Google Cloud IAM C++ Client  1.32.1
A C++ Client Library for Google Cloud IAM
Testing your Cloud IAM Credentials application with googlemock

This document describes how to test your own Cloud IAM application using the Cloud IAM C++ client library, Google Test and the Google Test Mocking Framework.

Mocking a Successful IAMCredentialsClient::SignJwt() call

First include the headers for the Cloud IAM Credentials Client, the mocking class, and the Google Mock framework:

The example uses a number of aliases to save typing and improve readability:

using ::google::cloud::iam_mocks::MockIAMCredentialsConnection;
namespace iam = ::google::cloud::iam;

Create a mocking object for google::cloud::iam::IAMCredentialsConnection:

auto mock = std::make_shared<MockIAMCredentialsConnection>();

It is customary to first setup the expectations for your mock, and then write the rest of the code:

EXPECT_CALL(*mock, SignJwt)
.WillOnce(
[&](google::iam::credentials::v1::SignJwtRequest const& request) {
EXPECT_EQ("projects/-/serviceAccounts/test-account-unique-id",
request.name());
google::iam::credentials::v1::SignJwtResponse response;
response.set_key_id("test-key-id");
return google::cloud::StatusOr<
google::iam::credentials::v1::SignJwtResponse>(response);
});

With the expectations in place, create a google::cloud::iam::IAMCredentialsClient object:

iam::IAMCredentialsClient iam_credentials_client(mock);
A service account is a special type of Google account that belongs to your application or a virtual m...

And then make calls on the client as usual:

std::string payload;
auto response = iam_credentials_client.SignJwt(
"projects/-/serviceAccounts/test-account-unique-id", {}, payload);

And then verify the results meet your expectations:

EXPECT_TRUE(response.ok());
EXPECT_EQ("test-key-id", response->key_id());

Full Listing

Finally we present the full code for this example:

#include <gmock/gmock.h>
namespace {
using ::google::cloud::iam_mocks::MockIAMCredentialsConnection;
namespace iam = ::google::cloud::iam;
TEST(MockSignJwtExample, SignJwt) {
auto mock = std::make_shared<MockIAMCredentialsConnection>();
EXPECT_CALL(*mock, SignJwt)
.WillOnce(
[&](google::iam::credentials::v1::SignJwtRequest const& request) {
EXPECT_EQ("projects/-/serviceAccounts/test-account-unique-id",
request.name());
google::iam::credentials::v1::SignJwtResponse response;
response.set_key_id("test-key-id");
return google::cloud::StatusOr<
google::iam::credentials::v1::SignJwtResponse>(response);
});
iam::IAMCredentialsClient iam_credentials_client(mock);
std::string payload;
auto response = iam_credentials_client.SignJwt(
"projects/-/serviceAccounts/test-account-unique-id", {}, payload);
EXPECT_TRUE(response.ok());
EXPECT_EQ("test-key-id", response->key_id());
}
} // namespace