Allow specifying a custom fixture directory

Author: Robert Jackson

commands/local/generate/codemod.js

@@ -65,6 +65,7 @@ function jsHandler(options) {
       runTransformTest({ 
         name: '${codemodName}',
         path: require.resolve('./index.js'),
+        fixtureDir: \`\${__dirname}/__testfixtures__/\`,
       });
     `,
     'utf8'

src/test-support.js

@@ -18,9 +18,7 @@ function testRunner(options, runTest) {
         cwd: details.fixtureDir,
         absolute: true,
       })
-      .map((entry) =>
-        entry.slice(entry.indexOf('__testfixtures__') + '__testfixtures__'.length + 1)
-      )
+      .map((entry) => entry.slice(details.fixtureDir.length))
       .forEach((filename) => {
         let extension = path.extname(filename);
         let testName = filename.replace(`.input${extension}`, '');

src/test-support/utils.js

@@ -7,13 +7,14 @@ function transformDetails(options) {
   let transformPath = options.path ? options.path : getTransformPath(process.cwd(), options.name);
   let root = path.dirname(transformPath);
   let transformType = getTransformType(transformPath);
+  let fixtureDir = options.fixtureDir ? options.fixtureDir : path.join(root, '__testfixtures__/');
 
   return {
     name: options.name,
     root,
     transformPath,
     transformType,
-    fixtureDir: path.join(root, '__testfixtures__/'),
+    fixtureDir,
   };
 }