[英]How to mock an Elasticsearch Java Client?
您知道如何適當地模擬 Elasticsearch Java 客戶端嗎? 目前在 Java 中模擬以下請求:
SearchResponse response = client.prepareSearch(index)
.setTypes(type)
.setFrom(0).setSize(MAX_SIZE)
.execute()
.actionGet();
SearchHit[] hits = response.getHits().getHits();
我必須嘲笑:
所以我的測試看起來像:
SearchHit[] hits = ..........;
SearchHits searchHits = mock(SearchHits.class);
when(searchHits.getHits()).thenReturn(hits);
SearchResponse response = mock(SearchResponse.class);
when(response.getHits()).thenReturn(searchHits);
ListenableActionFuture<SearchResponse> action = mock(ListenableActionFuture.class);
when(action.actionGet()).thenReturn(response);
SearchRequestBuilder builder = mock(SearchRequestBuilder.class);
when(builder.setTypes(anyString())).thenReturn(builder);
when(builder.setFrom(anyInt())).thenReturn(builder);
when(builder.setSize(anyInt())).thenReturn(builder);
when(builder.execute()).thenReturn(action);
when(client.prepareSearch(index)).thenReturn(builder);
丑...所以我想知道是否有更“優雅的方式”來模擬這段代碼。
謝謝
我在模擬構建器時遇到了類似的問題,所以我想我會嘗試看看是否有更好的方法。
正如 Spoon 先生所說,如果您一開始就可以避免這樣做可能會更好,因為它不是您的代碼,並且可以被假定為“正常工作”,但我想無論如何我都會試一試。
通過在 Mockito 中使用“默認答案”,我想出了一種(可能是粗略的)方法。 我還在決定我是否喜歡它。
這是我的建設者...
public class MyBuilder {
private StringBuilder my;
public MyBuilder() {
my = new StringBuilder();
}
public MyBuilder name(String name) {
my.append("[name=").append(name).append("]");
return this;
}
public MyBuilder age(String age) {
my.append("[age=").append(age).append("]");
return this;
}
public String create() {
return my.toString();
}
}
(很基本的吧?)
我的測試看起來像這樣......
// Create a "BuilderMocker" (any better name suggestions welcome!)
BuilderMocker<MyBuilder> mocker = BuilderMocker.forClass(MyBuilder.class);
// Get the actual mock builder
MyBuilder builder = mocker.build();
// expect this chain of method calls...
mocker.expect().name("[NAME]").age("[AGE]");
// expect this end-of-chain method call...
Mockito.when(builder.create()).thenReturn("[ARGH!]");
現在,如果我執行以下操作...
System.out.println(builder.name("[NAME]").age("[AGE]").create());
...我希望輸出“[ARGH!]”。
如果我更改了最后一行...
System.out.println(builder.name("[NOT THIS NAME]").age("[AGE]").create());
...然后我希望它會因 NullPointerException 而中斷。
這是實際的“BuilderMocker”...
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.mockito.Mockito.withSettings;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
public class BuilderMocker<T> {
private Class<T> clazz;
private T recorder;
private T mock;
// Create a BuilderMocker for the class
public static <T> BuilderMocker<T> forClass(Class<T> clazz) {
return new BuilderMocker<T>(clazz);
}
private BuilderMocker(Class<T> clazz) {
this.clazz = clazz;
this.mock = mock(clazz);
createRecorder();
}
// Sets up the "recorder"
private void createRecorder() {
recorder = mock(clazz, withSettings().defaultAnswer(new Answer<Object>() {
@Override
public Object answer(InvocationOnMock invocation) throws Throwable {
// If it is a chained method...
if (invocation.getMethod().getReturnType().equals(clazz)) {
// Set expectation on the "real" mock...
when(invocation.getMethod().invoke(mock, invocation.getArguments())).thenReturn(mock);
return recorder;
}
return null;
}
}));
}
// Use this to "record" the expected method chain
public T expect() {
return recorder;
}
// Use this to get the "real" mock...
public T build() {
return mock;
}
}
不確定在 Mockito 中是否有“內置”的方式來做到這一點,但這似乎有效。
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