 	func testStrictParsing () {
 		let parser = ArgumentParser()
 		let arguments = ["--alpha", "-b"]
-		parser.add(BoolArgument(short: "a", long: "alpha"))
-		parser.add(BoolArgument(short: "b", long: "bravo"))
+		_ = parser.add(BoolArgument(short: "a", long: "alpha"))
+		_ = parser.add(BoolArgument(short: "b", long: "bravo"))
 
 		do {
 			try parser.parse(arguments, strict: true)

	func testStrictParsingThrowsErrorOnUnknownArguments () {
		let parser = ArgumentParser()
		let arguments = ["--alpha", "-c"]
		parser.add(BoolArgument(short: "a", long: "alpha", helptext: "The leader."))
		parser.add(BoolArgument(short: "b", long: "bravo", helptext: "Well done!"))

		do {
			try parser.parse(arguments, strict: true)


	func testUsageText () {
		let parser = ArgumentParser()
		_ = parser.add(BoolArgument(short: "a", long: "alpha", helptext: "The leader."))
		_ = parser.add(StringArgument(short: "b", long: "bravo", helptext: "Well done!"))
		_ = parser.add(BoolArgument(short: "x", long: "hasnohelptext"))

		let usagetext = parser.usagetext
		XCTAssert(usagetext.contains("alpha"))
