Add tests with Jest

package.json

@@ -9,8 +9,10 @@
   ],
   "scripts": {
     "prepublish": "npm run build",
+    "precommit": "npm run test",
     "build": "rm -rf dist && tsc",
-    "test": "npm run lint",
+    "pretest": "npm run lint",
+    "test": "jest",
     "lint": "tslint -c tslint.json 'src/**/*.ts'"
   },
   "repository": {
@@ -25,13 +27,28 @@
   ],
   "devDependencies": {
     "@types/fs-extra": "2.0.0",
+    "@types/jest": "^19.2.4",
     "@types/lodash": "^4.14.62",
+    "jest": "^20.0.4",
+    "mock-fs": "^4.3.0",
+    "ts-jest": "^20.0.6",
     "tslint": "^5.1.0"
   },
   "dependencies": {
     "fs-p": "2.0.0",
     "globby": "^6.1.0",
     "lodash": "^4.17.4",
     "typescript": "^2.2.2"
+  },
+  "jest": {
+    "transform": {
+      ".(ts|tsx)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
+    },
+    "testRegex": "(/__tests__/.*|\\.(test|spec))\\.(ts|tsx|js)$",
+    "moduleFileExtensions": [
+      "ts",
+      "tsx",
+      "js"
+    ]
   }
 }

src/typescript.ts

@@ -4,6 +4,20 @@ import * as _ from 'lodash'
 import { ServerlessFunction } from './types'
 import * as path from 'path'
 
+export function makeDefaultTypescriptConfig() {
+  const defaultTypescriptConfig: ts.CompilerOptions = {
+    preserveConstEnums: true,
+    strictNullChecks: true,
+    sourceMap: true,
+    target: ts.ScriptTarget.ES5,
+    moduleResolution: ts.ModuleResolutionKind.NodeJs,
+    lib: ['lib.es2015.d.ts'],
+    rootDir: './',
+  }
+
+  return defaultTypescriptConfig
+}
+
 export function extractFileNames(functions: { [key: string]: ServerlessFunction }): string[] {
   return _.values(functions)
     .map(fn => fn.handler)
@@ -59,15 +73,5 @@ export function getTypescriptConfig(cwd: string): ts.CompilerOptions {
     return configParseResult.options
   }
 
-  const defaultTypescriptConfig: ts.CompilerOptions = {
-    preserveConstEnums: true,
-    strictNullChecks: true,
-    sourceMap: true,
-    target: ts.ScriptTarget.ES5,
-    moduleResolution: ts.ModuleResolutionKind.NodeJs,
-    lib: ['lib.es2015.d.ts'],
-    rootDir: './',
-  }
-
-  return defaultTypescriptConfig
+  return makeDefaultTypescriptConfig()
 }

tests/typescript.extractFileName.test.ts

@@ -0,0 +1,41 @@
+import {extractFileNames} from '../src/typescript'
+import {ServerlessFunction} from '../src/types'
+
+const functions: { [key: string]: ServerlessFunction } = {
+    hello: {
+        handler: 'my-folder/hello.handler',
+        package: {
+            include: [],
+            exclude: []
+        }
+    },
+    world: {
+        handler: 'my-folder/my-subfolder/world.handler',
+        package: {
+            include: [],
+            exclude: []
+        }
+    },
+    create: {
+        handler: 'create.create',
+        package: {
+            include: [],
+            exclude: []
+        }
+    },
+}
+
+describe('extractFileName', () => {
+    it('get function filenames from serverless service', () => {
+        expect(
+            extractFileNames(functions),
+        ).toEqual(
+            [
+                'my-folder/hello.ts',
+                'my-folder/my-subfolder/world.ts',
+                'create.ts',
+            ],
+        )
+    })
+})
+

tests/typescript.getTypescriptConfig.test.ts

@@ -0,0 +1,11 @@
+import {getTypescriptConfig, makeDefaultTypescriptConfig} from '../src/typescript'
+
+describe('getTypescriptConfig', () => {
+    it(`returns default typescript configuration if the one provided doesn't exist`, () => {
+        expect(
+            getTypescriptConfig('/ciaone/my-folder'),
+        ).toEqual(
+            makeDefaultTypescriptConfig()
+        )
+    })
+})