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/*
* Copyright 2017, OpenCensus Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.opencensus.trace;
import static com.google.common.truth.Truth.assertThat;
import static org.mockito.Matchers.same;
import static org.mockito.Mockito.verifyZeroInteractions;
import static org.mockito.Mockito.when;
import io.opencensus.common.Scope;
import java.util.concurrent.Callable;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
/** Unit tests for {@link Tracer}. */
@RunWith(JUnit4.class)
// Need to suppress warnings for MustBeClosed because Java-6 does not support try-with-resources.
@SuppressWarnings("MustBeClosedChecker")
public class TracerTest {
private static final Tracer noopTracer = Tracer.getNoopTracer();
private static final String SPAN_NAME = "MySpanName";
@Mock private Tracer tracer;
@Mock private SpanBuilder spanBuilder;
@Mock private Span span;
@Before
public void setUp() {
MockitoAnnotations.initMocks(this);
}
@Test
public void defaultGetCurrentSpan() {
assertThat(noopTracer.getCurrentSpan()).isEqualTo(BlankSpan.INSTANCE);
}
@Test(expected = NullPointerException.class)
public void withSpan_NullSpan() {
noopTracer.withSpan(null);
}
@Test
public void getCurrentSpan_WithSpan() {
assertThat(noopTracer.getCurrentSpan()).isSameAs(BlankSpan.INSTANCE);
Scope ws = noopTracer.withSpan(span);
try {
assertThat(noopTracer.getCurrentSpan()).isSameAs(span);
} finally {
ws.close();
}
assertThat(noopTracer.getCurrentSpan()).isSameAs(BlankSpan.INSTANCE);
}
@Test
public void wrapRunnable() {
Runnable runnable;
assertThat(noopTracer.getCurrentSpan()).isSameAs(BlankSpan.INSTANCE);
runnable =
tracer.withSpan(
span,
new Runnable() {
@Override
public void run() {
assertThat(noopTracer.getCurrentSpan()).isSameAs(span);
}
});
// When we run the runnable we will have the span in the current Context.
runnable.run();
verifyZeroInteractions(span);
assertThat(noopTracer.getCurrentSpan()).isSameAs(BlankSpan.INSTANCE);
}
@Test
public void wrapCallable() throws Exception {
final Object ret = new Object();
Callable<Object> callable;
assertThat(noopTracer.getCurrentSpan()).isSameAs(BlankSpan.INSTANCE);
callable =
tracer.withSpan(
span,
new Callable<Object>() {
@Override
public Object call() throws Exception {
assertThat(noopTracer.getCurrentSpan()).isSameAs(span);
return ret;
}
});
// When we call the callable we will have the span in the current Context.
assertThat(callable.call()).isEqualTo(ret);
verifyZeroInteractions(span);
assertThat(noopTracer.getCurrentSpan()).isSameAs(BlankSpan.INSTANCE);
}
@Test(expected = NullPointerException.class)
public void spanBuilderWithName_NullName() {
noopTracer.spanBuilder(null);
}
@Test
public void defaultSpanBuilderWithName() {
assertThat(noopTracer.spanBuilder(SPAN_NAME).startSpan()).isSameAs(BlankSpan.INSTANCE);
}
@Test(expected = NullPointerException.class)
public void spanBuilderWithParentAndName_NullName() {
noopTracer.spanBuilderWithExplicitParent(null, null);
}
@Test
public void defaultSpanBuilderWithParentAndName() {
assertThat(noopTracer.spanBuilderWithExplicitParent(SPAN_NAME, null).startSpan())
.isSameAs(BlankSpan.INSTANCE);
}
@Test(expected = NullPointerException.class)
public void spanBuilderWithRemoteParent_NullName() {
noopTracer.spanBuilderWithRemoteParent(null, null);
}
@Test
public void defaultSpanBuilderWithRemoteParent_NullParent() {
assertThat(noopTracer.spanBuilderWithRemoteParent(SPAN_NAME, null).startSpan())
.isSameAs(BlankSpan.INSTANCE);
}
@Test
public void defaultSpanBuilderWithRemoteParent() {
assertThat(noopTracer.spanBuilderWithRemoteParent(SPAN_NAME, SpanContext.INVALID).startSpan())
.isSameAs(BlankSpan.INSTANCE);
}
@Test
public void startSpanWithParentFromContext() {
Scope ws = tracer.withSpan(span);
try {
assertThat(tracer.getCurrentSpan()).isSameAs(span);
when(tracer.spanBuilderWithExplicitParent(same(SPAN_NAME), same(span)))
.thenReturn(spanBuilder);
assertThat(tracer.spanBuilder(SPAN_NAME)).isSameAs(spanBuilder);
} finally {
ws.close();
}
}
@Test
public void startSpanWithInvalidParentFromContext() {
Scope ws = tracer.withSpan(BlankSpan.INSTANCE);
try {
assertThat(tracer.getCurrentSpan()).isSameAs(BlankSpan.INSTANCE);
when(tracer.spanBuilderWithExplicitParent(same(SPAN_NAME), same(BlankSpan.INSTANCE)))
.thenReturn(spanBuilder);
assertThat(tracer.spanBuilder(SPAN_NAME)).isSameAs(spanBuilder);
} finally {
ws.close();
}
}
}
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