Add support for Pages Preview API GetPageBuild for getting single specific page build

Closes #415.
Closes #447.

Change-Id: I36d64eb59d494afcc872a04a1da9e0b11f396e46

github/repos_pages.go

@@ -36,7 +36,7 @@ type PagesBuild struct {
 // GetPagesInfo fetches information about a GitHub Pages site.
 //
 // GitHub API docs: https://developer.github.com/v3/repos/pages/#get-information-about-a-pages-site
-func (s *RepositoriesService) GetPagesInfo(owner string, repo string) (*Pages, *Response, error) {
+func (s *RepositoriesService) GetPagesInfo(owner, repo string) (*Pages, *Response, error) {
 	u := fmt.Sprintf("repos/%v/%v/pages", owner, repo)
 	req, err := s.client.NewRequest("GET", u, nil)
 	if err != nil {
@@ -58,7 +58,7 @@ func (s *RepositoriesService) GetPagesInfo(owner string, repo string) (*Pages, *
 // ListPagesBuilds lists the builds for a GitHub Pages site.
 //
 // GitHub API docs: https://developer.github.com/v3/repos/pages/#list-pages-builds
-func (s *RepositoriesService) ListPagesBuilds(owner string, repo string) ([]*PagesBuild, *Response, error) {
+func (s *RepositoriesService) ListPagesBuilds(owner, repo string) ([]*PagesBuild, *Response, error) {
 	u := fmt.Sprintf("repos/%v/%v/pages/builds", owner, repo)
 	req, err := s.client.NewRequest("GET", u, nil)
 	if err != nil {
@@ -77,7 +77,7 @@ func (s *RepositoriesService) ListPagesBuilds(owner string, repo string) ([]*Pag
 // GetLatestPagesBuild fetches the latest build information for a GitHub pages site.
 //
 // GitHub API docs: https://developer.github.com/v3/repos/pages/#list-latest-pages-build
-func (s *RepositoriesService) GetLatestPagesBuild(owner string, repo string) (*PagesBuild, *Response, error) {
+func (s *RepositoriesService) GetLatestPagesBuild(owner, repo string) (*PagesBuild, *Response, error) {
 	u := fmt.Sprintf("repos/%v/%v/pages/builds/latest", owner, repo)
 	req, err := s.client.NewRequest("GET", u, nil)
 	if err != nil {
@@ -93,10 +93,29 @@ func (s *RepositoriesService) GetLatestPagesBuild(owner string, repo string) (*P
 	return build, resp, err
 }
 
+// GetPageBuild fetches the specific build information for a GitHub pages site.
+//
+// GitHub API docs: https://developer.github.com/v3/repos/pages/#list-a-specific-pages-build
+func (s *RepositoriesService) GetPageBuild(owner, repo string, id int) (*PagesBuild, *Response, error) {
+	u := fmt.Sprintf("repos/%v/%v/pages/builds/%v", owner, repo, id)
+	req, err := s.client.NewRequest("GET", u, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	build := new(PagesBuild)
+	resp, err := s.client.Do(req, build)
+	if err != nil {
+		return nil, resp, err
+	}
+
+	return build, resp, err
+}
+
 // RequestPageBuild requests a build of a GitHub Pages site without needing to push new commit.
 //
 // GitHub API docs: https://developer.github.com/v3/repos/pages/#request-a-page-build
-func (s *RepositoriesService) RequestPageBuild(owner string, repo string) (*PagesBuild, *Response, error) {
+func (s *RepositoriesService) RequestPageBuild(owner, repo string) (*PagesBuild, *Response, error) {
 	u := fmt.Sprintf("repos/%v/%v/pages/builds", owner, repo)
 	req, err := s.client.NewRequest("POST", u, nil)
 	if err != nil {

github/repos_pages_test.go

@@ -73,6 +73,26 @@ func TestRepositoriesService_GetLatestPagesBuild(t *testing.T) {
 	}
 }
 
+func TestRepositoriesService_GetPageBuild(t *testing.T) {
+	setup()
+	defer teardown()
+
+	mux.HandleFunc("/repos/o/r/pages/builds/1", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		fmt.Fprint(w, `{"url":"u","status":"s","commit":"c"}`)
+	})
+
+	build, _, err := client.Repositories.GetPageBuild("o", "r", 1)
+	if err != nil {
+		t.Errorf("Repositories.GetPageBuild returned error: %v", err)
+	}
+
+	want := &PagesBuild{URL: String("u"), Status: String("s"), Commit: String("c")}
+	if !reflect.DeepEqual(build, want) {
+		t.Errorf("Repositories.GetPageBuild returned %+v, want %+v", build, want)
+	}
+}
+
 func TestRepositoriesService_RequestPageBuild(t *testing.T) {
 	setup()
 	defer teardown()