testAuthenticateWithTouchID.m

- (void)testAuthenticateWithTouchID {
  id mockLAContext = [OCMockObject mockForClass:[LAContext class]];
  [_authManager setLocalAuthContext:mockLAContext];
  [[mockLAContext expect] setLocalizedFallbackTitle:@"Wealthfront PIN"];
  BOOL boolValue = YES;
  NSError *err = nil;
  
  [[[mockLAContext expect] andDo:^(NSInvocation *i) {
    void(^reply)(BOOL success, NSError *error) = nil;
    [i getArgument:&reply
           atIndex:4];
    reply(boolValue, err);
  }]  evaluatePolicy:LAPolicyDeviceOwnerAuthenticationWithBiometrics
    localizedReason:@"Please authenticate to proceed"
              reply:[OCMArg isNotNil]];
  
  __block BOOL succeeded = NO;
  [_authManager authenticateByTouchIDWithFallbackButtonTitle:@"Wealthfront PIN"
                                                     success:^{
                                                       succeeded = YES;
                                                     } fallback:^(NSError *error){
                                                       XCTFail(@"fallback block should not have been called");
                                                     }];
  XCTAssertTrue(succeeded, @"Should have succeeded");
  XCTAssertNil(_authManager.localAuthContext, @"Should be nil now");

  XCTAssertThrows([_authManager authenticateByTouchIDWithFallbackButtonTitle:nil
                                                                     success:OCMOCK_ANY
                                                                    fallback:OCMOCK_ANY]);
  
  [mockLAContext verify];
}