How to add multiple expect calls in a loop - c++

Question

I'm trying to test a function using gtest. Here is the pseudo-code:
**Function to Test:**
void ClassAdd::Display(int num) {
for (int n = 1; n <= num; ++num) {
status = ClassInterface_.Function1(...);
...
for (int i = 1; i <= 5; i++) {
status = ClassInterface_.Function2(...);
...
}
for (int j = 1; j <= 3; j++) {
status = ClassInterface_.Function3(...);
...
}
}
}
**Test Code:**
TEST(Test, TestName) {
InSequence s;
for (int num = 1; num < 3; ++num) {
EXPECT_CALL(*(mockClassInterface_.get()), Function1(_))
.WillOnce(Return(true));
EXPECT_CALL(*(mockClassInterface_.get()), Function2(_, _))
.WillRepeatedly(Return(true));
EXPECT_CALL(*(mockClassInterface_.get()), Function3(_, _, _, _))
.WillRepeatedly(Return(true));
}
ClassAdd* test1 = new ClassAdd();
ASSERT_TRUE(test1->Display(3));
}
I know why it is not working. It expects Function1 followed by Function2 and Function3. But in the next iteration, EXPECT_CALL is not being called and returns false by default. Hence, the test is failing. Here is the error I see when I run:
tried expectation #0: EXPECT_CALL(*(mockClassInterface_.get()), Function1(_))
Expected: the expectation is active
Actual: it is retired
Expected: to be called any number of times
Actual: never called - satisfied and retired
Any tips on how to achieve this?

Answer 1

I suggest you read this link, especially the section "Using Mocks in Tests"
From what I understand of your pseudo-code, you have a Display function that calls Function1, Function2 and Function3 a certain amount of time.
To test that these functions are correctly called, and to add a return value, you should rather use the "Times" function.
For instance:
EXPECT_CALL(*(mockClassInterface_.get()), Function1(_)).Times(3).WillRepeatedly(Return(true));
This call means "I want the Function1 function to be called 3 times with any parameter, and it shall always return true".
Also note that by using Times, you don't need to use a for loop to define your EXPECT_CALL expectations.