fix: duplicated files when "skipFilesWithNoCoverage=false" on windows

Co-authored-by: Cristian Danilo Gutiérrez <cristian.gutierrez@globant.com>

src/util.js

@@ -17,7 +17,7 @@ function fixPathSeparators(filePath) {
   const isWin = process.platform.startsWith('win');
   // Workaround for https://github.com/mattlewis92/karma-coverage-istanbul-reporter/issues/9
   if (isWin && filePath) {
-    return filePath.replace(/\//g, '\\');
+    return filePath.replace(/\//g, '\\').replace(/\\\\/g, '\\');
   }
 
   return filePath;

test/util.spec.js

@@ -1,5 +1,6 @@
 const { expect } = require('chai');
 const { fixWebpackSourcePaths } = require('../src/util');
+const { fixPathSeparators } = require('../src/util');
 
 const originalPlatform = process.platform;
 
@@ -244,4 +245,34 @@ describe('util', () => {
       ).to.deep.equal(output);
     });
   });
+
+  describe('fixPathSeparators', () => {
+    let input;
+
+    beforeEach(() => {
+      input =
+        '\\Users\\mattlewis\\Code\\/open-source/karma-coverage-istanbul-reporter\\test\\fixtures\\typescript';
+    });
+
+    it('Should transform any forwardslash into backslash and remove any leftover backslash if OS is Windows', () => {
+      Object.defineProperty(process, 'platform', {
+        value: 'win32',
+      });
+
+      const output =
+        '\\Users\\mattlewis\\Code\\open-source\\karma-coverage-istanbul-reporter\\test\\fixtures\\typescript';
+
+      expect(fixPathSeparators(input)).to.deep.equal(output);
+    });
+
+    it('Should not transform any forwardslash into backslash if OS is different from Windows', () => {
+      Object.defineProperty(process, 'platform', {
+        value: 'linux',
+      });
+
+      const output = input;
+
+      expect(fixPathSeparators(input)).to.deep.equal(output);
+    });
+  });
 });