feat: generate dummy loader when no stories found

Closes: #57

src/storyWriterProcess.js

@@ -23,18 +23,12 @@ const writeOutStoryLoader = pathConfig => {
       );
     });
 
-    if (storyFiles.length > 0) {
-      const sortedFiles = sortFiles(storyFiles);
-      writeFile(sortedFiles, outputFileConfig.outputFile);
-      logger.info(
-        `Compiled story loader for ${storyFiles.length} files:\n`,
-        ` ${storyFiles.join('\n  ')}`
-      );
-    } else {
-      logger.warn(
-        'No files were found matching the specified pattern. Story loader was not written.'
-      );
-    }
+    const sortedFiles = sortFiles(storyFiles);
+    writeFile(sortedFiles, outputFileConfig.outputFile);
+    logger.info(
+      `Compiled story loader for ${storyFiles.length} files:\n`,
+      ` ${storyFiles.join('\n  ')}`
+    );
   });
 };
 

src/storyWriterProcess.test.js

@@ -24,12 +24,12 @@ test('writeOutStoryLoader should perform expected work', () => {
   };
   const firstFiles = generateArray(faker.system.fileName);
   const secondFiles = generateArray(faker.system.fileName);
-  const thirdFiles = generateArray(faker.system.fileName);
+  const noFiles = [];
 
   storyFinder.loadStories
     .mockImplementationOnce(() => firstFiles)
     .mockImplementationOnce(() => secondFiles)
-    .mockImplementationOnce(() => thirdFiles);
+    .mockImplementationOnce(() => noFiles);
 
   writeOutStoryLoader(config);
 
@@ -48,7 +48,7 @@ test('writeOutStoryLoader should perform expected work', () => {
     config.outputFiles[0].outputFile
   );
   expect(writer.writeFile).toHaveBeenCalledWith(
-    thirdFiles.concat().sort(),
+    noFiles.concat().sort(),
     config.outputFiles[1].outputFile
   );
 });

src/writer/__snapshots__/index.test.js.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`writeFile should perform expected work 1`] = `
+exports[`writeFile generate story loader 1`] = `
 "
 // Auto-generated file created by react-native-storybook-loader
 // Do not edit.
@@ -31,3 +31,25 @@ module.exports = {
 };
 "
 `;
+
+exports[`writeFile should generate dummy story loader if no stories were found 1`] = `
+"
+// Auto-generated file created by react-native-storybook-loader
+// Do not edit.
+//
+// https://github.com/elderfo/react-native-storybook-loader.git
+
+function loadStories() {
+  
+}
+
+const stories = [
+  
+];
+
+module.exports = {
+  loadStories,
+  stories,
+};
+"
+`;

src/writer/index.test.js

@@ -20,7 +20,7 @@ afterEach(() => {
   mock.restore();
 });
 
-test('writeFile should perform expected work', () => {
+test('writeFile generate story loader', () => {
   const files = [
     path.resolve(__dirname, '../file1.js'),
     path.resolve(__dirname, '../sub/file2.js'),
@@ -34,3 +34,12 @@ test('writeFile should perform expected work', () => {
 
   expect(contents).toMatchSnapshot();
 });
+
+test('writeFile should generate dummy story loader if no stories were found', () => {
+  const files = [];
+  writeFile(files, outputPath, moduleDir);
+
+  const contents = fs.readFileSync(outputPath, encoding);
+
+  expect(contents).toMatchSnapshot();
+});