Add "Thanks for using JUnit!" banner

This commit introduces a message that is displayed every time the
JUnit Platform Console Launcher is executed. That message reads:

  Thanks for using JUnit!
  Support its development at https://junit.org/sponsoring

Users may use the new `--disable-banner` command line option of
the Console Launcher to prevent the display of the banner.

Closes #1755

Author: sormuras

junit-platform-console/src/main/java/org/junit/platform/console/ConsoleLauncher.java

@@ -80,6 +80,9 @@ ConsoleLauncherExecutionResult execute(String... args) {
 			return ConsoleLauncherExecutionResult.failed();
 		}
 		try (PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(outStream, charset)))) {
+			if (!options.isBannerDisabled()) {
+				displayBanner(out);
+			}
 			if (options.isDisplayHelp()) {
 				commandLineOptionsParser.printHelp(out);
 				return ConsoleLauncherExecutionResult.success();
@@ -92,6 +95,12 @@ ConsoleLauncherExecutionResult execute(String... args) {
 		}
 	}
 
+	void displayBanner(PrintWriter out) {
+		out.println();
+		out.println("Thanks for using JUnit! Support its development at https://junit.org/sponsoring");
+		out.println();
+	}
+
 	private ConsoleLauncherExecutionResult executeTests(CommandLineOptions options, PrintWriter out) {
 		try {
 			TestExecutionSummary testExecutionSummary = new ConsoleTestExecutor(options).execute(out);

junit-platform-console/src/main/java/org/junit/platform/console/options/AvailableOptions.java

@@ -50,6 +50,12 @@ class AvailableOptions {
 	@Option(names = "-disable-ansi-colors", hidden = true)
 	private boolean disableAnsiColors2;
 
+	@Option(names = "--disable-banner", description = "Disable print out of the welcome message.")
+	private boolean disableBanner;
+
+	@Option(names = "-disable-banner", hidden = true)
+	private boolean disableBanner2;
+
 	@Option(names = "--details", paramLabel = "MODE", description = "Select an output details mode for when tests are executed. " //
 			+ "Use one of: ${COMPLETION-CANDIDATES}. If 'none' is selected, " //
 			+ "then only the summary and test failures are shown. Default: ${DEFAULT-VALUE}.")
@@ -286,6 +292,7 @@ CommandLineOptions toCommandLineOptions(ParseResult parseResult) {
 		// General Purpose
 		result.setDisplayHelp(this.helpRequested || this.helpRequested2);
 		result.setAnsiColorOutputDisabled(this.disableAnsiColors || this.disableAnsiColors2);
+		result.setBannerDisabled(this.disableBanner || this.disableBanner2);
 		result.setDetails(choose(this.details, this.details2, CommandLineOptions.DEFAULT_DETAILS));
 		result.setTheme(choose(this.theme, this.theme2, CommandLineOptions.DEFAULT_THEME));
 		result.setAdditionalClasspathEntries(merge(this.additionalClasspathEntries, this.additionalClasspathEntries2));

junit-platform-console/src/main/java/org/junit/platform/console/options/CommandLineOptions.java

@@ -39,6 +39,7 @@ public class CommandLineOptions {
 
 	private boolean displayHelp;
 	private boolean ansiColorOutputDisabled;
+	private boolean bannerDisabled;
 	private Details details = DEFAULT_DETAILS;
 	private Theme theme = DEFAULT_THEME;
 	private List<Path> additionalClasspathEntries = emptyList();
@@ -87,6 +88,14 @@ public void setAnsiColorOutputDisabled(boolean ansiColorOutputDisabled) {
 		this.ansiColorOutputDisabled = ansiColorOutputDisabled;
 	}
 
+	public boolean isBannerDisabled() {
+		return this.bannerDisabled;
+	}
+
+	public void setBannerDisabled(boolean bannerDisabled) {
+		this.bannerDisabled = bannerDisabled;
+	}
+
 	public boolean isScanModulepath() {
 		return this.scanModulepath;
 	}

platform-tests/src/test/java/org/junit/platform/console/ConsoleDetailsTests.java

@@ -93,6 +93,7 @@ private List<DynamicNode> scanContainerClassAndCreateDynamicTests(Class<?> conta
 							"--details", details.name(), //
 							"--details-theme", theme.name(), //
 							"--disable-ansi-colors", //
+							"--disable-banner", //
 							"--include-classname", containerClass.getCanonicalName(), //
 							"--select-method", getFullyQualifiedMethodName(containerClass, methodName, types) //
 					};

platform-tests/src/test/java/org/junit/platform/console/ConsoleLauncherTests.java

