fix: allow empty release notes in dry-run mode

SUMMARY.md

@@ -21,6 +21,8 @@
 	- [Travis CI](docs/recipes/travis.md)
 	- [Travis CI with build stages](docs/recipes/travis-build-stages.md)
 	- [GitLab CI](docs/recipes/gitlab-ci.md)
+- [Git hosted services](docs/recipes/README.md)
+	- [Git authentication with SSH keys](docs/recipes/git-auth-ssh-keys.md)
 - [Package managers and languages](docs/recipes/README.md)
 
 ## Developer guide

index.js

@@ -103,7 +103,9 @@ async function run(options, plugins) {
     logger.log('Call plugin %s', 'generate-notes');
     const notes = await plugins.generateNotes(generateNotesParam);
     logger.log('Release note for version %s:\n', nextRelease.version);
-    process.stdout.write(`${marked(notes)}\n`);
+    if (notes) {
+      process.stdout.write(`${marked(notes)}\n`);
+    }
   } else {
     logger.log('Call plugin %s', 'generateNotes');
     nextRelease.notes = await plugins.generateNotes(generateNotesParam);

package.json

@@ -35,7 +35,7 @@
     "git-log-parser": "^1.2.0",
     "git-url-parse": "^9.0.0",
     "hook-std": "^1.0.1",
-    "hosted-git-info": "^2.6.0",
+    "hosted-git-info": "^2.7.1",
     "lodash": "^4.17.4",
     "marked": "^0.4.0",
     "marked-terminal": "^3.0.0",

test/index.test.js

@@ -520,6 +520,43 @@ test.serial('Force a dry-run if not on a CI and "noCi" is not explicitly set', a
   t.is(success.callCount, 0);
 });
 
+test.serial('Dry-run does not print changelog if "generateNotes" return "undefined"', async t => {
+  // Create a git repository, set the current working directory at the root of the repo
+  const repositoryUrl = await gitRepo(true);
+  // Add commits to the master branch
+  await gitCommits(['First']);
+  // Create the tag corresponding to version 1.0.0
+  await gitTagVersion('v1.0.0');
+  // Add new commits to the master branch
+  await gitCommits(['Second']);
+  await gitPush();
+
+  const nextRelease = {type: 'major', version: '2.0.0', gitHead: await getGitHead(), gitTag: 'v2.0.0'};
+  const analyzeCommits = stub().resolves(nextRelease.type);
+  const generateNotes = stub().resolves();
+
+  const options = {
+    dryRun: true,
+    branch: 'master',
+    repositoryUrl,
+    verifyConditions: false,
+    analyzeCommits,
+    verifyRelease: false,
+    generateNotes,
+    prepare: false,
+    publish: false,
+    success: false,
+  };
+
+  const semanticRelease = proxyquire('..', {
+    './lib/logger': t.context.logger,
+    'env-ci': () => ({isCi: true, branch: 'master', isPr: false}),
+  });
+  t.truthy(await semanticRelease(options));
+
+  t.deepEqual(t.context.log.args[t.context.log.args.length - 1], ['Release note for version %s:\n', '2.0.0']);
+});
+
 test.serial('Allow local releases with "noCi" option', async t => {
   // Create a git repository, set the current working directory at the root of the repo
   const repositoryUrl = await gitRepo(true);