Return error on no-browser option if repo don't exists

pkg/cmd/browse/browse.go

@@ -180,7 +180,19 @@ func runBrowse(opts *BrowseOptions) error {
 	url := ghrepo.GenerateRepoURL(baseRepo, "%s", section)
 
 	if opts.NoBrowserFlag {
-		_, err := fmt.Fprintln(opts.IO.Out, url)
+		client, err := opts.HttpClient()
+		if err != nil {
+			return err
+		}
+
+		exist, err := api.RepoExists(api.NewClientFromHTTP(client), baseRepo)
+		if err != nil {
+			return err
+		}
+		if !exist {
+			return fmt.Errorf("%s doesn't exists", text.DisplayURL(url))
+		}
+		_, err = fmt.Fprintln(opts.IO.Out, url)
 		return err
 	}
 

pkg/cmd/browse/browse_test.go

@@ -232,6 +232,7 @@ func Test_runBrowse(t *testing.T) {
 	tests := []struct {
 		name          string
 		opts          BrowseOptions
+		httpStub      func(*httpmock.Registry)
 		baseRepo      ghrepo.Interface
 		defaultBranch string
 		expectedURL   string
@@ -432,6 +433,12 @@ func Test_runBrowse(t *testing.T) {
 				SelectorArg:   "init.rb:6",
 				NoBrowserFlag: true,
 			},
+			httpStub: func(r *httpmock.Registry) {
+				r.Register(
+					httpmock.REST("HEAD", "repos/mislav/will_paginate"),
+					httpmock.StringResponse("{}"),
+				)
+			},
 			baseRepo:    ghrepo.New("mislav", "will_paginate"),
 			wantsErr:    false,
 			expectedURL: "https://github.com/mislav/will_paginate/blob/3-0-stable/init.rb?plain=1#L6",
@@ -556,6 +563,10 @@ func Test_runBrowse(t *testing.T) {
 				reg.StubRepoInfoResponse(tt.baseRepo.RepoOwner(), tt.baseRepo.RepoName(), tt.defaultBranch)
 			}
 
+			if tt.httpStub != nil {
+				tt.httpStub(&reg)
+			}
+
 			opts := tt.opts
 			opts.IO = ios
 			opts.BaseRepo = func() (ghrepo.Interface, error) {