Make SassLangTestsBroken pass iff the CSS and SCSS do not match.

This makes builds pass, and gives a clearer message if one of the
previously broken tests have been fixed.

Change-Id: I6e5b2d9771615abbcb611f28d50ebdefcaa01ae2

theme-compiler/tests/src/com/vaadin/sass/testcases/scss/SassLangTestsBroken.java

@@ -19,7 +19,9 @@ import java.net.URISyntaxException;
 import java.net.URL;
 import java.util.Collection;
 
+import org.junit.Assert;
 import org.junit.runner.RunWith;
+import org.w3c.css.sac.CSSException;
 
 import com.vaadin.sass.testcases.scss.SassTestRunner.TestFactory;
 
@@ -47,4 +49,22 @@ public class SassLangTestsBroken extends AbstractDirectoryScanningSassTests {
         return getScssResourceNames(getResourceURLInternal(""));
     }
 
+    @Override
+    public void compareScssWithCss(String scssResourceName) throws Exception {
+        boolean success = false;
+        try {
+            super.compareScssWithCss(scssResourceName);
+            success = true;
+        } catch (CSSException e) {
+            // this is an expected outcome
+        } catch (AssertionError e) {
+            // this is an expected outcome
+        }
+        if (success) {
+            Assert.fail("Test "
+                    + scssResourceName
+                    + " from sasslangbroken that was expected to fail has been fixed. Please move the corresponding CSS and SCSS files to sasslang.");
+        }
+    }
+
 }