adapting test for new output format

Author: simschla

plugin-maven/src/test/java/com/diffplug/spotless/maven/prettier/PrettierFormatStepTest.java

@@ -19,13 +19,13 @@
 
 import java.io.IOException;
 
-import com.diffplug.spotless.maven.generic.Prettier;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
 import com.diffplug.spotless.category.NpmTest;
 import com.diffplug.spotless.maven.MavenIntegrationHarness;
 import com.diffplug.spotless.maven.MavenRunner;
+import com.diffplug.spotless.maven.generic.Prettier;
 
 @Category(NpmTest.class)
 public class PrettierFormatStepTest extends MavenIntegrationHarness {

testlib/src/test/java/com/diffplug/spotless/npm/PrettierFormatterStepTest.java

@@ -97,7 +97,7 @@ public void recreate500InternalServerError() throws Exception {
 					new PrettierConfig(null, ImmutableMap.of("parser", "postcss")));
 			try (StepHarness stepHarness = StepHarness.forStep(formatterStep)) {
 				stepHarness.testException("npm/prettier/filetypes/scss/causes500error.dirty", exception -> {
-					exception.hasMessageStartingWith("500: Internal Server Error");
+					exception.hasMessageContaining("HTTP 501");
 				});
 			}
 		}