@@ -11,13 +11,16 @@
 package org.junit.platform.console;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertLinesMatch;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
+import java.util.List;
+import java.util.stream.Collectors;
 
 import org.junit.jupiter.api.Test;
 import org.junit.platform.console.options.CommandLineOptions;
@@ -28,7 +31,8 @@
  */
 class ConsoleLauncherTests {
 
-	private final PrintStream printSink = new PrintStream(new ByteArrayOutputStream());
+	private final ByteArrayOutputStream printedBytes = new ByteArrayOutputStream(1000);
+	private final PrintStream printSink = new PrintStream(printedBytes);
 
 	@Test
 	void displayHelp() {
@@ -45,6 +49,40 @@ void displayHelp() {
 		verify(commandLineOptionsParser).parse("--help");
 	}
 
+	@Test
+	void displayBanner() {
+		CommandLineOptions options = new CommandLineOptions();
+		options.setBannerDisabled(false);
+		options.setDisplayHelp(true);
+
+		CommandLineOptionsParser commandLineOptionsParser = mock(CommandLineOptionsParser.class);
+		when(commandLineOptionsParser.parse(any())).thenReturn(options);
+
+		ConsoleLauncher consoleLauncher = new ConsoleLauncher(commandLineOptionsParser, printSink, printSink);
+		int exitCode = consoleLauncher.execute("--help").getExitCode();
+
+		assertEquals(0, exitCode);
+		assertLinesMatch(
+			List.of("", "Thanks for using JUnit! Support its development at https://junit.org/sponsoring", ""),
+			printedBytes.toString().lines().collect(Collectors.toList()));
+	}
+
+	@Test
+	void disableBanner() {
+		CommandLineOptions options = new CommandLineOptions();
+		options.setBannerDisabled(true);
+		options.setDisplayHelp(true);
+
+		CommandLineOptionsParser commandLineOptionsParser = mock(CommandLineOptionsParser.class);
+		when(commandLineOptionsParser.parse(any())).thenReturn(options);
+
+		ConsoleLauncher consoleLauncher = new ConsoleLauncher(commandLineOptionsParser, printSink, printSink);
+		int exitCode = consoleLauncher.execute("--help", "--disable-banner").getExitCode();
+
+		assertEquals(0, exitCode);
+		assertLinesMatch(List.of(), printedBytes.toString().lines().collect(Collectors.toList()));
+	}
+
 	@Test
 	void executeWithUnknownCommandLineOption() {
 		CommandLineOptionsParser commandLineOptionsParser = mock(CommandLineOptionsParser.class);

platform-tooling-support-tests/src/test/java/platform/tooling/support/tests/MultiReleaseJarTests.java

@@ -34,6 +34,7 @@ class MultiReleaseJarTests {
 	void checkDefault() throws Exception {
 		var variant = "default";
 		var expectedLines = List.of( //
+			">> BANNER >>",
 			".", //
 			"'-- JUnit Jupiter [OK]", //
 			"  '-- JupiterIntegrationTests [OK]", //
@@ -70,7 +71,7 @@ void checkDefault() throws Exception {
 	void checkNoScripting() throws Exception {
 		var variant = "no-scripting";
 		var expectedLines = List.of( //
-			".", //
+			">> BANNER >>", ".", //
 			"'-- JUnit Jupiter [OK]", //
 			"  '-- JupiterIntegrationTests [OK]", //
 			"    +-- javaPlatformModuleSystemIsAvailable() [OK]", //

platform-tooling-support-tests/src/test/java/platform/tooling/support/tests/StandaloneTests.java

@@ -67,6 +67,7 @@ void test() throws IOException {
 				.addArguments("-Djava.util.logging.config.file=logging.properties") //
 				.addArguments("-jar", jar) //
 				.addArguments("--scan-class-path") //
+				.addArguments("--disable-banner") //
 				.addArguments("--include-classname", "standalone.*") //
 				.addArguments("--classpath", "bin").build() //
 				.run(false);