add integration test for CloudWatch metrics (localstack#9)

Author: duongpv7

src/test/java/cloud/localstack/CWMetricsTest.java

@@ -0,0 +1,60 @@
+package cloud.localstack;
+
+import cloud.localstack.docker.annotation.LocalstackDockerProperties;
+import com.amazonaws.services.cloudwatch.AmazonCloudWatch;
+import com.amazonaws.services.cloudwatch.model.*;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+
+/**
+ * Test integration of CloudWatch metrics with LocalStack
+ * Issue: https://github.com/localstack/localstack/issues/712
+ */
+@RunWith(LocalstackTestRunner.class)
+@LocalstackDockerProperties(ignoreDockerRunErrors=true)
+public class CWMetricsTest {
+    @Test
+    public void testCWMetricsAPIs() throws ParseException {
+        final AmazonCloudWatch cw = TestUtils.getClientCloudWatch();
+        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
+
+        Dimension dimension = new Dimension()
+                .withName("UNIQUE_PAGES")
+                .withValue("URLS");
+
+        /* Put metric data without value */
+        MetricDatum datum = new MetricDatum()
+                .withMetricName("PAGES_VISITED")
+                .withUnit(StandardUnit.None)
+                .withTimestamp(dateFormat.parse("2019-01-02"))
+                .withDimensions(dimension);
+
+        PutMetricDataRequest putMetricDataRequest = new PutMetricDataRequest()
+                .withNamespace("SITE/TRAFFIC")
+                .withMetricData(datum);
+
+        cw.putMetricData(putMetricDataRequest);
+
+        /* Get metric statistics */
+        GetMetricStatisticsRequest getMetricStatisticsRequest = new GetMetricStatisticsRequest()
+                .withMetricName("PAGES_VISITED")
+                .withNamespace("SITE/TRAFFIC")
+                /* When calling GetMetricStatistics, must specify either Statistics or ExtendedStatistics, but not both.
+                   https://docs.aws.amazon.com/cli/latest/reference/cloudwatch/get-metric-statistics.html */
+                .withStatistics("Statistics")
+                .withStartTime(dateFormat.parse("2019-01-01"))
+                .withEndTime(dateFormat.parse("2019-01-03"))
+                .withPeriod(360);
+
+        GetMetricStatisticsResult metricStatistics = cw.getMetricStatistics(getMetricStatisticsRequest);
+        Assert.assertEquals(metricStatistics.getDatapoints().size(), 1);
+
+        /* List metric work as expectation */
+        ListMetricsResult metrics = cw.listMetrics(new ListMetricsRequest());
+        Assert.assertEquals(metrics.getMetrics().size(), 1);
+    }
+}