added tap acceptance tests, fixed duplicate namespace problem (#244)

cli/cmd/tapRunner.go

@@ -561,7 +561,7 @@ func getNamespaces(kubernetesProvider *kubernetes.Provider) []string {
 	if config.Config.Tap.AllNamespaces {
 		return []string{mizu.K8sAllNamespaces}
 	} else if len(config.Config.Tap.Namespaces) > 0 {
-		return config.Config.Tap.Namespaces
+		return mizu.Unique(config.Config.Tap.Namespaces)
 	} else {
 		return []string{kubernetesProvider.CurrentNamespace()}
 	}

cli/mizu/sliceUtils.go

@@ -9,3 +9,17 @@ func Contains(slice []string, containsValue string) bool {
 
 	return false
 }
+
+func Unique(slice []string) []string {
+	keys := make(map[string]bool)
+	var list []string
+
+	for _, entry := range slice {
+		if _, value := keys[entry]; !value {
+			keys[entry] = true
+			list = append(list, entry)
+		}
+	}
+
+	return list
+}

cli/mizu/sliceUtils_test.go

@@ -1,7 +1,9 @@
 package mizu_test
 
 import (
+	"fmt"
 	"github.com/up9inc/mizu/cli/mizu"
+	"reflect"
 	"testing"
 )
 
@@ -88,3 +90,41 @@ func TestContainsNilSlice(t *testing.T) {
 		})
 	}
 }
+
+func TestUniqueNoDuplicateValues(t *testing.T) {
+	tests := []struct {
+		Slice         []string
+		Expected      []string
+	}{
+		{Slice: []string{"apple", "orange", "banana", "grapes"}, Expected: []string{"apple", "orange", "banana", "grapes"}},
+		{Slice: []string{"dog", "cat", "mouse"}, Expected: []string{"dog", "cat", "mouse"}},
+	}
+
+	for index, test := range tests {
+		t.Run(fmt.Sprintf("%v", index), func(t *testing.T) {
+			actual := mizu.Unique(test.Slice)
+			if !reflect.DeepEqual(test.Expected, actual) {
+				t.Errorf("unexpected result - Expected: %v, actual: %v", test.Expected, actual)
+			}
+		})
+	}
+}
+
+func TestUniqueDuplicateValues(t *testing.T) {
+	tests := []struct {
+		Slice         []string
+		Expected      []string
+	}{
+		{Slice: []string{"apple", "apple", "orange", "orange", "banana", "banana", "grapes", "grapes"}, Expected: []string{"apple", "orange", "banana", "grapes"}},
+		{Slice: []string{"dog", "cat", "cat", "mouse"}, Expected: []string{"dog", "cat", "mouse"}},
+	}
+
+	for index, test := range tests {
+		t.Run(fmt.Sprintf("%v", index), func(t *testing.T) {
+			actual := mizu.Unique(test.Slice)
+			if !reflect.DeepEqual(test.Expected, actual) {
+				t.Errorf("unexpected result - Expected: %v, actual: %v", test.Expected, actual)
+			}
+		})
+	}
+}