fix: allow user to define testMatch in package.json (#1067)

Author: dhensche

packages/@vue/cli-plugin-unit-jest/__tests__/jestPlugin.spec.js

@@ -11,3 +11,25 @@ test('should work', async () => {
   })
   await project.run(`vue-cli-service test`)
 })
+
+test('should respect jest testMatch config', async () => {
+  const project = await create('unit-jest', {
+    plugins: {
+      '@vue/cli-plugin-babel': {},
+      '@vue/cli-plugin-unit-jest': {}
+    }
+  })
+  const config = JSON.parse(await project.read('package.json'))
+  config.jest.testMatch = ['custom-test-directory/my.spec.js']
+
+  await project.write('package.json', JSON.stringify(config))
+
+  let result
+  try {
+    await project.run(`vue-cli-service test`)
+  } catch (e) {
+    result = e
+  }
+  console.log(result)
+  expect(result.stdout).toMatch('custom-test-directory/my.spec.js')
+})

packages/@vue/cli-plugin-unit-jest/index.js

@@ -18,7 +18,7 @@ module.exports = api => {
     const jestBinPath = require.resolve('jest/bin/jest')
 
     let testMatch = []
-    if (!args._.length) {
+    if (!args._.length && !api.service.pkg.jest.testMatch) {
       testMatch = [`--testMatch`, `<rootDir>/(tests/unit/**/*.spec.(ts|tsx|js)|**/__tests__/*.(ts|tsx|js))`]
     }