[英]How do I write a unit-test to throw an exception from the Mock method of Operation return type?
I would like to write a unit-test to throw an exception from the Mock method of Operation return type. 我想编写一个单元测试,以从Operation返回类型的Mock方法引发异常。
I'm writing the unit-test with Spock in Groovy. 我正在Groovy中用Spock编写单元测试。
There are class A, and B 有A类和B类
// class A
private ClassB b;
Promise<String> foo() {
return b.methodX()
.nextOp(s -> {
return b.methodY();
});
}
Return type of methodP()
is Promise<>
Return type of methodO()
is Operation
methodP()
返回类型为Promise<>
methodO()
返回类型为Operation
// class B
public Promise<String> methodP() {
return Promise.value("abc");
}
public Operation methodO() {
return Operation.noop();
}
Unit-test for foo() method of Class A Mocking ClassB in the unit-test 单元测试中A类模拟ClassB的foo()方法的单元测试
// Spock unit-test
ClassA a = new ClassA()
ClassB b = Mock()
def 'unit test'() {
given:
when:
execHarness.yield {
a.foo()
}.valueOrThrow
then:
1 * b.methodP() >> Promise.value("some-string")
1 * b.methodO() >> new Exception("my-exception")
Exception e = thrown(Exception)
e.getMessage() == "my-exception"
}
I expected the Exception is thrown, but GroovyCaseException was thrown and test failed. 我预计会引发异常,但会引发GroovyCaseException且测试失败。
Error message says, 错误消息说,
org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'java.lang.Exception: my-exception' with class 'java.lang.Exception' to class 'ratpack.exec.Operation'
Change this line: 更改此行:
1 * b.methodO() >> new Exception("my-exception")
on: 上:
1 * b.methodO() >> { throw new Exception("my-exception") }
Because methodO()
is not expected to return Exception
instance (as in your example) but it is expected to be thrown (by using closure). 因为不希望methodO()
返回 Exception
实例(如您的示例),但methodO()
其抛出 (通过使用闭包)。
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