Fixed escaping of path string literals in test-with-junit.

Important especially on Windows, where backslashes in paths would
otherwise cause string syntax errors in the generated test scripts.

src/main/java/com/theoryinpractise/clojure/ClojureRunTestWithJUnitMojo.java

@@ -82,15 +82,15 @@ public void execute() throws MojoExecutionException {
 					for (NamespaceInFile namespace : ns) {
 						if (xmlEscapeOutput) {
 							// Assumes with-junit-output uses with-test-out internally when necessary.  xml escape anything sent to *out*.
-							runTestLine.append("(with-open [writer (clojure.java.io/writer \"" + testOutputDirectory + "/" + namespace.getName() + ".xml\") ");
+							runTestLine.append("(with-open [writer (clojure.java.io/writer \"" + escapeFilePath(testOutputDirectory, namespace.getName() + ".xml") + "\") ");
 							runTestLine.append("            escaped (xml-escaping-writer writer)] ");
 							runTestLine.append("(binding [*test-out* writer *out* escaped] (with-junit-output ");
 							runTestLine.append("(run-tests");
 							runTestLine.append(" '" + namespace.getName());
 							runTestLine.append("))))");
 						} else {
 							// Use with-test-out to fix with-junit-output until clojure #431 is fixed
-							runTestLine.append("(with-open [writer (clojure.java.io/writer \"" + testOutputDirectory + "/" + namespace.getName() + ".xml\")] ");
+							runTestLine.append("(with-open [writer (clojure.java.io/writer \"" + escapeFilePath(testOutputDirectory, namespace.getName() + ".xml") + "\")] ");
 							runTestLine.append("(binding [*test-out* writer] (with-test-out (with-junit-output ");
 							runTestLine.append("(run-tests");
 							runTestLine.append(" '" + namespace.getName());
@@ -127,4 +127,17 @@ public void execute() throws MojoExecutionException {
 		}
 	}
 
+	/**
+	 * Escapes the given file path so that it's safe for inclusion in a
+	 * Clojure string literal.
+	 *
+	 * @param directory directory path
+	 * @param file file name
+	 * @return escaped file path, ready for inclusion in a string literal
+	 */
+	private static String escapeFilePath(String directory, String file) {
+		// TODO: Should handle also possible newlines, etc.
+		return new File(directory, file).getPath().replace("\\", "\\\\");
+	}
+
 }