使用 Mockito,如何与地图的键值对进行匹配?
我需要根据特定的键值从模拟对象发送特定值。
从具体类:
map.put("xpath", "PRICE");
search(map);
从测试用例中:
IOurXMLDocument mock = mock(IOurXMLDocument.class);
when(mock.search(.....need help here).thenReturn("$100.00");
如何模拟此键值对的此方法调用?
我需要根据特定的键值从模拟对象发送特定值。
从具体类:
map.put("xpath", "PRICE");
search(map);
从测试用例中:
IOurXMLDocument mock = mock(IOurXMLDocument.class);
when(mock.search(.....need help here).thenReturn("$100.00");
如何模拟此键值对的此方法调用?
我发现这试图解决使用Map参数创建Mockito存根的类似问题。我不想为有问题的地图编写自定义匹配器,然后我发现了一个更优雅的解决方案:将hamcrest库中的附加匹配器与mockito的argThat一起使用:
when(mock.search(argThat(hasEntry("xpath", "PRICE"))).thenReturn("$100.00");
如果您需要检查多个条目,则可以使用其他hamcrest好东西:
when(mock.search(argThat(allOf(hasEntry("xpath", "PRICE"), hasEntry("otherKey", "otherValue")))).thenReturn("$100.00");
对于非平凡的地图来说,这开始变得很长,所以我最终提取了收集条目匹配器的方法,并将它们粘贴到我们的TestUtils中:
import static org.hamcrest.Matchers.allOf;
import static org.hamcrest.Matchers.anyOf;
import static org.hamcrest.Matchers.hasEntry;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.hamcrest.Matcher;
---------------------------------
public static <K, V> Matcher<Map<K, V>> matchesEntriesIn(Map<K, V> map) {
return allOf(buildMatcherArray(map));
}
public static <K, V> Matcher<Map<K, V>> matchesAnyEntryIn(Map<K, V> map) {
return anyOf(buildMatcherArray(map));
}
@SuppressWarnings("unchecked")
private static <K, V> Matcher<Map<? extends K, ? extends V>>[] buildMatcherArray(Map<K, V> map) {
List<Matcher<Map<? extends K, ? extends V>>> entries = new ArrayList<Matcher<Map<? extends K, ? extends V>>>();
for (K key : map.keySet()) {
entries.add(hasEntry(key, map.get(key)));
}
return entries.toArray(new Matcher[entries.size()]);
}
所以我剩下:
when(mock.search(argThat(matchesEntriesIn(map))).thenReturn("$100.00");
when(mock.search(argThat(matchesAnyEntryIn(map))).thenReturn("$100.00");
泛型有一些丑陋,我正在抑制一个警告,但至少它是干燥的,隐藏在TestUtil中。
最后要注意的是,当心 JUnit 4.10 中嵌入的 hamcrest 问题。对于 Maven,我建议先导入 hamcrest-library,然后再导入 JUnit 4.11(现在是 4.12),并从 JUnit 中排除 hamcrest-core 只是为了更好的措施:
<dependency>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-library</artifactId>
<version>1.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.hamcrest</groupId>
<artifactId>hamcrest-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-all</artifactId>
<version>1.9.5</version>
<scope>test</scope>
</dependency>
编辑:2017年9月1日 - 根据一些评论,我更新了我的答案,以显示我的Mockito依赖性,我在测试实用程序中的导入以及截至今天运行绿色的junit:
import static blah.tool.testutil.TestUtil.matchesAnyEntryIn;
import static blah.tool.testutil.TestUtil.matchesEntriesIn;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.mockito.Matchers.argThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
public class TestUtilTest {
@Test
public void test() {
Map<Integer, String> expected = new HashMap<Integer, String>();
expected.put(1, "One");
expected.put(3, "Three");
Map<Integer, String> actual = new HashMap<Integer, String>();
actual.put(1, "One");
actual.put(2, "Two");
assertThat(actual, matchesAnyEntryIn(expected));
expected.remove(3);
expected.put(2, "Two");
assertThat(actual, matchesEntriesIn(expected));
}
@Test
public void mockitoTest() {
SystemUnderTest sut = mock(SystemUnderTest.class);
Map<Integer, String> expected = new HashMap<Integer, String>();
expected.put(1, "One");
expected.put(3, "Three");
Map<Integer, String> actual = new HashMap<Integer, String>();
actual.put(1, "One");
when(sut.search(argThat(matchesAnyEntryIn(expected)))).thenReturn("Response");
assertThat(sut.search(actual), is("Response"));
}
protected class SystemUnderTest {
// We don't really care what this does
public String search(Map<Integer, String> map) {
if (map == null) return null;
return map.get(0);
}
}
}
如果您只想与特定的Map“匹配”,则可以使用上面的一些答案,或者扩展Map<X,Y>的自定义“匹配器”对象或ArsignCaptor,如下所示:
ArgumentCaptor<Map> argumentsCaptured = ArgumentCaptor.forClass(Map.class);
verify(mock, times(1)).method((Map<String, String>) argumentsCaptured.capture());
assert argumentsCaptured.getValue().containsKey("keynameExpected");
// argumentsCaptured.getValue() will be the first Map it called it with.
// argumentsCaptured.getAllValues() if it was called more than times(1)
在此处查看更多答案:使用 mockito 验证对象属性值
如果要捕获多个地图:
ArgumentCaptor<Map> argumentsCaptured = ArgumentCaptor.forClass(Map.class);
ArgumentCaptor<Map> argumentsCaptured2 = ArgumentCaptor.forClass(Map.class);
verify(mock, times(1)).method(argumentsCaptured.capture(), argumentsCaptured2.capture());
assert argumentsCaptured.getValue().containsKey("keynameExpected");
assert argumentsCaptured2.getValue().containsKey("keynameExpected2");
....