test(plugin-webpack): add tests for resolveForgeConfig

packages/plugin/webpack/test/WebpackPlugin_spec.ts

@@ -1,12 +1,14 @@
 import { expect } from 'chai';
+import { ForgeConfig } from '@electron-forge/shared-types';
 import * as fs from 'fs-extra';
 import * as path from 'path';
 import { tmpdir } from 'os';
 
+import { WebpackPluginConfig } from '../src/Config';
 import WebpackPlugin from '../src/WebpackPlugin';
 
 describe('WebpackPlugin', () => {
-  const baseConfig = {
+  const baseConfig: WebpackPluginConfig = {
     mainConfig: {},
     renderer: {
       config: {},
@@ -58,4 +60,51 @@ describe('WebpackPlugin', () => {
       await fs.remove(webpackTestDir);
     });
   });
+
+  describe('resolveForgeConfig', () => {
+    let plugin: WebpackPlugin;
+
+    before(() => {
+      plugin = new WebpackPlugin(baseConfig);
+    });
+
+    it('sets packagerConfig and packagerConfig.ignore if it does not exist', async () => {
+      const config = await plugin.resolveForgeConfig({} as ForgeConfig);
+      expect(config.packagerConfig).to.not.equal(undefined);
+      expect(config.packagerConfig.ignore).to.be.a('function');
+    });
+
+    describe('packagerConfig.ignore', () => {
+      it('does not overwrite an existing ignore value', async () => {
+        const config = await plugin.resolveForgeConfig({
+          packagerConfig: {
+            ignore: /test/,
+          },
+        } as ForgeConfig);
+
+        expect(config.packagerConfig.ignore).to.deep.equal(/test/);
+      });
+
+      it('ignores everything but files in .webpack', async () => {
+        const config = await plugin.resolveForgeConfig({} as ForgeConfig);
+        const ignore = config.packagerConfig.ignore as Function;
+
+        expect(ignore('')).to.equal(false);
+        expect(ignore('/abc')).to.equal(true);
+        expect(ignore('/.webpack')).to.equal(false);
+        expect(ignore('/.webpack/foo')).to.equal(false);
+      });
+
+      it('ignores files generated by jsonStats config', async () => {
+        const webpackConfig = { ...baseConfig, jsonStats: true };
+        webpackConfig.renderer.jsonStats = true;
+        plugin = new WebpackPlugin(webpackConfig);
+        const config = await plugin.resolveForgeConfig({} as ForgeConfig);
+        const ignore = config.packagerConfig.ignore as Function;
+
+        expect(ignore(path.join('foo', 'bar', '.webpack', 'main', 'stats.json'))).to.equal(true);
+        expect(ignore(path.join('foo', 'bar', '.webpack', 'renderer', 'stats.json'))).to.equal(true);
+      });
+    });
+  });
 });