junit patterns: accept whitespaces in hamcrest matchers (IDEA-205843)

plugins/junit/test/com/intellij/execution/junit/JUnitExpectedPatternsTest.java

@@ -41,7 +41,7 @@ public class JUnitExpectedPatternsTest {
   public void testHamcrestAssertThatWithReason() {
     Assert.assertNotNull(createNotification("reason\n" +
                                             "Expected: is \"aaa\\naa\"\n" +
-                                            "     but: was \"bbb\\nbb\""));
+                                            "     but:    was \"bbb\\nbb\""));
   }
 
   @Test

plugins/junit_rt/src/com/intellij/junit4/ExpectedPatterns.java

@@ -26,7 +26,7 @@ public class ExpectedPatterns extends AbstractExpectedPatterns {
   
   private static final String[] PATTERN_STRINGS = new String[]{
     "\nexpected: is \"(.*)\"\n\\s*got: \"(.*)\"\n",
-    "\nexpected: is \"(.*)\"\n\\s*but: was \"(.*)\"",
+    "\nexpected: is \"(.*)\"\n\\s*but:\\s*was \"(.*)\"",
     "\nexpected: (.*)\n\\s*got: (.*)",
     "expected same:<(.*)> was not:<(.*)>",
     "\nexpected: \"(.*)\"\n\\s*but: was \"(.*)\"",