Don't check trailing spaces because idea removes them by default

compiler/tests/org/jetbrains/jet/JetTestUtils.java

@@ -69,6 +69,7 @@ import org.jetbrains.jet.lexer.JetTokens;
 import org.jetbrains.jet.plugin.JetLanguage;
 import org.jetbrains.jet.test.InnerTestClasses;
 import org.jetbrains.jet.test.TestMetadata;
+import org.jetbrains.jet.test.util.UtilPackage;
 import org.jetbrains.jet.util.slicedmap.ReadOnlySlice;
 import org.jetbrains.jet.util.slicedmap.SlicedMap;
 import org.jetbrains.jet.util.slicedmap.WritableSlice;
@@ -437,9 +438,11 @@ public class JetTestUtils {
             }
             String expected = FileUtil.loadFile(expectedFile, CharsetToolkit.UTF8, true);
 
-            // compare with hard copy: make sure nothing is lost in output
-            String expectedText = StringUtil.convertLineSeparators(expected.trim());
-            String actualText = StringUtil.convertLineSeparators(actual.trim());
+            String expectedText = UtilPackage.removeTrailingWhitespacesFromEachLine(
+                    StringUtil.convertLineSeparators(expected.trim()));
+            String actualText = UtilPackage.removeTrailingWhitespacesFromEachLine(
+                    StringUtil.convertLineSeparators(actual.trim()));
+
             if (!Comparing.equal(expectedText, actualText)) {
                 throw new FileComparisonFailure("Actual data differs from file content: " + expectedFile.getName(),
                                                 expected, actual, expectedFile.getAbsolutePath());

compiler/tests/org/jetbrains/jet/jetTestUtils.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2014 JetBrains s.r.o.
+ *
+ * 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 org.jetbrains.jet.test.util
+
+fun String.removeTrailingWhitespacesFromEachLine() = split('\n') map { it.trimTrailing() } makeString ("\n")