Test PR create uses commit title and body when only one commit

pkg/cmd/pr/create/create_test.go

@@ -995,6 +995,85 @@ func Test_createRun(t *testing.T) {
 			},
 			expectedOut: "https://github.com/OWNER/REPO/pull/12\n",
 		},
+		{
+			name: "single commit title and body are used",
+			tty:  true,
+			setup: func(opts *CreateOptions, t *testing.T) func() {
+				opts.HeadBranch = "feature"
+				return func() {}
+			},
+			cmdStubs: func(cs *run.CommandStubber) {
+				cs.Register(
+					"git -c log.ShowSignature=false log --pretty=format:%H,%s --cherry origin/master...feature",
+					0,
+					"343jdfe47c9e3a30093cd17e48934ce354148e80,first commit of pr\n\nfirst commit description\n",
+				)
+				cs.Register(
+					"git -c log.ShowSignature=false show -s --pretty=format:%b 343jdfe47c9e3a30093cd17e48934ce354148e80",
+					0,
+					"first commit description",
+				)
+				cs.Register(`git rev-parse --show-toplevel`, 0, "")
+			},
+			promptStubs: func(pm *prompter.PrompterMock) {
+				pm.SelectFunc = func(p, _ string, opts []string) (int, error) {
+					if p == "Where should we push the 'feature' branch?" {
+						return 0, nil
+					} else {
+						return -1, prompter.NoSuchPromptErr(p)
+					}
+				}
+
+				pm.InputFunc = func(p, d string) (string, error) {
+					if p == "Title" {
+						return d, nil
+					} else if p == "Body" {
+						return d, nil
+					} else {
+						return "", prompter.NoSuchPromptErr(p)
+					}
+				}
+
+				pm.MarkdownEditorFunc = func(p, d string, ba bool) (string, error) {
+					if p == "Body" {
+						return d, nil
+					} else {
+						return "", prompter.NoSuchPromptErr(p)
+					}
+				}
+
+				pm.SelectFunc = func(p, _ string, opts []string) (int, error) {
+					if p == "What's next?" {
+						return 0, nil
+					} else {
+						return -1, prompter.NoSuchPromptErr(p)
+					}
+				}
+			},
+			httpStubs: func(reg *httpmock.Registry, t *testing.T) {
+				reg.Register(
+					httpmock.GraphQL(`query PullRequestTemplates\b`),
+					httpmock.StringResponse(`{ "data": { "repository": { "pullRequestTemplates": [] } } }`),
+				)
+				reg.Register(
+					httpmock.GraphQL(`mutation PullRequestCreate\b`),
+					httpmock.GraphQLMutation(`
+						{
+						"data": { "createPullRequest": { "pullRequest": {
+							"URL": "https://github.com/OWNER/REPO/pull/12"
+							} } }
+						}
+						`,
+						func(input map[string]interface{}) {
+							assert.Equal(t, "first commit of pr", input["title"], "pr title should be first commit message")
+							assert.Equal(t, "first commit description", input["body"], "pr body should be first commit description")
+						},
+					),
+				)
+			},
+			expectedOut:    "https://github.com/OWNER/REPO/pull/12\n",
+			expectedErrOut: "\nCreating pull request for feature into master in OWNER/REPO\n\n",
+		},
 		{
 			name: "fill-first flag provided",
 			tty:  true,