✅ Add tests for config

jest.config.js

@@ -2,5 +2,6 @@
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
-  testMatch: ['src/**/*.test.ts'],
+  testMatch: ['**/*.test.ts'],
+  rootDir: 'src',
 }

src/index.ts

@@ -1,7 +1,7 @@
 // Init the logger before literally anything else to stop really obscure error
 // messages from occurring
-import Log from './log'
-export const log = new Log()
+import { log as logInited } from './log'
+export const log = logInited
 
 import chalk from 'chalk'
 import commander, { Command } from 'commander'

src/log.ts

@@ -69,4 +69,6 @@ class Log {
   }
 }
 
+export const log = new Log()
+
 export default Log

src/utils/config.test.ts

@@ -0,0 +1,83 @@
+import { existsSync, readFileSync, unlinkSync, writeFileSync } from 'fs'
+import {
+  configPath,
+  defaultConfig,
+  getConfig,
+  hasConfig,
+  rawConfig,
+} from './config'
+
+function preserveExistingConfig() {
+  let configExists = false
+  let configContents = ''
+
+  beforeAll(() => {
+    if (existsSync(configPath)) {
+      configContents = readFileSync(configPath, 'utf8')
+      configExists = true
+      unlinkSync(configPath)
+    }
+  })
+
+  afterAll(() => {
+    if (configExists) {
+      writeFileSync(configPath, configContents)
+    }
+  })
+}
+
+describe('hasConfig', () => {
+  preserveExistingConfig()
+
+  it('returns false when the config file does not exist', () =>
+    expect(hasConfig()).toBe(false))
+
+  it('returns true when the config file exists', () => {
+    writeFileSync(configPath, '{}')
+    expect(hasConfig()).toBe(true)
+    unlinkSync(configPath)
+  })
+})
+
+describe('rawConfig', () => {
+  preserveExistingConfig()
+
+  it('Returns "{}" when no config exists', () => expect(rawConfig()).toBe('{}'))
+
+  it('Returns the contents of the config file', () => {
+    writeFileSync(configPath, '{"test": "val"}')
+    expect(rawConfig()).toBe('{"test": "val"}')
+    unlinkSync(configPath)
+  })
+})
+
+describe('getConfig', () => {
+  preserveExistingConfig()
+
+  it('Returns the default config when none exists', () =>
+    expect(getConfig()).toEqual(defaultConfig))
+
+  it('Returns the default config when the config is empty', () => {
+    writeFileSync(configPath, '{}')
+    expect(getConfig()).toEqual(defaultConfig)
+    unlinkSync(configPath)
+  })
+
+  it('Returns a merged config when there is a specified value', () => {
+    writeFileSync(configPath, '{"name": "val"}')
+    expect(getConfig()).toEqual({ ...defaultConfig, name: 'val' })
+    unlinkSync(configPath)
+  })
+
+  it('Throws an error if there is invalid JSON', () => {
+    writeFileSync(configPath, '{invalid json')
+    expect(() => getConfig()).toThrowError()
+    unlinkSync(configPath)
+  })
+
+  it('Throws an error if the product is invalid', () => {
+    writeFileSync(configPath, '{"version": {"product": "invalid"}}')
+    expect(() => getConfig()).toThrowError()
+    unlinkSync(configPath)
+  })
+})

src/utils/config.ts

@@ -5,7 +5,7 @@
 import { existsSync, readFileSync } from 'fs'
 import { join } from 'path'
 
-import { log } from '..'
+import { log } from '../log'
 
 export const projectDir = process.cwd()
 export const configPath = join(projectDir, 'melon.json')
@@ -79,7 +79,7 @@ export interface Config {
   >
 }
 
-const defaultConfig: Config = {
+export const defaultConfig: Config = {
   name: 'Unknown melon build',
   vendor: 'Unknown',
   appId: 'unknown.appid',
@@ -107,23 +107,29 @@ export function hasConfig(): boolean {
   return existsSync(configPath)
 }
 
-export function getConfig(): Config {
+export function rawConfig(): string {
   const configExists = hasConfig()
 
-  let fileContents = '{}'
-  let fileParsed: Config
+  let contents = '{}'
 
-  if (!configExists) {
+  if (configExists) {
+    contents = readFileSync(configPath, 'utf8')
+  } else {
     if (!hasWarnedAboutConfig) {
       log.warning(
         `Config file not found at ${configPath}. It is recommended to create one by running |melon setup-project|`
       )
       hasWarnedAboutConfig = true
     }
-  } else {
-    fileContents = readFileSync(configPath).toString()
   }
 
+  return contents
+}
+
+export function getConfig(): Config {
+  const fileContents = rawConfig()
+  let fileParsed: Config
+
   try {
     // Try to parse the contents of the file. May not be valid JSON
     fileParsed = JSON.parse(fileContents)