test: giving steroids to the test suite 💪 (#122)

* purely test suite on steroids * verify stuff * more fun verifies * ok ok ok I'm done * extend timeout and consolidate to constant for easier usage across tests * PR feedback :) Remove warnings by adding transform regex to `ts-jest` and `testMatch`. * cleanup * cleanup * PR feedback & converting `export function` to `export const` in `util.ts`
2025-02-18 23:58:52 -08:00
parent d76ca76072
commit 7c0ad6caa5
6 changed files with 745 additions and 129 deletions
--- a/jest.config.js
+++ b/jest.config.js
@@ -3,13 +3,14 @@ module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  transform: {
-    '.': [
+    '^.+\\.ts?$': [
      'ts-jest',
      {
-        tsconfig: 'tsconfig.jest.json'
-      }
-    ]
+        tsconfig: 'tsconfig.jest.json',
+      },
+    ],
  },
+  testMatch: ['<rootDir>/test/**/*.spec.ts'],
  globalSetup: './jest.setup.ts',
  testTimeout: 10000,
 };
--- a/jest.setup.ts
+++ b/jest.setup.ts
@@ -1,28 +1,6 @@
-import { downloadArtifact } from '@electron/get';
-import * as zip from 'cross-zip';
 import * as fs from 'fs-extra';
 import * as path from 'path';
-
-const asarsDir = path.resolve(__dirname, 'test', 'fixtures', 'asars');
-const appsDir = path.resolve(__dirname, 'test', 'fixtures', 'apps');
-
-const templateApp = async (
-  name: string,
-  arch: string,
-  modify: (appPath: string) => Promise<void>,
-) => {
-  const electronZip = await downloadArtifact({
-    artifactName: 'electron',
-    version: '27.0.0',
-    platform: 'darwin',
-    arch,
-  });
-  const appPath = path.resolve(appsDir, name);
-  zip.unzipSync(electronZip, appsDir);
-  await fs.rename(path.resolve(appsDir, 'Electron.app'), appPath);
-  await fs.remove(path.resolve(appPath, 'Contents', 'Resources', 'default_app.asar'));
-  await modify(appPath);
-};
+import { appsDir, asarsDir, templateApp } from './test/util';

 export default async () => {
  await fs.remove(appsDir);
--- a/src/asar-utils.ts
+++ b/src/asar-utils.ts
@@ -84,8 +84,10 @@ export const mergeASARs = async ({
 }: MergeASARsOptions): Promise<void> => {
  d(`merging ${x64AsarPath} and ${arm64AsarPath}`);

-  const x64Files = new Set(asar.listPackage(x64AsarPath).map(toRelativePath));
-  const arm64Files = new Set(asar.listPackage(arm64AsarPath).map(toRelativePath));
+  const x64Files = new Set(asar.listPackage(x64AsarPath, { isPack: false }).map(toRelativePath));
+  const arm64Files = new Set(
+    asar.listPackage(arm64AsarPath, { isPack: false }).map(toRelativePath),
+  );

