func testGetCredential(t *testing.T, cp common.CredentialProvider, tc *testCase) {
actual, actualErr := cp.GetCredential(tc.name)
if !reflect.DeepEqual(actual, tc.exp) {
t.Fatalf("failed on: %s : expected %#v but got %#v", tc.name, tc.exp, actual)
}
if !reflect.DeepEqual(actualErr, tc.expErr) {
t.Fatalf("failed on: %s : expected error %#v but got %#v", tc.name, tc.expErr, actualErr)
}
}
