test(config): include tests for config loading

action/lib/config.js

@@ -8,21 +8,21 @@ import yaml from 'js-yaml'
 
 // default value is passed from workflow
 export default function ({ workspace, inputs }) {
-  const configPath = path.join(workspace, inputs.config)
-
-  let config
+  const configPath = path.join(workspace || '', inputs.config || '.github/auto-merge.yml')
 
   // read auto-merge.yml to determine what should be merged
   if (fs.existsSync(configPath)) {
     // parse .github/auto-merge.yml
     const configYaml = fs.readFileSync(configPath, 'utf8')
-    config = yaml.safeLoad(configYaml)
+    const config = yaml.safeLoad(configYaml)
     core.info('loaded merge config: \n' + configYaml)
-  } else {
-    // or convert the input "target" to the equivalent config
-    config = [{ match: { dependency_type: 'all', update_type: `semver:${inputs.target}` } }]
-    core.info('using workflow\'s "target": \n' + yaml.safeDump(config))
+
+    return config
   }
 
+  // or convert the input "target" to the equivalent config
+  const config = [{ match: { dependency_type: 'all', update_type: `semver:${inputs.target}` } }]
+  core.info('using workflow\'s "target": \n' + yaml.safeDump(config))
+
   return config
 }

action/test/fixtures/.github/auto-merge.yml

@@ -0,0 +1 @@
+../config-valid.yml

action/test/fixtures/config-valid.yml

@@ -0,0 +1,3 @@
+- match:
+    dependency_type: development
+    update_type: semver:minor

action/test/parse/config-load.js

@@ -0,0 +1,58 @@
+// packages
+import tap from 'tap'
+import sinon from 'sinon'
+
+import core from '@actions/core'
+
+// module
+import config from '../../lib/config.js'
+
+import path from 'path'
+const __dirname = path.resolve()
+
+const workspace = `${__dirname}/test/fixtures/`
+
+tap.test('input.config --> default', async assert => {
+  assert.plan(2)
+
+  sinon.stub(core, 'info') // silence output on terminal
+
+  const expected = [{ match: { dependency_type: 'development', update_type: 'semver:minor' } }]
+
+  const result = config({ workspace, inputs: { } })
+
+  assert.match(core.info.getCall(-1)?.firstArg, 'loaded merge config')
+  assert.match(result, expected)
+
+  core.info.restore()
+})
+
+tap.test('input.config --> custom', async assert => {
+  assert.plan(2)
+
+  sinon.stub(core, 'info') // silence output on terminal
+
+  const expected = [{ match: { dependency_type: 'development', update_type: 'semver:minor' } }]
+
+  const result = config({ workspace, inputs: { config: 'config-valid.yml' } })
+
+  assert.match(core.info.getCall(-1)?.firstArg, 'loaded merge config')
+  assert.match(result, expected)
+
+  core.info.restore()
+})
+
+tap.test('input.config --> no file', async assert => {
+  assert.plan(2)
+
+  sinon.stub(core, 'info') // silence output on terminal
+
+  const expected = [{ match: { dependency_type: 'all', update_type: 'semver:patch' } }]
+
+  const result = config({ inputs: { target: 'patch' } })
+
+  assert.match(core.info.getCall(-1)?.firstArg, 'using workflow\'s "target":')
+  assert.match(result, expected)
+
+  core.info.restore()
+})