Merge pull request #125 from marcellmartini/master

Refactory of multiValueFlag.String()

cmd/echoip/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"log"
+	"strings"
 
 	"os"
 
@@ -14,14 +15,7 @@ import (
 type multiValueFlag []string
 
 func (f *multiValueFlag) String() string {
-	vs := ""
-	for i, v := range *f {
-		vs += v
-		if i < len(*f)-1 {
-			vs += ", "
-		}
-	}
-	return vs
+	return strings.Join([]string(*f), ", ")
 }
 
 func (f *multiValueFlag) Set(v string) error {

cmd/echoip/main_test.go

@@ -0,0 +1,42 @@
+package main
+
+import "testing"
+
+func TestMultiValueFlagString(t *testing.T) {
+	var xmvf = []struct {
+		values multiValueFlag
+		expect string
+	}{
+		{
+			values: multiValueFlag{
+				"test",
+				"with multiples",
+				"flags",
+			},
+			expect: `test, with multiples, flags`,
+		},
+		{
+			values: multiValueFlag{
+				"test",
+			},
+			expect: `test`,
+		},
+		{
+			values: multiValueFlag{
+				"",
+			},
+			expect: ``,
+		},
+		{
+			values: nil,
+			expect: ``,
+		},
+	}
+
+	for _, mvf := range xmvf {
+		got := mvf.values.String()
+		if got != mvf.expect {
+			t.Errorf("\nFor: %#v\nExpected: %v\nGot: %v", mvf.values, mvf.expect, got)
+		}
+	}
+}