Use system specific line separators in asserts

Author: philwebb

spring-javaformat-maven/spring-javaformat-maven-plugin/src/test/java/io/spring/format/maven/VerifyApply.java

@@ -30,12 +30,14 @@
  */
 public class VerifyApply {
 
+	private static final String LF = System.lineSeparator();
+
 	private static final String JAVA_FILE = "src/main/java/simple/Simple.java";
 
 	public void verify(File base) throws IOException {
 		String formated = new String(Files.readAllBytes(base.toPath().resolve(JAVA_FILE)),
 				StandardCharsets.UTF_8);
-		assertThat(formated).contains("Simple.\n *\n * @author")
+		assertThat(formated).contains("Simple." + LF + " *" + LF + " * @author")
 				.contains("public class Simple {");
 	}