when(configurationHelper.fromFile("path")).thenReturn(config);
ForApiBuilder builder = new ClientLoginTokens.ForApiBuilder(
configurationHelper, clientLogin, ClientLoginTokens.Api.DFP);
ClientLoginTokens clientLoginTokens = builder.fromFile("path").build();
assertEquals(clientLoginTokens.clientLogin.getUsername(), "email");
assertEquals(clientLoginTokens.clientLogin.getPassword(), "password");
assertEquals(clientLoginTokens.clientLogin.getAuthTokenType(),
ClientLoginTokens.Api.DFP.getService());