Diagnostic tests are logging their lazy activity

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

@@ -41,6 +41,7 @@ import com.intellij.util.Function;
 import com.intellij.util.Processor;
 import com.intellij.util.containers.ContainerUtil;
 import junit.framework.TestCase;
+import kotlin.Function1;
 import kotlin.KotlinPackage;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
@@ -438,6 +439,15 @@ public class JetTestUtils {
     }
 
     public static void assertEqualsToFile(@NotNull File expectedFile, @NotNull String actual) {
+        assertEqualsToFile(expectedFile, actual, new Function1<String, String>() {
+            @Override
+            public String invoke(String s) {
+                return s;
+            }
+        });
+    }
+
+    public static void assertEqualsToFile(@NotNull File expectedFile, @NotNull String actual, @NotNull Function1<String, String> sanitizer) {
         try {
             String actualText = UtilPackage.trimTrailingWhitespacesAndAddNewlineAtEOF(StringUtil.convertLineSeparators(actual.trim()));
 
@@ -449,7 +459,7 @@ public class JetTestUtils {
 
             String expectedText = UtilPackage.trimTrailingWhitespacesAndAddNewlineAtEOF(StringUtil.convertLineSeparators(expected.trim()));
 
-            if (!Comparing.equal(expectedText, actualText)) {
+            if (!Comparing.equal(sanitizer.invoke(expectedText), sanitizer.invoke(actualText))) {
                 throw new FileComparisonFailure("Actual data differs from file content: " + expectedFile.getName(),
                                                 expected, actual, expectedFile.getAbsolutePath());
             }