adding int alias and test

altsrc/flag.go

@@ -186,12 +186,16 @@ func (f *PathFlag) ApplyInputSourceValue(cCtx *cli.Context, isc InputSourceConte
 // ApplyInputSourceValue applies a int value to the flagSet if required
 func (f *IntFlag) ApplyInputSourceValue(cCtx *cli.Context, isc InputSourceContext) error {
 	if f.set != nil && !(cCtx.IsSet(f.Name) || isEnvVarSet(f.EnvVars)) && isc.isSet(f.IntFlag.Name) {
-		value, err := isc.Int(f.IntFlag.Name)
+		for _, name := range f.IntFlag.Names() {
-		if err != nil {
+			if isc.isSet(name) {
-			return err
+				value, err := isc.Int(name)
-		}
+				if err != nil {
-		for _, name := range f.Names() {
+					return err
-			_ = f.set.Set(name, strconv.FormatInt(int64(value), 10))
+				}
+				for _, n := range f.Names() {
+					_ = f.set.Set(n, strconv.FormatInt(int64(value), 10))
+				}
+			}
 		}
 	}
 	return nil

altsrc/flag_test.go

@@ -332,6 +332,19 @@ func TestPathApplyInputSourceMethodEnvVarSet(t *testing.T) {
 	refute(t, "goodbye", c.String("test"))
 }
 
+func TestIntApplyInputSourceMethodSet_Alias(t *testing.T) {
+	tis := testApplyInputSource{
+		Flag:     NewIntFlag(&cli.IntFlag{Name: "test", Aliases: []string{"test_alias"}}),
+		FlagName: "test",
+		MapValue: 15,
+	}
+	c := runTest(t, tis)
+	expect(t, 15, c.Int("test_alias"))
+
+	c = runRacyTest(t, tis)
+	refute(t, 15, c.Int("test_alias"))
+}
+
 func TestIntApplyInputSourceMethodSet(t *testing.T) {
 	tis := testApplyInputSource{
 		Flag:     NewIntFlag(&cli.IntFlag{Name: "test"}),