diff --git a/cmd/promtool/unittest.go b/cmd/promtool/unittest.go
index 295ace2d74..9d72bd39a2 100644
--- a/cmd/promtool/unittest.go
+++ b/cmd/promtool/unittest.go
@@ -25,6 +25,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/go-kit/kit/log"
 	"github.com/pkg/errors"
 	yaml "gopkg.in/yaml.v2"
 
@@ -160,7 +161,7 @@ func (tg *testGroup) test(mint, maxt time.Time, evalInterval time.Duration, grou
 		Appendable: suite.Storage(),
 		Context:    context.Background(),
 		NotifyFunc: func(ctx context.Context, expr string, alerts ...*rules.Alert) {},
-		Logger:     &dummyLogger{},
+		Logger:     log.NewNopLogger(),
 	}
 	m := rules.NewManager(opts)
 	// TODO(beorn7): Provide a way to pass in external labels.
@@ -502,9 +503,3 @@ func parsedSamplesString(pss []parsedSample) string {
 func (ps *parsedSample) String() string {
 	return ps.Labels.String() + " " + strconv.FormatFloat(ps.Value, 'E', -1, 64)
 }
-
-type dummyLogger struct{}
-
-func (l *dummyLogger) Log(keyvals ...interface{}) error {
-	return nil
-}
diff --git a/docs/configuration/unit_testing_rules.md b/docs/configuration/unit_testing_rules.md
index f767d85891..3bacc7cff6 100644
--- a/docs/configuration/unit_testing_rules.md
+++ b/docs/configuration/unit_testing_rules.md
@@ -25,8 +25,8 @@ rule_files:
 # optional, default = 1m
 evaluation_interval: <duration>
 
-# The order in which group names are listed below will be the order of evaluation of 
-# rule groups (at a given evaluation time). The order is guaranteed only for the groups mentioned below. 
+# The order in which group names are listed below will be the order of evaluation of
+# rule groups (at a given evaluation time). The order is guaranteed only for the groups mentioned below.
 # All the groups need not be mentioned below.
 group_eval_order:
   [ - <group_name> ]
@@ -59,13 +59,13 @@ promql_expr_test:
 
 ```yaml
 # This follows the usual series notation '<metric name>{<label name>=<label value>, ...}'
-# Examples: 
+# Examples:
 #      series_name{label1="value1", label2="value2"}
 #      go_goroutines{job="prometheus", instance="localhost:9090"}
 series: <string>
 
 # This uses expanding notation.
-# Expanding notation: 
+# Expanding notation:
 #     'a+bxc' becomes 'a a+b a+(2*b) a+(3*b) … a+(c*b)'
 #     'a-bxc' becomes 'a a-b a-(2*b) a-(3*b) … a-(c*b)'
 # Examples:
@@ -85,8 +85,8 @@ eval_time: <duration>
 # Name of the alert to be tested.
 alertname: <string>
 
-# List of expected alerts which are firing under the given alertname at 
-# given evaluation time. If you want to test if an alerting rule should 
+# List of expected alerts which are firing under the given alertname at
+# given evaluation time. If you want to test if an alerting rule should
 # not be firing, then you can mention the above fields and leave 'exp_alerts' empty.
 exp_alerts:
   [ - <alert> ]
@@ -95,8 +95,8 @@ exp_alerts:
 ### `<alert>`
 
 ``` yaml
-# These are the expanded labels and annotations of the expected alert. 
-# Note: labels also include the labels of the sample associated with the 
+# These are the expanded labels and annotations of the expected alert.
+# Note: labels also include the labels of the sample associated with the
 # alert (same as what you see in `/alerts`, without series `__name__` and `alertname`)
 exp_labels:
   [ <labelname>: <string> ]
@@ -122,7 +122,7 @@ exp_samples:
 
 ```yaml
 # Labels of the sample in usual series notation '<metric name>{<label name>=<label value>, ...}'
-# Examples: 
+# Examples:
 #      series_name{label1="value1", label2="value2"}
 #      go_goroutines{job="prometheus", instance="localhost:9090"}
 labels: <string>
@@ -131,7 +131,7 @@ labels: <string>
 value: <number>
 ```
 
-## Example 
+## Example
 
 This is an example input file for unit testing which passes the test. `test.yml` is the test file which follows the syntax above and `alerts.yml` contains the alerting rules.
 
@@ -140,7 +140,7 @@ With `alerts.yml` in the same directory, run `./promtool test rules test.yml`.
 ### `test.yml`
 
 ```yaml
-# This is the main input for unit testing. 
+# This is the main input for unit testing.
 # Only this file is passed as command line argument.
 
 rule_files: