diff --git a/tests/index.js b/tests/index.js
index 618a5e70..60b522b6 100644
--- a/tests/index.js
+++ b/tests/index.js
@@ -4,6 +4,7 @@ var test = require('tape')
 
 var createModule = require('./lib/create-module')
 
+require('./scenarios/custom-analyzer')(test, createModule)
 require('./scenarios/ignore')(test, createModule)
 require('./scenarios/prepublish')(test, createModule)
 require('./scenarios/postpublish')(test, createModule)
diff --git a/tests/lib/commit-to-version-test.js b/tests/lib/commit-to-version-test.js
new file mode 100644
index 00000000..f087ddcc
--- /dev/null
+++ b/tests/lib/commit-to-version-test.js
@@ -0,0 +1,37 @@
+'use strict'
+
+var fs = require('fs')
+var exec = require('child_process').exec
+
+var nixt = require('nixt')
+
+module.exports = function (t, message, version, code, name, cwd) {
+  t.test(name, function (t) {
+    t.plan(3)
+
+    nixt()
+      .cwd(cwd)
+      .env('CI', true)
+      .env('npm_config_registry', 'http://127.0.0.1:4873/')
+      .exec('git commit --allow-empty -m "' + message + '"')
+      .run('npm run prepublish')
+      .code(code)
+      .stdout(/> semantic-release pre\n\nDetermining new version\n/m)
+      .end(function (err) {
+        t.error(err, 'nixt')
+
+        var pkg = JSON.parse(fs.readFileSync(cwd + '/package.json'))
+        t.is(pkg.version, version, 'version')
+
+        if (code === 1) {
+          return t.error(null, 'no publish')
+        }
+
+        exec('npm publish --ignore-scripts', {cwd: cwd}, function (err) {
+          setTimeout(function () {
+            t.error(err, 'publish')
+          }, 300)
+        })
+      })
+  })
+}
diff --git a/tests/lib/custom-analyzer.js b/tests/lib/custom-analyzer.js
new file mode 100644
index 00000000..cd548e70
--- /dev/null
+++ b/tests/lib/custom-analyzer.js
@@ -0,0 +1,20 @@
+'use strict'
+
+module.exports = function (commits) {
+  var type = null
+
+  commits.every(function (commit) {
+    if (/FOO/.test(commit.message)) {
+      type = 'major'
+      return false
+    }
+
+    if (/BAR/.test(commit.message)) type = 'minor'
+
+    if (!type && /BAZ/.test(commit.message)) type = 'patch'
+
+    return true
+  })
+
+  return type
+}
diff --git a/tests/scenarios/custom-analyzer.js b/tests/scenarios/custom-analyzer.js
new file mode 100644
index 00000000..d571cb78
--- /dev/null
+++ b/tests/scenarios/custom-analyzer.js
@@ -0,0 +1,23 @@
+'use strict'
+
+var path = require('path')
+
+var efh = require('error-first-handler')
+
+var commitToVersionTest = require('../lib/commit-to-version-test')
+
+module.exports = function (test, createModule) {
+  createModule({
+    release: {
+      analyzer: path.join(__dirname, '../lib/custom-analyzer')
+    }
+  }, efh()(function (name, cwd) {
+    test('custom-analyzer', function (t) {
+      commitToVersionTest(t, 'HO', '0.0.0', 1, 'abort publish w/o changes', cwd)
+      commitToVersionTest(t, 'BAZ', '1.0.0', 0, 'release 1.0.0 if unpublished', cwd)
+      commitToVersionTest(t, 'BAZ', '1.0.1', 0, 'bump patch for fix', cwd)
+      commitToVersionTest(t, 'BAR', '1.1.0', 0, 'bump minor for feature', cwd)
+      commitToVersionTest(t, 'FOO', '2.0.0', 0, 'bump major for breaking change', cwd)
+    })
+  }))
+}
diff --git a/tests/scenarios/prepublish.js b/tests/scenarios/prepublish.js
index 2fdd0e39..22b8e112 100644
--- a/tests/scenarios/prepublish.js
+++ b/tests/scenarios/prepublish.js
@@ -1,50 +1,17 @@
 'use strict'
 
-var fs = require('fs')
-var exec = require('child_process').exec
-
 var efh = require('error-first-handler')
-var nixt = require('nixt')
+
+var commitToVersionTest = require('../lib/commit-to-version-test')
 
 module.exports = function (test, createModule) {
   createModule(efh()(function (name, cwd) {
     test('prepublish', function (t) {
-      prepublishTest(t, 'refactor: change', '0.0.0', 1, 'abort publish w/o changes')
-      prepublishTest(t, 'fix: change', '1.0.0', 0, 'release 1.0.0 if unpublished')
-      prepublishTest(t, 'fix: change', '1.0.1', 0, 'bump patch for fix')
-      prepublishTest(t, 'feat: change', '1.1.0', 0, 'bump minor for feature')
-      prepublishTest(t, 'fix: BREAKING CHANGE: change', '2.0.0', 0, 'bump major for breaking change')
+      commitToVersionTest(t, 'refactor: change', '0.0.0', 1, 'abort publish w/o changes', cwd)
+      commitToVersionTest(t, 'fix: change', '1.0.0', 0, 'release 1.0.0 if unpublished', cwd)
+      commitToVersionTest(t, 'fix: change', '1.0.1', 0, 'bump patch for fix', cwd)
+      commitToVersionTest(t, 'feat: change', '1.1.0', 0, 'bump minor for feature', cwd)
+      commitToVersionTest(t, 'fix: BREAKING CHANGE: change', '2.0.0', 0, 'bump major for breaking change', cwd)
     })
-
-    function prepublishTest (t, message, version, code, name) {
-      t.test(name, function (t) {
-        t.plan(3)
-
-        nixt()
-          .cwd(cwd)
-          .env('CI', true)
-          .env('npm_config_registry', 'http://127.0.0.1:4873/')
-          .exec('git commit --allow-empty -m "' + message + '"')
-          .run('npm run prepublish')
-          .code(code)
-          .stdout(/> semantic-release pre\n\nDetermining new version\n/m)
-          .end(function (err) {
-            t.error(err, 'nixt')
-
-            var pkg = JSON.parse(fs.readFileSync(cwd + '/package.json'))
-            t.is(pkg.version, version, 'version')
-
-            if (code === 1) {
-              return t.error(null, 'no publish')
-            }
-
-            exec('npm publish --ignore-scripts', {cwd: cwd}, function (err) {
-              setTimeout(function () {
-                t.error(err, 'publish')
-              }, 300)
-            })
-          })
-      })
-    }
   }))
 }