Working on building test asset (open-telemetry#4389)

Author: ThomasJazz

sdk/metrics/src/main/java/io/opentelemetry/sdk/metrics/data/DelegatingMetricData.java

@@ -1,10 +1,10 @@
 package io.opentelemetry.sdk.metrics.data;
 
+import static java.util.Objects.requireNonNull;
+
 import io.opentelemetry.sdk.common.InstrumentationScopeInfo;
 import io.opentelemetry.sdk.resources.Resource;
 
-import static java.util.Objects.requireNonNull;
-
 public abstract class DelegatingMetricData implements MetricData {
 
   private final MetricData delegate;
@@ -17,6 +17,7 @@ protected DelegatingMetricData(MetricData delegate) {
   public Resource getResource() {
     return delegate.getResource();
   }
+
   @Override
   public InstrumentationScopeInfo getInstrumentationScopeInfo() {
     return delegate.getInstrumentationScopeInfo();

sdk/testing/src/main/java/io/opentelemetry/sdk/testing/metrics/TestMetricData.java

@@ -0,0 +1,98 @@
+package io.opentelemetry.sdk.testing.metrics;
+
+import com.google.auto.value.AutoValue;
+import io.opentelemetry.sdk.common.InstrumentationScopeInfo;
+import io.opentelemetry.sdk.metrics.data.Data;
+import io.opentelemetry.sdk.metrics.data.MetricData;
+import io.opentelemetry.sdk.metrics.data.MetricDataType;
+import io.opentelemetry.sdk.resources.Resource;
+import javax.annotation.concurrent.Immutable;
+
+@Immutable
+@AutoValue
+public abstract class TestMetricData implements MetricData {
+  public static Builder builder() {
+    //TODO: Need to figure out how to set the Data value
+    return new AutoValue_TestMetricData.Builder()
+        .setResource(Resource.empty())
+        .setInstrumentationScopeInfo(InstrumentationScopeInfo.empty())
+        .setDescription("")
+        .setUnit("1")
+        .setType(MetricDataType.DOUBLE_GAUGE);
+  }
+
+  /** A builder for {@link TestMetricData}. */
+  @AutoValue.Builder
+  public abstract static class Builder {
+    abstract TestMetricData autoBuild();
+
+    /**
+     * Builds and returns a new {@link MetricData} instance from the data in {@code this}
+     *
+     * @return a new {@link MetricData} instance
+     */
+    public TestMetricData build() {
+      return autoBuild();
+    }
+
+    /**
+     * Sets the resource of the metric
+     *
+     * @param resource the resource of the metric
+     * @return this
+     */
+    public abstract Builder setResource(Resource resource);
+
+    /**
+     * Sets the name of the metric
+     *
+     * @param name the name of the metric
+     * @return this
+     */
+    public abstract Builder setName(String name);
+
+    /**
+     * Sets the description of the metric
+     *
+     * @param description the description of the metric
+     * @return this
+     */
+    public abstract Builder setDescription(String description);
+
+    /**
+     * Sets the unit of the metric
+     *
+     * @param unit the unit of the metric
+     * @return this
+     */
+    public abstract Builder setUnit(String unit);
+
+    /**
+     * Sets the type of the metric
+     *
+     * @param type the type of the metric
+     * @return this
+     */
+    public abstract Builder setType(MetricDataType type);
+
+    /**
+     * Sets the data of the metric
+     *
+     * @param data the data of the metric
+     * @return this
+     */
+    public abstract Builder setData(Data<?> data);
+
+    /**
+     * Sets the Instrumentation scope of the metric
+     *
+     * @param instrumentationScopeInfo the instrumentation scope of the tracer which created this
+     * metric.
+     * @return this
+     */
+    public abstract Builder setInstrumentationScopeInfo(
+        InstrumentationScopeInfo instrumentationScopeInfo);
+
+  }
+
+}