  //
  // Build set of unpacked directories and files
--- a/test/snapshots/index.spec.ts.snap
+++ b/test/snapshots/index.spec.ts.snap
@@ -0,0 +1,410 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`makeUniversalApp asar mode should correctly merge two identical asars 1`] = `
+{
+  "files": {
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+        ],
+        "hash": "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+      },
+      "size": 64,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+        ],
+        "hash": "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+      },
+      "size": 41,
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should correctly merge two identical asars 2`] = `
+{
+  "Contents/Info.plist": {
+    "Resources/app.asar": {
+      "algorithm": "SHA256",
+      "hash": "85fff474383bd8df11cd9c5784e8fcd1525af71ff140a8a882e1dc9d5b39fcbf",
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should create a shim if asars are different between architectures 1`] = `
+{
+  "files": {
+    "extra-file.txt": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "b8f261b95f81761658c8875b33a68001d8750fd898f447373bf6347e779bc3de",
+        ],
+        "hash": "b8f261b95f81761658c8875b33a68001d8750fd898f447373bf6347e779bc3de",
+      },
+      "size": 15,
+    },
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+        ],
+        "hash": "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+      },
+      "size": 64,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+        ],
+        "hash": "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+      },
+      "size": 41,
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should create a shim if asars are different between architectures 2`] = `
+{
+  "files": {
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+        ],
+        "hash": "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+      },
+      "size": 64,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+        ],
+        "hash": "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+      },
+      "size": 41,
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should create a shim if asars are different between architectures 3`] = `
+{
+  "files": {
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "b7e5f58d3c0fddc1a57d1279a7f19a34a01784f4036920d4b60a1e33f6d1635b",
+        ],
+        "hash": "b7e5f58d3c0fddc1a57d1279a7f19a34a01784f4036920d4b60a1e33f6d1635b",
+      },
+      "size": 1068,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "2873266521e41d58d02e7acfbbbdb046edfa04b6ce262b8987de8e8548671fc7",
+        ],
+        "hash": "2873266521e41d58d02e7acfbbbdb046edfa04b6ce262b8987de8e8548671fc7",
+      },
+      "size": 33,
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should create a shim if asars are different between architectures 4`] = `
+{
+  "Contents/Info.plist": {
+    "Resources/app-arm64.asar": {
+      "algorithm": "SHA256",
+      "hash": "71db54541357128943df64d54480a22d0cdf4c283f2044f48101fb1fc6e6fb2d",
+    },
+    "Resources/app-x64.asar": {
+      "algorithm": "SHA256",
+      "hash": "85fff474383bd8df11cd9c5784e8fcd1525af71ff140a8a882e1dc9d5b39fcbf",
+    },
+    "Resources/app.asar": {
+      "algorithm": "SHA256",
+      "hash": "b62aaaed07ff72dc33da1720d900e0443c060285ef374ce1bdaef1d4f28b5fe4",
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should merge two different asars when \`mergeASARs\` is enabled 1`] = `
+{
+  "files": {
+    "extra-file.txt": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "b8f261b95f81761658c8875b33a68001d8750fd898f447373bf6347e779bc3de",
+        ],
+        "hash": "b8f261b95f81761658c8875b33a68001d8750fd898f447373bf6347e779bc3de",
+      },
+      "size": 15,
+    },
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+        ],
+        "hash": "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+      },
+      "size": 64,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+        ],
+        "hash": "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+      },
+      "size": 41,
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should merge two different asars when \`mergeASARs\` is enabled 2`] = `
+{
+  "Contents/Info.plist": {
+    "Resources/app.asar": {
+      "algorithm": "SHA256",
+      "hash": "71db54541357128943df64d54480a22d0cdf4c283f2044f48101fb1fc6e6fb2d",
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should not inject ElectronAsarIntegrity into \`infoPlistsToIgnore\` 1`] = `
