diff --git a/tests/compiler/dart2js/codegen/string_escapes_test.dart b/tests/compiler/dart2js/codegen/string_escapes_test.dart
index 16d469d418a..9e774d2a15a 100644
--- a/tests/compiler/dart2js/codegen/string_escapes_test.dart
+++ b/tests/compiler/dart2js/codegen/string_escapes_test.dart
@@ -18,15 +18,15 @@ main() {
 
     await compileExpression("''' \n\r\u2028\u2029'''").then((String generated) {
       Expect.isTrue(
-          generated.contains(r'"\r\u2028\u2029"') ||
-              generated.contains(r"'\r\u2028\u2029'"),
+          generated.contains(r'"\n\u2028\u2029"') ||
+              generated.contains(r"'\n\u2028\u2029'"),
           generated);
     });
     await compileExpression("r''' \n\r\u2028\u2029'''")
         .then((String generated) {
       Expect.isTrue(
-          generated.contains(r'"\r\u2028\u2029"') ||
-              generated.contains(r"'\r\u2028\u2029'"),
+          generated.contains(r'"\n\u2028\u2029"') ||
+              generated.contains(r"'\n\u2028\u2029'"),
           generated);
     });
     await compileExpression("r''' \r\n\u2028\u2029'''")
@@ -52,24 +52,24 @@ main() {
             "r'''\t\t      \t\t  \t\t  \t \t \n\r\u2028\u2029'''")
         .then((String generated) {
       Expect.isTrue(
-          generated.contains(r'"\r\u2028\u2029"') ||
-              generated.contains(r"'\r\u2028\u2029'"),
+          generated.contains(r'"\n\u2028\u2029"') ||
+              generated.contains(r"'\n\u2028\u2029'"),
           generated);
     });
     await compileExpression(
             "r'''\\\t\\\t \\   \\  \t\\\t  \t \\\n\r\u2028\u2029'''")
         .then((String generated) {
       Expect.isTrue(
-          generated.contains(r'"\r\u2028\u2029"') ||
-              generated.contains(r"'\r\u2028\u2029'"),
+          generated.contains(r'"\n\u2028\u2029"') ||
+              generated.contains(r"'\n\u2028\u2029'"),
           generated);
     });
     await compileExpression(
             "r'''\t\t      \t\t  \t\t  \t \t \\\n\r\u2028\u2029'''")
         .then((String generated) {
       Expect.isTrue(
-          generated.contains(r'"\r\u2028\u2029"') ||
-              generated.contains(r"'\r\u2028\u2029'"),
+          generated.contains(r'"\n\u2028\u2029"') ||
+              generated.contains(r"'\n\u2028\u2029'"),
           generated);
     });
     await compileExpression(
diff --git a/tests/compiler/dart2js/helpers/memory_source_file_helper.dart b/tests/compiler/dart2js/helpers/memory_source_file_helper.dart
index b1e0be0f93e..6c3baf49e29 100644
--- a/tests/compiler/dart2js/helpers/memory_source_file_helper.dart
+++ b/tests/compiler/dart2js/helpers/memory_source_file_helper.dart
@@ -43,20 +43,19 @@ class MemorySourceFileProvider extends SourceFileProvider {
           'No such memory file $resourceUri in ${memorySourceFiles.keys}'));
     }
     Input<List<int>> input;
+    StringSourceFile stringFile;
+    if (source is String) {
+      stringFile = new StringSourceFile.fromUri(resourceUri, source);
+    }
     switch (inputKind) {
       case InputKind.UTF8:
-        if (source is String) {
-          input = new StringSourceFile.fromUri(resourceUri, source);
-        } else {
-          input = new Utf8BytesSourceFile(resourceUri, source);
-        }
+        input = stringFile ?? new Utf8BytesSourceFile(resourceUri, source);
         utf8SourceFiles[resourceUri] = input;
         break;
       case InputKind.binary:
-        if (source is String) {
-          utf8SourceFiles[resourceUri] =
-              new StringSourceFile.fromUri(resourceUri, source);
-          source = source.codeUnits;
+        if (stringFile != null) {
+          utf8SourceFiles[resourceUri] = stringFile;
+          source = stringFile.data;
         }
         input =
             binarySourceFiles[resourceUri] = new Binary(resourceUri, source);