Fixes tests under Windows. (#40)

core/src/test/java/com/google/googlejavaformat/java/DiagnosticTest.java

diff --git a/core/src/test/java/com/google/googlejavaformat/java/DiagnosticTest.java b/core/src/test/java/com/google/googlejavaformat/java/DiagnosticTest.java
index 13d1c73..31da7e9 100644
--- a/core/src/test/java/com/google/googlejavaformat/java/DiagnosticTest.java
+++ b/core/src/test/java/com/google/googlejavaformat/java/DiagnosticTest.java
@@ -112,7 +112,7 @@
     assertThat(stderr.toString()).contains("One.java:1:11: error: Syntax error, insert \"}\"");
     assertThat(result).isEqualTo(1);
   }
-  
+
   @Test
   public void oneFileParseErrorReplace() throws Exception {
     String one = "class One {}}\n";
@@ -171,7 +171,7 @@
 
     assertThat(exitCode).isEqualTo(1);
     assertThat(err.toString())
-        .isEqualTo("<stdin>:2:4: error: Syntax error, insert \";\" to complete BlockStatements\n");
+        .contains("<stdin>:2:4: error: Syntax error, insert \";\" to complete BlockStatements");
   }
 
   @Test
@@ -204,6 +204,6 @@
     int exitCode = main.format(args);
 
     assertThat(exitCode).isEqualTo(1);
-    assertThat(err.toString()).isEqualTo("<stdin>:2:4: error: Invalid character constant\n");
+    assertThat(err.toString()).contains("<stdin>:2:4: error: Invalid character constant");
   }
 }