feat: add 'fixtureOutputExt' configuration option (#73)

* added 'fixtureOutputExt' configuration option

* Doc for fixtureOutputExt

Co-authored-by: Marek <marek.b@cstechnologies.cz>

README.md

@@ -218,6 +218,12 @@ Use this to provide your own implementation of babel. This is particularly
 useful if you want to use a different version of babel than what's included in
 this package.
 
+#### fixtureOutputExt
+
+Use this to provide your own fixture output file extension. This is particularly
+useful if you are testing typescript input. If ommited fixture input file extension
+will be used.
+
 #### ...rest
 
 The rest of the options you provide will be [`lodash.merge`][lodash.merge]d with

src/__tests__/fixtures/fixtures/fixtureOutputExt/code.ts

@@ -0,0 +1 @@
+'use strict';

src/__tests__/fixtures/fixtures/fixtureOutputExt/options.json

@@ -0,0 +1 @@
+{"fixtureOutputExt": ".js"}

src/__tests__/fixtures/fixtures/fixtureOutputExt/output.js

@@ -0,0 +1 @@
+'use strict';

src/__tests__/plugin-tester.js

@@ -305,13 +305,14 @@ test('can pass tests in fixtures relative to the filename', async () => {
     }),
   )
   expect(describeSpy).toHaveBeenCalledTimes(6)
-  expect(itSpy).toHaveBeenCalledTimes(13)
+  expect(itSpy).toHaveBeenCalledTimes(14)
 
   expect(itSpy.mock.calls).toEqual([
     [`cjs`, expect.any(Function)],
     [`js`, expect.any(Function)],
     [`normal`, expect.any(Function)],
     [`changed`, expect.any(Function)],
+    [`fixtureOutputExt`, expect.any(Function)],
     [`jsx support`, expect.any(Function)],
     [`nested a`, expect.any(Function)],
     [`nested b`, expect.any(Function)],
@@ -620,7 +621,7 @@ test('allows formatting fixtures results', async () => {
       formatResult: formatResultSpy,
     }),
   )
-  expect(formatResultSpy).toHaveBeenCalledTimes(14)
+  expect(formatResultSpy).toHaveBeenCalledTimes(15)
 })
 
 test('works with a formatter adding a empty line', async () => {
@@ -632,7 +633,7 @@ test('works with a formatter adding a empty line', async () => {
       formatResult: formatResultSpy,
     }),
   )
-  expect(formatResultSpy).toHaveBeenCalledTimes(14)
+  expect(formatResultSpy).toHaveBeenCalledTimes(15)
 })
 
 test('prettier formatter supported', async () => {
@@ -682,7 +683,7 @@ test('gets options from options.json files when using fixtures', async () => {
     }),
   )
 
-  expect(optionRootFoo).toHaveBeenCalledTimes(13)
+  expect(optionRootFoo).toHaveBeenCalledTimes(14)
   expect(optionFoo).toHaveBeenCalledTimes(2)
   expect(optionBar).toHaveBeenCalledTimes(1)
 })
@@ -727,10 +728,10 @@ test('appends to root plugins array', async () => {
     }),
   )
 
-  expect(optionRootFoo).toHaveBeenCalledTimes(13)
+  expect(optionRootFoo).toHaveBeenCalledTimes(14)
   expect(optionFoo).toHaveBeenCalledTimes(2)
   expect(optionBar).toHaveBeenCalledTimes(1)
-  expect(programVisitor).toHaveBeenCalledTimes(14)
+  expect(programVisitor).toHaveBeenCalledTimes(15)
 })
 
 test('endOfLine - default', async () => {

src/plugin-tester.js

@@ -293,7 +293,6 @@ const createFixtureTests = (fixturesDir, options) => {
       return
     }
 
-    const ext = `.${codePath.split('.').pop()}`
     it(blockTitle, () => {
       const {
         plugin,
@@ -345,6 +344,14 @@ const createFixtureTests = (fixturesDir, options) => {
         ),
       )
 
+      const {fixtureOutputExt} = fixturePluginOptions
+      let ext
+      if (fixtureOutputExt) {
+        ext = fixtureOutputExt
+      } else {
+        ext = `.${codePath.split('.').pop()}`
+      }
+
       const outputPath = path.join(fixtureDir, `${fixtureOutputName}${ext}`)
 
       if (!fs.existsSync(outputPath)) {