add tests for getTypesriptConfig

package.json

@@ -29,6 +29,7 @@
     "@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"
   },

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.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()
+        )
+    })
+})

yarn.lock

@@ -1549,6 +1549,10 @@ mkdirp@^0.5.1:
   dependencies:
     minimist "0.0.8"
 
+mock-fs@^4.3.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/mock-fs/-/mock-fs-4.3.0.tgz#c2fab8d784283287e9b6ae7538f2dc56c1a05ed7"
+
 ms@2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.0.0.tgz#5608aeadfc00be6c2901df5f9861788de0d597c8"