diff --git a/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/AssertionsAuditListener.java b/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/AssertionsAuditListener.java
index 22ef790d..92105e06 100644
--- a/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/AssertionsAuditListener.java
+++ b/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/AssertionsAuditListener.java
@@ -75,10 +75,10 @@ public void auditFinished(AuditEvent event) {
 	private void runCheck(String check) {
 		String description = this.filenames.toString();
 		if (check.startsWith("+")) {
-			assertThat(this.message).as(description).contains(check.substring(1));
+			assertThat(this.message.toString()).as(description).contains(check.substring(1));
 		}
 		else if (check.startsWith("-")) {
-			assertThat(this.message).as(description).doesNotContain(check.substring(1));
+			assertThat(this.message.toString()).as(description).doesNotContain(check.substring(1));
 		}
 	}
 
diff --git a/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/SpringChecksTests.java b/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/SpringChecksTests.java
index 6e4b72be..692d2134 100644
--- a/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/SpringChecksTests.java
+++ b/spring-javaformat/spring-javaformat-checkstyle/src/test/java/io/spring/javaformat/checkstyle/SpringChecksTests.java
@@ -24,6 +24,7 @@
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
+import java.util.Locale;
 import java.util.Properties;
 import java.util.stream.Collectors;
 
@@ -71,6 +72,8 @@ public SpringChecksTests(Parameter parameter) throws Exception {
 
 	@Test
 	public void processHasExpectedResults() throws Exception {
+		Locale previousLocale = Locale.getDefault();
+		Locale.setDefault(Locale.ENGLISH);
 		Configuration configuration = loadConfiguration();
 		RootModule rootModule = createRootModule(configuration);
 		try {
@@ -78,6 +81,7 @@ public void processHasExpectedResults() throws Exception {
 		}
 		finally {
 			rootModule.destroy();
+			Locale.setDefault(previousLocale);
 		}
 	}
 
@@ -100,7 +104,7 @@ private RootModule createRootModule(Configuration configuration) throws Checksty
 	}
 
 	private void processAndCheckResults(RootModule rootModule) throws CheckstyleException {
-		rootModule.addListener(this.parameter.getAssersionsListener());
+		rootModule.addListener(this.parameter.getAssertionsListener());
 		if (!RUNNING_ON_WINDOWS) {
 			printDebugInfo(this.parameter.getSourceFile());
 		}
@@ -127,7 +131,7 @@ private static class Parameter {
 
 		private final File sourceFile;
 
-		private final AssertionsAuditListener assersionsListener;
+		private final AssertionsAuditListener assertionsListener;
 
 		private final File configFile;
 
@@ -136,7 +140,7 @@ private static class Parameter {
 			this.sourceFile = new File(SOURCES_DIR, sourceName);
 			File configFile = new File(CONFIGS_DIR, this.name + ".xml");
 			this.configFile = (configFile.exists() ? configFile : DEFAULT_CONFIG);
-			this.assersionsListener = new AssertionsAuditListener(readChecks(this.name + ".txt"));
+			this.assertionsListener = new AssertionsAuditListener(readChecks(this.name + ".txt"));
 		}
 
 		private List<String> readChecks(String name) {
@@ -156,8 +160,8 @@ public File getConfigFile() {
 			return this.configFile;
 		}
 
-		public AssertionsAuditListener getAssersionsListener() {
-			return this.assersionsListener;
+		public AssertionsAuditListener getAssertionsListener() {
+			return this.assertionsListener;
 		}
 
 		@Override
diff --git a/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/OuterTypeFilenameInvalid.txt b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/OuterTypeFilenameInvalid.txt
new file mode 100644
index 00000000..c242222d
--- /dev/null
+++ b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/OuterTypeFilenameInvalid.txt
@@ -0,0 +1 @@
++The name of the outer type and the file do not match
\ No newline at end of file
diff --git a/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/OuterTypeFilenameValid.txt b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/OuterTypeFilenameValid.txt
new file mode 100644
index 00000000..69174e4c
--- /dev/null
+++ b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/check/OuterTypeFilenameValid.txt
@@ -0,0 +1 @@
++0 errors
\ No newline at end of file
diff --git a/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/NewlineAtEndOfFile.java b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/NewlineAtEndOfFile.java
index e4af2c7a..2e80c229 100644
--- a/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/NewlineAtEndOfFile.java
+++ b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/NewlineAtEndOfFile.java
@@ -14,6 +14,6 @@
  * limitations under the License.
  */
 
-public class MissingNewLine {
+public class NewlineAtEndOfFile {
 
 }
\ No newline at end of file
diff --git a/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/OuterTypeFilenameInvalid.java b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/OuterTypeFilenameInvalid.java
new file mode 100644
index 00000000..0c2f80ad
--- /dev/null
+++ b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/OuterTypeFilenameInvalid.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2017-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This is an example of a class name not matching its filename.
+ *
+ * @author Christoph Dreis
+ */
+public class NameNotMatching {
+
+}
diff --git a/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/OuterTypeFilenameValid.java b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/OuterTypeFilenameValid.java
new file mode 100644
index 00000000..c9ee62bc
--- /dev/null
+++ b/spring-javaformat/spring-javaformat-checkstyle/src/test/resources/source/OuterTypeFilenameValid.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2017-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This is a valid example of a class name matching its filename.
+ *
+ * @author Christoph Dreis
+ */
+public class OuterTypeFilenameValid {
+
+}