Add implementation for gauges. (#1365)

* Add implementation for gauges.

* Remove usage of internal class in implcore tests.

1 files changed, 6 insertions, 0 deletions

diff --git a/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java b/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java
index ab8889a9..7ee900a6 100644
--- a/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java
+++ b/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java
@@ -18,6 +18,7 @@ package io.opencensus.impllite.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
+import io.opencensus.implcore.metrics.MetricRegistryImpl;
 import io.opencensus.implcore.metrics.export.ExportComponentImpl;
 import io.opencensus.metrics.Metrics;
 import io.opencensus.metrics.MetricsComponent;
@@ -33,4 +34,9 @@ public class MetricsTest {
   public void getExportComponent() {
     assertThat(Metrics.getExportComponent()).isInstanceOf(ExportComponentImpl.class);
   }
+
+  @Test
+  public void getMetricRegistry() {
+    assertThat(Metrics.getMetricRegistry()).isInstanceOf(MetricRegistryImpl.class);
+  }
 }