+{
+  "files": {
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "0f6311dac07f0876c436ce2be042eb88c96e17eaf140b39627cf720dd87ad5b8",
+        ],
+        "hash": "0f6311dac07f0876c436ce2be042eb88c96e17eaf140b39627cf720dd87ad5b8",
+      },
+      "size": 66,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+        ],
+        "hash": "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+      },
+      "size": 41,
+    },
+    "private": {
+      "files": {
+        "var": {
+          "files": {
+            "app": {
+              "files": {
+                "file.txt": {
+                  "link": "private/var/file.txt",
+                },
+              },
+            },
+            "file.txt": {
+              "integrity": {
+                "algorithm": "SHA256",
+                "blockSize": 4194304,
+                "blocks": [
+                  "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9",
+                ],
+                "hash": "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9",
+              },
+              "size": 11,
+            },
+          },
+        },
+      },
+    },
+    "var": {
+      "link": "private/var",
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp asar mode should not inject ElectronAsarIntegrity into \`infoPlistsToIgnore\` 2`] = `
+{
+  "Contents/Info.plist": undefined,
+  "Contents/Resources/SubApp-1.app/Contents/Info.plist": undefined,
+}
+`;
+
+exports[`makeUniversalApp force packages successfully if \`out\` bundle already exists and \`force\` is \`true\` 1`] = `
+{
+  "files": {
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+        ],
+        "hash": "8c8cefe616b330a70980c457e479360417a320f53f484d34df65227ce3add026",
+      },
+      "size": 64,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+        ],
+        "hash": "d6226276d47adc7aa20e6c46e842e258f5157313074a035051a89612acdd6be3",
+      },
+      "size": 41,
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp force packages successfully if \`out\` bundle already exists and \`force\` is \`true\` 2`] = `
+{
+  "Contents/Info.plist": {
+    "Resources/app.asar": {
+      "algorithm": "SHA256",
+      "hash": "85fff474383bd8df11cd9c5784e8fcd1525af71ff140a8a882e1dc9d5b39fcbf",
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp no asar mode should correctly merge two identical app folders 1`] = `
+[
+  "index.js",
+  {
+    "content": "{
+  "name": "app",
+  "main": "index.js"
+}",
+    "name": "package.json",
+  },
+]
+`;
+
+exports[`makeUniversalApp no asar mode should correctly merge two identical app folders 2`] = `
+{
+  "Contents/Info.plist": {},
+}
+`;
+
+exports[`makeUniversalApp no asar mode should shim two different app folders 1`] = `
+{
+  "files": {
+    "index.js": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "f1e14240f7c833900fca84fabc2f0ff27084efdf1c5b228b015515de3f8fa28e",
+        ],
+        "hash": "f1e14240f7c833900fca84fabc2f0ff27084efdf1c5b228b015515de3f8fa28e",
+      },
+      "size": 1063,
+    },
+    "package.json": {
+      "integrity": {
+        "algorithm": "SHA256",
+        "blockSize": 4194304,
+        "blocks": [
+          "2873266521e41d58d02e7acfbbbdb046edfa04b6ce262b8987de8e8548671fc7",
+        ],
+        "hash": "2873266521e41d58d02e7acfbbbdb046edfa04b6ce262b8987de8e8548671fc7",
+      },
+      "size": 33,
+    },
+  },
+}
+`;
+
+exports[`makeUniversalApp no asar mode should shim two different app folders 2`] = `
+[
+  "private/var/i-aint-got-no-rhythm.bin",
+]
+`;
+
+exports[`makeUniversalApp no asar mode should shim two different app folders 3`] = `
+[
+  "index.js",
+  {
+    "content": "{
+  "name": "app",
+  "main": "index.js"
+}",
+    "name": "package.json",
+  },
+  {
+    "content": "hello world",
+    "name": "private/var/file.txt",
+  },
+  "private/var/i-aint-got-no-rhythm.bin",
+]
+`;
+
+exports[`makeUniversalApp no asar mode should shim two different app folders 4`] = `
+[
+  "index.js",
+  {
+    "content": "{
+  "name": "app",
+  "main": "index.js"
+}",
+    "name": "package.json",
+  },
+  {
+    "content": "hello world",
+    "name": "private/var/file.txt",
+  },
+  "private/var/hello-world.bin",
+]
+`;
+
+exports[`makeUniversalApp no asar mode should shim two different app folders 5`] = `
+{
+  "Contents/Info.plist": {},
+}
+`;
--- a/test/index.spec.ts
+++ b/test/index.spec.ts
@@ -1,20 +1,13 @@
-import { spawn } from '@malept/cross-spawn-promise';
 import * as fs from 'fs-extra';
 import * as path from 'path';

