diff --git a/ui/build/util_test.go b/ui/build/util_test.go
new file mode 100644
index 0000000..e85eada
--- /dev/null
+++ b/ui/build/util_test.go
@@ -0,0 +1,62 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package build
+
+import "testing"
+
+func TestStripAnsiEscapes(t *testing.T) {
+	testcases := []struct {
+		input  string
+		output string
+	}{
+		{
+			"",
+			"",
+		},
+		{
+			"This is a test",
+			"This is a test",
+		},
+		{
+			"interrupted: \x1b[12",
+			"interrupted: ",
+		},
+		{
+			"other \x1bescape \x1b",
+			"other \x1bescape \x1b",
+		},
+		{ // from pretty-error macro
+			"\x1b[1mart/Android.mk: \x1b[31merror:\x1b[0m\x1b[1m art: test error \x1b[0m",
+			"art/Android.mk: error: art: test error ",
+		},
+		{ // from envsetup.sh make wrapper
+			"\x1b[0;31m#### make failed to build some targets (2 seconds) ####\x1b[00m",
+			"#### make failed to build some targets (2 seconds) ####",
+		},
+		{ // from clang (via ninja testcase)
+			"\x1b[1maffixmgr.cxx:286:15: \x1b[0m\x1b[0;1;35mwarning: \x1b[0m\x1b[1musing the result... [-Wparentheses]\x1b[0m",
+			"affixmgr.cxx:286:15: warning: using the result... [-Wparentheses]",
+		},
+	}
+	for _, tc := range testcases {
+		got := string(stripAnsiEscapes([]byte(tc.input)))
+		if got != tc.output {
+			t.Errorf("output strings didn't match\n"+
+				"input: %#v\n"+
+				" want: %#v\n"+
+				"  got: %#v", tc.input, tc.output, got)
+		}
+	}
+}