@@ -168,11 +168,14 @@ func testParse(f *FlagSet, t *testing.T) {

 	}

 	boolFlag := f.Bool([]string{"bool"}, false, "bool value")

 	bool2Flag := f.Bool([]string{"bool2"}, false, "bool2 value")

+	f.Bool([]string{"bool3"}, false, "bool3 value")

+	bool4Flag := f.Bool([]string{"bool4"}, false, "bool4 value")

 	intFlag := f.Int([]string{"-int"}, 0, "int value")

 	int64Flag := f.Int64([]string{"-int64"}, 0, "int64 value")

 	uintFlag := f.Uint([]string{"uint"}, 0, "uint value")

 	uint64Flag := f.Uint64([]string{"-uint64"}, 0, "uint64 value")

 	stringFlag := f.String([]string{"string"}, "0", "string value")

+	f.String([]string{"string2"}, "0", "string2 value")

 	singleQuoteFlag := f.String([]string{"squote"}, "", "single quoted value")

 	doubleQuoteFlag := f.String([]string{"dquote"}, "", "double quoted value")

 	mixedQuoteFlag := f.String([]string{"mquote"}, "", "mixed quoted value")

@@ -185,6 +188,7 @@ func testParse(f *FlagSet, t *testing.T) {

 	args := []string{

 		"-bool",

 		"-bool2=true",

+		"-bool4=false",

 		"--int", "22",

 		"--int64", "0x23",

 		"-uint", "24",

@@ -212,6 +216,18 @@ func testParse(f *FlagSet, t *testing.T) {

 	if *bool2Flag != true {

 		t.Error("bool2 flag should be true, is ", *bool2Flag)

 	}

+	if !f.IsSet("bool2") {

+		t.Error("bool2 should be marked as set")

+	}

+	if f.IsSet("bool3") {

+		t.Error("bool3 should not be marked as set")

+	}

+	if !f.IsSet("bool4") {

+		t.Error("bool4 should be marked as set")

+	}

+	if *bool4Flag != false {

+		t.Error("bool4 flag should be false, is ", *bool4Flag)

+	}

 	if *intFlag != 22 {

 		t.Error("int flag should be 22, is ", *intFlag)

 	}

@@ -227,6 +243,12 @@ func testParse(f *FlagSet, t *testing.T) {

 	if *stringFlag != "hello" {

 		t.Error("string flag should be `hello`, is ", *stringFlag)

 	}

+	if !f.IsSet("string") {

+		t.Error("string flag should be marked as set")

+	}

+	if f.IsSet("string2") {

+		t.Error("string2 flag should not be marked as set")

+	}

 	if *singleQuoteFlag != "single" {

 		t.Error("single quote string flag should be `single`, is ", *singleQuoteFlag)

 	}