Pay attention to system.lineseparator in XML formatter tests

Use the helper method to unify on the system line separator.

Author: akurtakov

ant/org.eclipse.ant.tests.ui/Ant Editor Tests/org/eclipse/ant/tests/ui/editor/formatter/XmlDocumentFormatterTest.java

@@ -94,8 +94,12 @@ private void simpleTest(String sourceFileName, String targetFileName, Formatting
 
 		XmlDocumentFormatter xmlFormatter = new XmlDocumentFormatter();
 		xmlFormatter.setDefaultLineDelimiter(System.lineSeparator());
-		String result = xmlFormatter.format(Files.readString(getBuildFile(sourceFileName).toPath()), prefs);
-		String expectedResult = Files.readString(getBuildFile(targetFileName).toPath());
+		// file content read via the helper method as it unifies the line separator to
+		// the system one
+		String result = xmlFormatter.format(
+				getReaderContentAsString(Files.newBufferedReader(getBuildFile(sourceFileName).toPath())), prefs);
+		String expectedResult = getReaderContentAsString(
+				Files.newBufferedReader((getBuildFile(targetFileName).toPath())));
 
 		assertEquals(expectedResult, result);
 	}