feat(system.fileName): file extension count (#1101)

Co-authored-by: Piotr Kuczynski <piotr.kuczynski@gmail.com>

Author: xDivisionByZerox

src/modules/system/index.ts

@@ -31,13 +31,37 @@ export class System {
   /**
    * Returns a random file name with extension.
    *
+   * @param options An options object.
+   * @param options.extensionCount Define how many extensions the file name should have. A negative number will be treated as `0`. Defaults to `1`.
+   *
    * @example
    * faker.system.fileName() // 'self_enabling_accountability_toys.kpt'
+   * faker.system.fileName({ extensionCount: 2 }) // 'bike_table.res.vcs'
    */
-  fileName(): string {
-    const str = this.faker.random.words().toLowerCase().replace(/\W/g, '_');
+  fileName(
+    options: {
+      /**
+       * Define how many extensions the file name should have. A negative number will be treated as `0`. Defaults to `1`.
+       */
+      extensionCount?: number;
+    } = {}
+  ): string {
+    const { extensionCount = 1 } = options;
+
+    const baseName = this.faker.random
+      .words()
+      .toLowerCase()
+      .replace(/\W/g, '_');
+
+    if (extensionCount <= 0) {
+      return baseName;
+    }
+
+    const extensionsStr = Array.from({ length: extensionCount })
+      .map(() => this.fileExt())
+      .join('.');
 
-    return `${str}.${this.fileExt()}`;
+    return `${baseName}.${extensionsStr}`;
   }
 
   /**
@@ -49,7 +73,7 @@ export class System {
    * faker.system.commonFileName('txt') // 'global_borders_wyoming.txt'
    */
   commonFileName(ext?: string): string {
-    const str = this.faker.random.words().toLowerCase().replace(/\W/g, '_');
+    const str = this.fileName({ extensionCount: 0 });
 
     return `${str}.${ext || this.commonFileExt()}`;
   }

test/system.spec.ts

@@ -2,6 +2,7 @@ import validator from 'validator';
 import { afterEach, describe, expect, it } from 'vitest';
 import { faker } from '../src';
 import { seededRuns } from './support/seededRuns';
+import { times } from './support/times';
 
 const NON_SEEDED_BASED_RUN = 5;
 
@@ -48,15 +49,23 @@ describe('system', () => {
             'gif',
             'htm',
             'html',
+            'jpe',
             'jpeg',
+            'jpg',
+            'm1v',
             'm2a',
             'm2v',
+            'm3a',
             'mp2',
+            'mp2a',
             'mp3',
             'mp4',
             'mp4v',
+            'mpe',
             'mpeg',
             'mpg',
+            'mpg4',
+            'mpga',
             'pdf',
             'png',
             'shtml',
@@ -180,6 +189,41 @@ describe('system', () => {
             'generated fileNames should have an extension'
           ).toContain('.');
         });
+
+        it('should return filenames with 1 ext per default', () => {
+          const fileName = faker.system.fileName();
+          const parts = fileName.split('.');
+
+          expect(parts).length(2);
+        });
+
+        it('should return filenames without an extension when extensionCount is 0', () => {
+          const fileName = faker.system.fileName({
+            extensionCount: 0,
+          });
+
+          expect(fileName).not.toContain('.');
+        });
+
+        it('should return filenames without an extension when extensionCount is negative', () => {
+          const fileName = faker.system.fileName({
+            extensionCount: -1,
+          });
+
+          expect(fileName).not.toContain('.');
+        });
+
+        it.each(times(10))(
+          'should return filenames with %s extensions',
+          (extensionCount) => {
+            const fileName = faker.system.fileName({
+              extensionCount,
+            });
+            const parts = fileName.split('.');
+
+            expect(parts).length(extensionCount + 1);
+          }
+        );
       });
 
       describe('filePath()', () => {