method for running tests without system exit

optional/iwant-plugin-junit5runner/src/main/java/org/fluentjava/iwant/plugin/junit5runner/Junit5Runner.java

@@ -9,6 +9,15 @@
 public class Junit5Runner {
 
 	public static void main(String[] args) {
+		int exitCode = -1;
+		try {
+			exitCode = run(args);
+		} finally {
+			System.exit(exitCode);
+		}
+	}
+
+	public static int run(String[] args) {
 		List<String> runnerArgs = new ArrayList<>();
 
 		for (String arg : args) {
@@ -17,17 +26,15 @@ public static void main(String[] args) {
 		}
 		if (runnerArgs.isEmpty()) {
 			System.err.println("No tests given, exiting.");
-			return;
+			return 0;
 		}
 
-		int exitCode = 1;
 		try (PrintWriter out = new PrintWriter(System.out);
 				PrintWriter err = new PrintWriter(System.err)) {
-			exitCode = ConsoleLauncher
+			return ConsoleLauncher
 					.run(out, err, runnerArgs.toArray(new String[0]))
 					.getExitCode();
-		} finally {
-			System.exit(exitCode);
 		}
 	}
+
 }