 import { makeUniversalApp } from '../dist/cjs/index';
+import { createTestApp, templateApp, VERIFY_APP_TIMEOUT, verifyApp } from './util';
+import { createPackage } from '@electron/asar';

 const appsPath = path.resolve(__dirname, 'fixtures', 'apps');
 const appsOutPath = path.resolve(__dirname, 'fixtures', 'apps', 'out');

-async function ensureUniversal(app: string) {
-  const exe = path.resolve(app, 'Contents', 'MacOS', 'Electron');
-  const result = await spawn(exe);
-  expect(result).toContain('arm64');
-  const result2 = await spawn('arch', ['-x86_64', exe]);
-  expect(result2).toContain('x64');
-}
-
 // See `jest.setup.ts` for app fixture setup process
 describe('makeUniversalApp', () => {
  afterEach(async () => {
@@ -49,110 +42,162 @@ describe('makeUniversalApp', () => {
      ).rejects.toThrow(/The out path ".*" already exists and force is not set to true/);
    });

-    it('packages successfully if `out` bundle already exists and `force` is `true`', async () => {
-      const out = path.resolve(appsOutPath, 'Error.app');
-      await fs.mkdirp(out);
-      await makeUniversalApp({
-        x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
-        arm64AppPath: path.resolve(appsPath, 'Arm64Asar.app'),
-        outAppPath: out,
-        force: true,
-      });
-      await ensureUniversal(out);
-      // Only a single asar as they were identical
-      expect(
-        (await fs.readdir(path.resolve(out, 'Contents', 'Resources'))).filter((p) =>
-          p.endsWith('asar'),
-        ),
-      ).toEqual(['app.asar']);
-    }, 60000);
+    it(
+      'packages successfully if `out` bundle already exists and `force` is `true`',
+      async () => {
+        const out = path.resolve(appsOutPath, 'Error.app');
+        await fs.mkdirp(out);
+        await makeUniversalApp({
+          x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
+          arm64AppPath: path.resolve(appsPath, 'Arm64Asar.app'),
+          outAppPath: out,
+          force: true,
+        });
+        await verifyApp(out);
+      },
+      VERIFY_APP_TIMEOUT,
+    );
  });

  describe('asar mode', () => {
-    it('should correctly merge two identical asars', async () => {
-      const out = path.resolve(appsOutPath, 'MergedAsar.app');
-      await makeUniversalApp({
-        x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
-        arm64AppPath: path.resolve(appsPath, 'Arm64Asar.app'),
-        outAppPath: out,
-      });
-      await ensureUniversal(out);
-      // Only a single asar as they were identical
-      expect(
-        (await fs.readdir(path.resolve(out, 'Contents', 'Resources'))).filter((p) =>
-          p.endsWith('asar'),
-        ),
-      ).toEqual(['app.asar']);
-    }, 60000);
+    it(
+      'should correctly merge two identical asars',
+      async () => {
+        const out = path.resolve(appsOutPath, 'MergedAsar.app');
+        await makeUniversalApp({
+          x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
+          arm64AppPath: path.resolve(appsPath, 'Arm64Asar.app'),
+          outAppPath: out,
+        });
+        await verifyApp(out);
+      },
+      VERIFY_APP_TIMEOUT,
+    );

-    it('should create a shim if asars are different between architectures', async () => {
-      const out = path.resolve(appsOutPath, 'ShimmedAsar.app');
-      await makeUniversalApp({
-        x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
-        arm64AppPath: path.resolve(appsPath, 'Arm64AsarExtraFile.app'),
-        outAppPath: out,
-      });
-      await ensureUniversal(out);
-      // We have three asars including the arch-agnostic shim
-      expect(
-        (await fs.readdir(path.resolve(out, 'Contents', 'Resources')))
-          .filter((p) => p.endsWith('asar'))
-          .sort(),
-      ).toEqual(['app.asar', 'app-x64.asar', 'app-arm64.asar'].sort());
-    }, 60000);
+    it(
+      'should create a shim if asars are different between architectures',
+      async () => {
+        const out = path.resolve(appsOutPath, 'ShimmedAsar.app');
+        await makeUniversalApp({
+          x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
+          arm64AppPath: path.resolve(appsPath, 'Arm64AsarExtraFile.app'),
+          outAppPath: out,
+        });
+        await verifyApp(out);
+      },
+      VERIFY_APP_TIMEOUT,
+    );

-    it('should merge two different asars when `mergeASARs` is enabled', async () => {
-      const out = path.resolve(appsOutPath, 'MergedAsar.app');
-      await makeUniversalApp({
-        x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
-        arm64AppPath: path.resolve(appsPath, 'Arm64AsarExtraFile.app'),
-        outAppPath: out,
-        mergeASARs: true,
-        singleArchFiles: 'extra-file.txt',
-      });
-      await ensureUniversal(out);
-      // Only a single merged asar
-      expect(
-        (await fs.readdir(path.resolve(out, 'Contents', 'Resources'))).filter((p) =>
-          p.endsWith('asar'),
-        ),
-      ).toEqual(['app.asar']);
-    }, 60000);
-
-    it('throws an error if `mergeASARs` is enabled and `singleArchFiles` is missing a unique file', async () => {
-      const out = path.resolve(appsOutPath, 'Error.app');
-      await expect(
-        makeUniversalApp({
+    it(
+      'should merge two different asars when `mergeASARs` is enabled',
+      async () => {
+        const out = path.resolve(appsOutPath, 'MergedAsar.app');
+        await makeUniversalApp({
          x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
          arm64AppPath: path.resolve(appsPath, 'Arm64AsarExtraFile.app'),
          outAppPath: out,
          mergeASARs: true,
-          singleArchFiles: 'bad-rule',
-        }),
-      ).rejects.toThrow(/Detected unique file "extra-file\.txt"/);
-    }, 60000);
+          singleArchFiles: 'extra-file.txt',
+        });
+        await verifyApp(out);
+      },
+      VERIFY_APP_TIMEOUT,
+    );

