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MultiTextMapPropagatorTest.java
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MultiTextMapPropagatorTest.java
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/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
package io.opentelemetry.context.propagation;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
import io.opentelemetry.context.Context;
import io.opentelemetry.context.ContextKey;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import javax.annotation.Nullable;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;
@ExtendWith(MockitoExtension.class)
class MultiTextMapPropagatorTest {
private static final ContextKey<String> KEY = ContextKey.named("key");
@Mock private TextMapPropagator propagator1;
@Mock private TextMapPropagator propagator2;
@Mock private TextMapPropagator propagator3;
private static final TextMapGetter<Map<String, String>> getter =
new TextMapGetter<Map<String, String>>() {
@Override
public Iterable<String> keys(Map<String, String> carrier) {
return carrier.keySet();
}
@Nullable
@Override
public String get(Map<String, String> carrier, String key) {
return carrier.get(key);
}
};
@Test
void addPropagator_null() {
assertThatThrownBy(() -> new MultiTextMapPropagator((List<TextMapPropagator>) null))
.isInstanceOf(NullPointerException.class);
}
@Test
void fields() {
when(propagator1.fields()).thenReturn(Arrays.asList("foo", "bar"));
when(propagator2.fields()).thenReturn(Arrays.asList("hello", "world"));
TextMapPropagator prop = new MultiTextMapPropagator(propagator1, propagator2);
Collection<String> fields = prop.fields();
assertThat(fields).containsExactly("foo", "bar", "hello", "world");
}
@Test
void fields_duplicates() {
when(propagator1.fields()).thenReturn(Arrays.asList("foo", "bar", "foo"));
when(propagator2.fields()).thenReturn(Arrays.asList("hello", "world", "world", "bar"));
TextMapPropagator prop = new MultiTextMapPropagator(propagator1, propagator2);
Collection<String> fields = prop.fields();
assertThat(fields).containsExactly("foo", "bar", "hello", "world");
}
@Test
void fields_readOnly() {
when(propagator1.fields()).thenReturn(Arrays.asList("rubber", "baby"));
when(propagator2.fields()).thenReturn(Arrays.asList("buggy", "bumpers"));
TextMapPropagator prop = new MultiTextMapPropagator(propagator1, propagator2);
Collection<String> fields = prop.fields();
assertThatThrownBy(() -> fields.add("hi")).isInstanceOf(UnsupportedOperationException.class);
}
@Test
void inject_allDelegated() {
Map<String, String> carrier = new HashMap<>();
Context context = mock(Context.class);
TextMapSetter<Map<String, String>> setter = Map::put;
TextMapPropagator prop = new MultiTextMapPropagator(propagator1, propagator2, propagator3);
prop.inject(context, carrier, setter);
verify(propagator1).inject(context, carrier, setter);
verify(propagator2).inject(context, carrier, setter);
verify(propagator3).inject(context, carrier, setter);
}
@Test
void extract_noPropagators() {
Map<String, String> carrier = new HashMap<>();
Context context = mock(Context.class);
TextMapPropagator prop = new MultiTextMapPropagator();
Context resContext = prop.extract(context, carrier, getter);
assertThat(context).isSameAs(resContext);
}
@Test
void extract_found_all() {
Map<String, String> carrier = new HashMap<>();
TextMapPropagator prop = new MultiTextMapPropagator(propagator1, propagator2, propagator3);
Context context1 = mock(Context.class);
Context context2 = mock(Context.class);
Context context3 = mock(Context.class);
Context expectedContext = mock(Context.class);
when(propagator1.extract(context1, carrier, getter)).thenReturn(context2);
when(propagator2.extract(context2, carrier, getter)).thenReturn(context3);
when(propagator3.extract(context3, carrier, getter)).thenReturn(expectedContext);
assertThat(prop.extract(context1, carrier, getter)).isEqualTo(expectedContext);
}
@Test
void extract_notFound() {
Map<String, String> carrier = new HashMap<>();
Context context = mock(Context.class);
when(propagator1.extract(context, carrier, getter)).thenReturn(context);
when(propagator2.extract(context, carrier, getter)).thenReturn(context);
TextMapPropagator prop = new MultiTextMapPropagator(propagator1, propagator2);
Context result = prop.extract(context, carrier, getter);
assertThat(result).isSameAs(context);
}
@Test
void extract_nullContext() {
assertThat(
new MultiTextMapPropagator(propagator1, propagator2)
.extract(null, Collections.emptyMap(), getter))
.isSameAs(Context.root());
}
@Test
void extract_nullGetter() {
Context context = Context.current().with(KEY, "treasure");
assertThat(
new MultiTextMapPropagator(propagator1, propagator2)
.extract(context, Collections.emptyMap(), null))
.isSameAs(context);
}
@Test
void inject_nullContext() {
Map<String, String> carrier = new LinkedHashMap<>();
new MultiTextMapPropagator(propagator1, propagator2).inject(null, carrier, Map::put);
assertThat(carrier).isEmpty();
}
@Test
void inject_nullSetter() {
Map<String, String> carrier = new LinkedHashMap<>();
Context context = Context.current().with(KEY, "treasure");
new MultiTextMapPropagator(propagator1, propagator2).inject(context, carrier, null);
assertThat(carrier).isEmpty();
}
@Test
void toString_Valid() {
assertThat(new MultiTextMapPropagator(propagator1, propagator2).toString())
.isEqualTo("MultiTextMapPropagator{textMapPropagators=[propagator1, propagator2]}");
}
}