chore: add basic test for OpenCensus spans

google-http-client/pom.xml

@@ -84,6 +84,19 @@
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
     </dependency>
+    <dependency>
+      <groupId>com.google.j2objc</groupId>
+      <artifactId>j2objc-annotations</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.opencensus</groupId>
+      <artifactId>opencensus-api</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>io.opencensus</groupId>
+      <artifactId>opencensus-contrib-http-util</artifactId>
+    </dependency>
+
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava-testlib</artifactId>
@@ -104,17 +117,15 @@
       <artifactId>mockito-all</artifactId>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>com.google.j2objc</groupId>
-      <artifactId>j2objc-annotations</artifactId>
-    </dependency>
     <dependency>
       <groupId>io.opencensus</groupId>
-      <artifactId>opencensus-api</artifactId>
+      <artifactId>opencensus-impl</artifactId>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>io.opencensus</groupId>
-      <artifactId>opencensus-contrib-http-util</artifactId>
+      <artifactId>opencensus-testing</artifactId>
+      <scope>test</scope>
     </dependency>
   </dependencies>
 </project>

google-http-client/src/test/java/com/google/api/client/http/HttpRequestTracingTest.java

@@ -0,0 +1,91 @@
+package com.google.api.client.http;
+
+import com.google.api.client.testing.http.MockHttpTransport;
+import com.google.api.client.testing.http.MockLowLevelHttpResponse;
+import io.opencensus.common.Functions;
+import io.opencensus.testing.export.TestHandler;
+import io.opencensus.trace.AttributeValue;
+import io.opencensus.trace.MessageEvent;
+import io.opencensus.trace.Status;
+import io.opencensus.trace.Tracing;
+import io.opencensus.trace.config.TraceParams;
+import io.opencensus.trace.export.SpanData;
+import io.opencensus.trace.samplers.Samplers;
+import org.junit.*;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import static com.google.api.client.http.OpenCensusUtils.SPAN_NAME_HTTP_REQUEST_EXECUTE;
+import static org.junit.Assert.*;
+
+public class HttpRequestTracingTest {
+  private static final TestHandler testHandler = new TestHandler();
+
+  @Before
+  public void setupTestTracer() {
+    Tracing.getExportComponent().getSpanExporter().registerHandler("test", testHandler);
+    TraceParams params =
+        Tracing.getTraceConfig()
+            .getActiveTraceParams()
+            .toBuilder()
+            .setSampler(Samplers.alwaysSample())
+            .build();
+    Tracing.getTraceConfig().updateActiveTraceParams(params);
+  }
+
+  @After
+  public void teardownTestTracer() {
+    Tracing.getExportComponent().getSpanExporter().unregisterHandler("test");
+  }
+
+  @Test(timeout = 20_000L)
+  public void testExecute_spanClosureOnException() throws IOException {
+    MockLowLevelHttpResponse mockResponse = new MockLowLevelHttpResponse()
+        .setStatusCode(200);
+    HttpTransport transport = new MockHttpTransport.Builder()
+        .setLowLevelHttpResponse(mockResponse)
+        .build();
+    HttpRequest request = new HttpRequestFactory(transport, null)
+        .buildGetRequest(new GenericUrl("https://google.com/"));
+    HttpResponse response = request.execute();
+
+    List<SpanData> spans = testHandler.waitForExport(1);
+    assertEquals(1, spans.size());
+    SpanData span = spans.get(0);
+
+    // Ensure the span name is set
+    assertEquals(SPAN_NAME_HTTP_REQUEST_EXECUTE, span.getName());
+
+    // Ensure we have basic span attributes
+    assertAttributeEquals(span, "http.path", "/");
+    assertAttributeEquals(span, "http.host", "google.com");
+    assertAttributeEquals(span, "http.url", "https://google.com/");
+    assertAttributeEquals(span, "http.method", "GET");
+
+    // Ensure we have a single annotation for starting the first attempt
+    assertEquals(1, span.getAnnotations().getEvents().size());
+
+    // Ensure we have 2 message events, SENT and RECEIVED
+    assertEquals(2, span.getMessageEvents().getEvents().size());
+    assertEquals(MessageEvent.Type.SENT, span.getMessageEvents().getEvents().get(0).getEvent().getType());
+    assertEquals(MessageEvent.Type.RECEIVED, span.getMessageEvents().getEvents().get(1).getEvent().getType());
+
+    // Ensure we correctly record the span status as OK
+    assertEquals(Status.OK, span.getStatus());
+  }
+
+  void assertAttributeEquals(SpanData span, String attributeName, String expectedValue) {
+    Object attributeValue = span.getAttributes().getAttributeMap().get(attributeName);
+    assertNotNull("expected span to contain attribute: " + attributeName, attributeValue);
+    assertTrue(attributeValue instanceof AttributeValue);
+    String value = ((AttributeValue) attributeValue).match(
+        Functions.returnToString(),
+        Functions.returnToString(),
+        Functions.returnToString(),
+        Functions.returnToString(),
+        Functions.</*@Nullable*/ String>returnNull());
+    assertEquals(expectedValue, value);
+  }
+}

pom.xml

@@ -242,6 +242,16 @@
         <artifactId>opencensus-contrib-http-util</artifactId>
         <version>${project.opencensus.version}</version>
       </dependency>
+      <dependency>
+        <groupId>io.opencensus</groupId>
+        <artifactId>opencensus-impl</artifactId>
+        <version>${project.opencensus.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>io.opencensus</groupId>
+        <artifactId>opencensus-testing</artifactId>
+        <version>${project.opencensus.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>