty.input
rename to testdata/simple_arith_string_empty.jsonnet
diff --git a/testdata/slice.input b/testdata/slice.jsonnet
similarity index 100%
rename from testdata/slice.input
rename to testdata/slice.jsonnet
diff --git a/testdata/slice2.input b/testdata/slice2.jsonnet
similarity index 100%
rename from testdata/slice2.input
rename to testdata/slice2.jsonnet
diff --git a/testdata/slice3.input b/testdata/slice3.jsonnet
similarity index 100%
rename from testdata/slice3.input
rename to testdata/slice3.jsonnet
diff --git a/testdata/slice4.input b/testdata/slice4.jsonnet
similarity index 100%
rename from testdata/slice4.input
rename to testdata/slice4.jsonnet
diff --git a/testdata/slice5.input b/testdata/slice5.jsonnet
similarity index 100%
rename from testdata/slice5.input
rename to testdata/slice5.jsonnet
diff --git a/testdata/slice6.input b/testdata/slice6.jsonnet
similarity index 100%
rename from testdata/slice6.input
rename to testdata/slice6.jsonnet
diff --git a/testdata/slice7.input b/testdata/slice7.jsonnet
similarity index 100%
rename from testdata/slice7.input
rename to testdata/slice7.jsonnet
diff --git a/testdata/std.codepoint.input b/testdata/std.codepoint.jsonnet
similarity index 100%
rename from testdata/std.codepoint.input
rename to testdata/std.codepoint.jsonnet
diff --git a/testdata/std.codepoint2.input b/testdata/std.codepoint2.jsonnet
similarity index 100%
rename from testdata/std.codepoint2.input
rename to testdata/std.codepoint2.jsonnet
diff --git a/testdata/std.codepoint3.input b/testdata/std.codepoint3.jsonnet
similarity index 100%
rename from testdata/std.codepoint3.input
rename to testdata/std.codepoint3.jsonnet
diff --git a/testdata/std.codepoint4.input b/testdata/std.codepoint4.jsonnet
similarity index 100%
rename from testdata/std.codepoint4.input
rename to testdata/std.codepoint4.jsonnet
diff --git a/testdata/std.codepoint5.input b/testdata/std.codepoint5.jsonnet
similarity index 100%
rename from testdata/std.codepoint5.input
rename to testdata/std.codepoint5.jsonnet
diff --git a/testdata/std.codepoint6.input b/testdata/std.codepoint6.jsonnet
similarity index 100%
rename from testdata/std.codepoint6.input
rename to testdata/std.codepoint6.jsonnet
diff --git a/testdata/std.codepoint7.input b/testdata/std.codepoint7.jsonnet
similarity index 100%
rename from testdata/std.codepoint7.input
rename to testdata/std.codepoint7.jsonnet
diff --git a/testdata/std.exponent.input b/testdata/std.exponent.jsonnet
similarity index 100%
rename from testdata/std.exponent.input
rename to testdata/std.exponent.jsonnet
diff --git a/testdata/std.exponent2.input b/testdata/std.exponent2.jsonnet
similarity index 100%
rename from testdata/std.exponent2.input
rename to testdata/std.exponent2.jsonnet
diff --git a/testdata/std.exponent3.input b/testdata/std.exponent3.jsonnet
similarity index 100%
rename from testdata/std.exponent3.input
rename to testdata/std.exponent3.jsonnet
diff --git a/testdata/std.exponent4.input b/testdata/std.exponent4.jsonnet
similarity index 100%
rename from testdata/std.exponent4.input
rename to testdata/std.exponent4.jsonnet
diff --git a/testdata/std.exponent5.input b/testdata/std.exponent5.jsonnet
similarity index 100%
rename from testdata/std.exponent5.input
rename to testdata/std.exponent5.jsonnet
diff --git a/testdata/std.exponent6.input b/testdata/std.exponent6.jsonnet
similarity index 100%
rename from testdata/std.exponent6.input
rename to testdata/std.exponent6.jsonnet
diff --git a/testdata/std.exponent7.input b/testdata/std.exponent7.jsonnet
similarity index 100%
rename from testdata/std.exponent7.input
rename to testdata/std.exponent7.jsonnet
diff --git a/testdata/std.filter.input b/testdata/std.filter.jsonnet
similarity index 100%
rename from testdata/std.filter.input
rename to testdata/std.filter.jsonnet
diff --git a/testdata/std.filter2.input b/testdata/std.filter2.jsonnet
similarity index 100%
rename from testdata/std.filter2.input
rename to testdata/std.filter2.jsonnet
diff --git a/testdata/std.filter3.input b/testdata/std.filter3.jsonnet
similarity index 100%
rename from testdata/std.filter3.input
rename to testdata/std.filter3.jsonnet
diff --git a/testdata/std.filter4.input b/testdata/std.filter4.jsonnet
similarity index 100%
rename from testdata/std.filter4.input
rename to testdata/std.filter4.jsonnet
diff --git a/testdata/std.filter5.input b/testdata/std.filter5.jsonnet
similarity index 100%
rename from testdata/std.filter5.input
rename to testdata/std.filter5.jsonnet
diff --git a/testdata/std.filter6.input b/testdata/std.filter6.jsonnet
similarity index 100%
rename from testdata/std.filter6.input
rename to testdata/std.filter6.jsonnet
diff --git a/testdata/std.filter7.input b/testdata/std.filter7.jsonnet
similarity index 100%
rename from testdata/std.filter7.input
rename to testdata/std.filter7.jsonnet
diff --git a/testdata/std.filter_swapped_args.input b/testdata/std.filter_swapped_args.jsonnet
similarity index 100%
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