test(license): achieve 100% coverage

#10,#14

__tests__/license.spec.js

@@ -0,0 +1,81 @@
+'use strict'
+const path = require('path')
+const assert = require('yeoman-assert')
+const helpers = require('yeoman-test')
+
+describe('license:generators/license', () => {
+  it('does not create new package.json', () => {
+    return helpers
+      .run(require.resolve('../generators/license'))
+      .withPrompts({
+        name: 'Rick',
+        email: '[email protected]',
+        website: 'http://example.com',
+        license: 'MIT'
+      })
+      .then(() => {
+        assert.file('LICENSE')
+        assert.noFile('package.json')
+      })
+  })
+
+  it('edit pre-existing package.json', () => {
+    return helpers
+      .run(require.resolve('../generators/license'))
+      .inTmpDir(function (dir) {
+        const done = this.async()
+        const fs = require('fs')
+        // eslint-disable-next-line security/detect-non-literal-fs-filename
+        fs.writeFile(path.join(dir, 'package.json'), '{}', done)
+      })
+      .withPrompts({
+        name: 'Rick',
+        email: '[email protected]',
+        website: 'http://example.com',
+        license: 'MIT'
+      })
+      .then(() => {
+        assert.file('LICENSE')
+        assert.fileContent('package.json', '"license": "MIT"')
+      })
+  })
+
+  it('with author options: --name --email --website', () => {
+    return helpers
+      .run(require.resolve('../generators/license'))
+      .withPrompts({
+        license: 'ISC'
+      })
+      .withOptions({
+        name: 'Rick',
+        email: '[email protected]',
+        website: 'http://example.com'
+      })
+      .then(() => {
+        assert.fileContent('LICENSE', 'ISC')
+        assert.fileContent('LICENSE', 'Rick <[email protected]> (http://example.com)')
+        assert.noFile('package.json')
+      })
+  })
+
+  it('makes npm module private when license selected is nolicense', () => {
+    return helpers
+      .run(require.resolve('../generators/license'))
+      .inTmpDir(function (dir) {
+        const fs = require('fs')
+        // eslint-disable-next-line security/detect-non-literal-fs-filename
+        fs.writeFileSync(path.join(dir, 'package.json'), '{}')
+      })
+      .withPrompts({
+        name: 'Rick',
+        email: '[email protected]',
+        website: 'http://example.com',
+        licensePrompt: 'Choose a license',
+        license: 'nolicense'
+      })
+      .then(() => {
+        assert.noFileContent('package.json', '"license"')
+        assert.fileContent('package.json', '"private": true')
+      })
+  })
+})