public async Task EnsuresNonNullArguments()
            {
                var client = new ObservableRepositoryBranchesClient(Substitute.For<IGitHubClient>());
                var usersToRemove = new BranchProtectionUserCollection() { "test" };

                Assert.Throws<ArgumentNullException>(() => client.DeleteProtectedBranchUserRestrictions(null, "repo", "branch", usersToRemove));
                Assert.Throws<ArgumentNullException>(() => client.DeleteProtectedBranchUserRestrictions("owner", null, "branch", usersToRemove));
                Assert.Throws<ArgumentNullException>(() => client.DeleteProtectedBranchUserRestrictions("owner", "repo", null, usersToRemove));
                Assert.Throws<ArgumentNullException>(() => client.DeleteProtectedBranchUserRestrictions("owner", "repo", "branch", null));

                Assert.Throws<ArgumentNullException>(() => client.DeleteProtectedBranchUserRestrictions(1, null, usersToRemove));
                Assert.Throws<ArgumentNullException>(() => client.DeleteProtectedBranchUserRestrictions(1, "branch", null));

                Assert.Throws<ArgumentException>(() => client.DeleteProtectedBranchUserRestrictions("", "repo", "branch", usersToRemove));
                Assert.Throws<ArgumentException>(() => client.DeleteProtectedBranchUserRestrictions("owner", "", "branch", usersToRemove));
                Assert.Throws<ArgumentException>(() => client.DeleteProtectedBranchUserRestrictions("owner", "repo", "", usersToRemove));

                Assert.Throws<ArgumentException>(() => client.DeleteProtectedBranchUserRestrictions(1, "", usersToRemove));
            }
            public void RequestsTheCorrectUrlWithRepositoryId()
            {
                var gitHubClient = Substitute.For<IGitHubClient>();
                var client = new ObservableRepositoryBranchesClient(gitHubClient);
                var usersToRemove = new BranchProtectionUserCollection() { "test" };

                client.DeleteProtectedBranchUserRestrictions(1, "branch", usersToRemove);

                gitHubClient.Repository.Branch.Received()
                    .DeleteProtectedBranchUserRestrictions(1, "branch", usersToRemove);
            }