Add tests for findTagName() and findElementId()

Author: Turbo87

.eslintrc.js

@@ -14,4 +14,10 @@ module.exports = {
     'no-console': 'off',
     'prettier/prettier': 'error',
   },
+  overrides: [{
+    files: '**/__tests__/**/*.js',
+    env: {
+      jest: true,
+    },
+  }]
 };

lib/__tests__/find-properties.js

@@ -0,0 +1,53 @@
+const j = require('jscodeshift').withParser('ts');
+
+const { findTagName, findElementId } = require('../transform');
+
+describe('findTagName()', () => {
+  const TESTS = [
+    ['', 'div'],
+    ["tagName: ''", ''],
+    ["tagName: 'div'", 'div'],
+    ["tagName: 'span'", 'span'],
+    ["tagName: 'svg'", 'svg'],
+    ['tagName: 5', /Unexpected `tagName` value: 5/],
+    ['tagName: foo', /Unexpected `tagName` value: foo/],
+  ];
+
+  for (let [input, expected] of TESTS) {
+    test(input || 'empty', () => {
+      let props = j(`export default {${input}};`)
+        .find(j.ExportDefaultDeclaration)
+        .get('declaration', 'properties');
+
+      if (expected instanceof RegExp) {
+        expect(() => findTagName(props)).toThrow(expected);
+      } else {
+        expect(findTagName(props)).toEqual(expected);
+      }
+    });
+  }
+});
+
+describe('findElementId()', () => {
+  const TESTS = [
+    ['', null],
+    ["elementId: ''", ''],
+    ["elementId: 'foo'", 'foo'],
+    ['elementId: 5', /Unexpected `elementId` value: 5/],
+    ['elementId: foo', /Unexpected `elementId` value: foo/],
+  ];
+
+  for (let [input, expected] of TESTS) {
+    test(input || 'empty', () => {
+      let props = j(`export default {${input}};`)
+        .find(j.ExportDefaultDeclaration)
+        .get('declaration', 'properties');
+
+      if (expected instanceof RegExp) {
+        expect(() => findElementId(props)).toThrow(expected);
+      } else {
+        expect(findElementId(props)).toEqual(expected);
+      }
+    });
+  }
+});

lib/transform.js

@@ -255,4 +255,4 @@ function findClassNameBindings(properties) {
   return classNameBindings;
 }
 
-module.exports = { transform };
+module.exports = { transform, findTagName, findElementId };

package.json

@@ -11,7 +11,8 @@
   },
   "scripts": {
     "changelog": "lerna-changelog",
-    "lint": "eslint . --cache"
+    "lint": "eslint . --cache",
+    "test": "jest"
   },
   "dependencies": {
     "chalk": "^2.4.2",
@@ -26,6 +27,7 @@
     "eslint-config-prettier": "^6.1.0",
     "eslint-plugin-node": "^9.1.0",
     "eslint-plugin-prettier": "^3.1.0",
+    "jest": "^24.9.0",
     "lerna-changelog": "^0.8.2",
     "prettier": "1.18.2"
   },