(cloudwatch) add test for custom metrics

pkg/api/cloudwatch/metrics_test.go

+package cloudwatch
+
+import (
+	"testing"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/cloudwatch"
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestCloudWatchMetrics(t *testing.T) {
+
+	Convey("When calling getMetricsForCustomMetrics", t, func() {
+		region := "us-east-1"
+		namespace := "Foo"
+		database := "default"
+		f := func(region string, namespace string, database string) (cloudwatch.ListMetricsOutput, error) {
+			return cloudwatch.ListMetricsOutput{
+				Metrics: []*cloudwatch.Metric{
+					{
+						MetricName: aws.String("Test_MetricName"),
+						Dimensions: []*cloudwatch.Dimension{
+							{
+								Name: aws.String("Test_DimensionName"),
+							},
+						},
+					},
+				},
+			}, nil
+		}
+		metrics, _ := getMetricsForCustomMetrics(region, namespace, database, f)
+
+		Convey("Should contain Test_MetricName", func() {
+			So(metrics, ShouldContain, "Test_MetricName")
+		})
+	})
+
+	Convey("When calling getDimensionsForCustomMetrics", t, func() {
+		region := "us-east-1"
+		namespace := "Foo"
+		database := "default"
+		f := func(region string, namespace string, database string) (cloudwatch.ListMetricsOutput, error) {
+			return cloudwatch.ListMetricsOutput{
+				Metrics: []*cloudwatch.Metric{
+					{
+						MetricName: aws.String("Test_MetricName"),
+						Dimensions: []*cloudwatch.Dimension{
+							{
+								Name: aws.String("Test_DimensionName"),
+							},
+						},
+					},
+				},
+			}, nil
+		}
+		dimensionKeys, _ := getDimensionsForCustomMetrics(region, namespace, database, f)
+
+		Convey("Should contain Test_DimensionName", func() {
+			So(dimensionKeys, ShouldContain, "Test_DimensionName")
+		})
+	})
+
+}