diff --git a/test/controllers/misc_controller_test.rb b/test/controllers/misc_controller_test.rb
new file mode 100644
index 0000000..48b7440
--- /dev/null
+++ b/test/controllers/misc_controller_test.rb
@@ -0,0 +1,70 @@
+require "test_helper"
+
+class MiscControllerTest < ActionDispatch::IntegrationTest
+  class DummyAgent
+    def log
+      Struct.new(:read).new(read: "dummy_log_content")
+    end
+
+    def version
+      "dummy version"
+    end
+  end
+
+  setup do
+    @fluentd = FactoryBot.build(:fluentd, log_file: "dummy.log")
+    @agent = DummyAgent.new
+    @fluentd_log_content = @agent.log.read
+    @fluentd_version = @agent.version
+    @fluentd_ui_log_content = <<-LOG.strip_heredoc
+    log1
+    log2
+    log3
+    LOG
+
+    @dummy_log_path = "tmp/dummy.log"
+    @destination_dir = Rails.root.join("tmp/system_info")
+
+    user = FactoryBot.build(:user)
+    post(sessions_path(session: { name: user.name, password: user.password }))
+    any_instance_of(MiscController) do |object|
+      stub(object).log_path { @dummy_log_path }
+    end
+
+    File.write(@dummy_log_path, @fluentd_ui_log_content)
+    stub(@fluentd).agent { @agent }
+    stub(Fluentd).instance { @fluentd }
+  end
+
+  sub_test_case "download info" do
+    setup do
+      get(misc_download_info_path)
+      #expand files in zip
+      Zip::File.open(Rails.root.join("tmp/system_info.zip")) do |zip_file|
+        FileUtils.mkdir_p(@destination_dir)
+
+        zip_file.each do |entry|
+          destination = File.join(@destination_dir, entry.name)
+          zip_file.extract(entry, destination) unless File.exist?(destination)
+        end
+      end
+    end
+
+    teardown do
+      FileUtils.rm_rf(Rails.root.join("tmp/system_info.zip"))
+      FileUtils.rm_rf(@destination_dir)
+      FileUtils.rm_rf("tmp/dummy.log")
+    end
+
+    def content_of(name)
+      File.read(File.join(@destination_dir, name))
+    end
+
+    test "write files" do
+      assert_equal("#{@fluentd_log_content}\n", content_of("fluentd.log"))
+      assert_equal("#{@fluentd_ui_log_content}", content_of("fluentd-ui.log"))
+      assert_match("RAILS_ENV=test", content_of("env.txt"))
+      assert_match("fluentd: #{@fluentd_version}", content_of("versions.txt"))
+    end
+  end
+end