feat: added unit tests

added unit tests for option "prefixPublicPathWithWebpackPublicPath"

test/__snapshots__/publicPath-option.test.js.snap

@@ -1,5 +1,59 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`when applied with \`publicPath\` and \`prefixPublicPathWithWebpackPublicPath\` options matches snapshot for \`{Function}\` value 1`] = `
+Object {
+  "assets": Array [
+    "9c87cbf3ba33126ffd25ae7f2f6bbafb.png",
+  ],
+  "source": "module.exports = __webpack_public_path__ + \\"public_path/9c87cbf3ba33126ffd25ae7f2f6bbafb.png\\";",
+}
+`;
+
+exports[`when applied with \`publicPath\` and \`prefixPublicPathWithWebpackPublicPath\` options matches snapshot for \`{Function}\` value and pass \`context\` 1`] = `
+Object {
+  "assets": Array [
+    "9c87cbf3ba33126ffd25ae7f2f6bbafb.png",
+  ],
+  "source": "module.exports = __webpack_public_path__ + \\"public_path/9c87cbf3ba33126ffd25ae7f2f6bbafb.png\\";",
+}
+`;
+
+exports[`when applied with \`publicPath\` and \`prefixPublicPathWithWebpackPublicPath\` options matches snapshot for \`{Function}\` value and pass \`resourcePath\` 1`] = `
+Object {
+  "assets": Array [
+    "9c87cbf3ba33126ffd25ae7f2f6bbafb.png",
+  ],
+  "source": "module.exports = __webpack_public_path__ + \\"public_path/9c87cbf3ba33126ffd25ae7f2f6bbafb.png\\";",
+}
+`;
+
+exports[`when applied with \`publicPath\` and \`prefixPublicPathWithWebpackPublicPath\` options matches snapshot for \`{String}\` value 1`] = `
+Object {
+  "assets": Array [
+    "9c87cbf3ba33126ffd25ae7f2f6bbafb.png",
+  ],
+  "source": "module.exports = __webpack_public_path__ + \\"public_path/9c87cbf3ba33126ffd25ae7f2f6bbafb.png\\";",
+}
+`;
+
+exports[`when applied with \`publicPath\` and \`prefixPublicPathWithWebpackPublicPath\` options matches snapshot for \`{String}\` value as URL 1`] = `
+Object {
+  "assets": Array [
+    "9c87cbf3ba33126ffd25ae7f2f6bbafb.png",
+  ],
+  "source": "module.exports = __webpack_public_path__ + \\"https://cdn.com/9c87cbf3ba33126ffd25ae7f2f6bbafb.png\\";",
+}
+`;
+
+exports[`when applied with \`publicPath\` and \`prefixPublicPathWithWebpackPublicPath\` options matches snapshot for \`{String}\` value without trailing slash 1`] = `
+Object {
+  "assets": Array [
+    "9c87cbf3ba33126ffd25ae7f2f6bbafb.png",
+  ],
+  "source": "module.exports = __webpack_public_path__ + \\"public_path/9c87cbf3ba33126ffd25ae7f2f6bbafb.png\\";",
+}
+`;
+
 exports[`when applied with \`publicPath\` option matches snapshot for \`{Function}\` value 1`] = `
 Object {
   "assets": Array [

test/publicPath-option.test.js

@@ -127,3 +127,124 @@ describe('when applied with `publicPath` option', () => {
     expect({ assets, source }).toMatchSnapshot();
   });
 });
+
+describe('when applied with `publicPath` and `prefixPublicPathWithWebpackPublicPath` options', () => {
+  it('matches snapshot for `{String}` value', async () => {
+    const config = {
+      loader: {
+        test: /(png|jpg|svg)/,
+        options: {
+          publicPath: 'public_path/',
+          prefixPublicPathWithWebpackPublicPath: true,
+        },
+      },
+    };
+
+    const stats = await webpack('fixture.js', config);
+    const [module] = stats.toJson().modules;
+    const { assets, source } = module;
+
+    expect({ assets, source }).toMatchSnapshot();
+  });
+
+  it('matches snapshot for `{String}` value without trailing slash', async () => {
+    const config = {
+      loader: {
+        test: /(png|jpg|svg)/,
+        options: {
+          publicPath: 'public_path',
+          prefixPublicPathWithWebpackPublicPath: true,
+        },
+      },
+    };
+
+    const stats = await webpack('fixture.js', config);
+    const [module] = stats.toJson().modules;
+    const { assets, source } = module;
+
+    expect({ assets, source }).toMatchSnapshot();
+  });
+
+  // notice that this case will produce invalid urls if __webpack_public_path__ is set to an absolute url
+  it('matches snapshot for `{String}` value as URL', async () => {
+    const config = {
+      loader: {
+        test: /(png|jpg|svg)/,
+        options: {
+          publicPath: 'https://cdn.com/',
+          prefixPublicPathWithWebpackPublicPath: true,
+        },
+      },
+    };
+
+    const stats = await webpack('fixture.js', config);
+    const [module] = stats.toJson().modules;
+    const { assets, source } = module;
+
+    expect({ assets, source }).toMatchSnapshot();
+  });
+
+  it('matches snapshot for `{Function}` value', async () => {
+    const config = {
+      loader: {
+        test: /(png|jpg|svg)/,
+        options: {
+          publicPath(url) {
+            return `public_path/${url}`;
+          },
+          prefixPublicPathWithWebpackPublicPath: true,
+        },
+      },
+    };
+
+    const stats = await webpack('fixture.js', config);
+    const [module] = stats.toJson().modules;
+    const { assets, source } = module;
+
+    expect({ assets, source }).toMatchSnapshot();
+  });
+
+  it('matches snapshot for `{Function}` value and pass `resourcePath`', async () => {
+    const config = {
+      loader: {
+        test: /(png|jpg|svg)/,
+        options: {
+          publicPath(url, resourcePath) {
+            expect(resourcePath).toMatch('file.png');
+
+            return `public_path/${url}`;
+          },
+          prefixPublicPathWithWebpackPublicPath: true,
+        },
+      },
+    };
+
+    const stats = await webpack('fixture.js', config);
+    const [module] = stats.toJson().modules;
+    const { assets, source } = module;
+
+    expect({ assets, source }).toMatchSnapshot();
+  });
+
+  it('matches snapshot for `{Function}` value and pass `context`', async () => {
+    const config = {
+      loader: {
+        test: /(png|jpg|svg)/,
+        options: {
+          publicPath(url, resourcePath, context) {
+            expect(context).toMatch('fixtures');
+
+            return `public_path/${url}`;
+          },
+          prefixPublicPathWithWebpackPublicPath: true,
+        },
+      },
+    };
+
+    const stats = await webpack('fixture.js', config);
+    const [module] = stats.toJson().modules;
+    const { assets, source } = module;
+
+    expect({ assets, source }).toMatchSnapshot();
+  });
+});