tests/thirdparty: add skip option (#228)

Add the ability to skip third-party tests by specifying a known issue.

internal/github/client_test.go

@@ -25,3 +25,20 @@ func TestClientRepository(t *testing.T) {
 	}
 	t.Logf("repository = %s", j)
 }
+
+func TestClientIssue(t *testing.T) {
+	test.RequiresNetwork(t)
+
+	ctx := context.Background()
+	g := NewClient(WithHTTPClient(http.DefaultClient), WithTokenFromEnvironment())
+	r, err := g.Issue(ctx, "octocat", "hello-world", 42)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	j, err := json.MarshalIndent(r, "", "\t")
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Logf("issue = %s", j)
+}