util_test.go: Unittests for util.go

Add unit tests for func StringInSlice.

Signed-off-by: baude <bbaude@redhat.com>

cmd/kpod/create_cli_test.go

@@ -1,10 +1,11 @@
 package main
 
 import (
-	"github.com/stretchr/testify/assert"
 	"io/ioutil"
 	"os"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 var (

libpod/util_test.go

@@ -0,0 +1,19 @@
+package libpod
+
+
+import (
+	"testing"
+	"github.com/stretchr/testify/assert"
+)
+var (
+	sliceData = []string{"one", "two", "three", "four"}
+)
+
+func TestStringInSlice(t *testing.T) {
+	// string is in the slice
+	assert.True(t, StringInSlice("one", sliceData))
+	// string is not in the slice
+	assert.False(t, StringInSlice("five", sliceData))
+	// string is not in empty slice
+	assert.False(t, StringInSlice("one", []string{}))
+}