-    it.todo('should not inject ElectronAsarIntegrity into `infoPlistsToIgnore`');
+    it(
+      'throws an error if `mergeASARs` is enabled and `singleArchFiles` is missing a unique file',
+      async () => {
+        const out = path.resolve(appsOutPath, 'Error.app');
+        await expect(
+          makeUniversalApp({
+            x64AppPath: path.resolve(appsPath, 'X64Asar.app'),
+            arm64AppPath: path.resolve(appsPath, 'Arm64AsarExtraFile.app'),
+            outAppPath: out,
+            mergeASARs: true,
+            singleArchFiles: 'bad-rule',
+          }),
+        ).rejects.toThrow(/Detected unique file "extra-file\.txt"/);
+      },
+      VERIFY_APP_TIMEOUT,
+    );
+
+    it(
+      'should not inject ElectronAsarIntegrity into `infoPlistsToIgnore`',
+      async () => {
+        const arm64AppPath = await templateApp('Arm64-1.app', 'arm64', async (appPath) => {
+          const { testPath } = await createTestApp('Arm64-1');
+          await createPackage(testPath, path.resolve(appPath, 'Contents', 'Resources', 'app.asar'));
+          await templateApp('SubApp-1.app', 'arm64', async (subArm64AppPath) => {
+            await fs.move(
+              subArm64AppPath,
+              path.resolve(appPath, 'Contents', 'Resources', path.basename(subArm64AppPath)),
+            );
+          });
+        });
+        const x64AppPath = await templateApp('X64-1.app', 'x64', async (appPath) => {
+          const { testPath } = await createTestApp('X64-1');
+          await createPackage(testPath, path.resolve(appPath, 'Contents', 'Resources', 'app.asar'));
+          await templateApp('SubApp-1.app', 'x64', async (subArm64AppPath) => {
+            await fs.move(
+              subArm64AppPath,
+              path.resolve(appPath, 'Contents', 'Resources', path.basename(subArm64AppPath)),
+            );
+          });
+        });
+        const outAppPath = path.resolve(appsOutPath, 'UnmodifiedPlist.app');
+        await makeUniversalApp({
+          x64AppPath,
+          arm64AppPath,
+          outAppPath,
+          mergeASARs: true,
+          infoPlistsToIgnore: 'SubApp-1.app/Contents/Info.plist',
+        });
+        await verifyApp(outAppPath);
+      },
+      VERIFY_APP_TIMEOUT,
+    );
  });

  describe('no asar mode', () => {
-    it('should correctly merge two identical app folders', async () => {
-      const out = path.resolve(appsOutPath, 'MergedNoAsar.app');
-      await makeUniversalApp({
-        x64AppPath: path.resolve(appsPath, 'X64NoAsar.app'),
-        arm64AppPath: path.resolve(appsPath, 'Arm64NoAsar.app'),
-        outAppPath: out,
-      });
-      await ensureUniversal(out);
-      // Only a single app folder as they were identical
-      expect(
-        (await fs.readdir(path.resolve(out, 'Contents', 'Resources'))).filter((p) =>
-          p.startsWith('app'),
-        ),
-      ).toEqual(['app']);
-    }, 60000);
+    it(
+      'should correctly merge two identical app folders',
+      async () => {
+        const out = path.resolve(appsOutPath, 'MergedNoAsar.app');
+        await makeUniversalApp({
+          x64AppPath: path.resolve(appsPath, 'X64NoAsar.app'),
+          arm64AppPath: path.resolve(appsPath, 'Arm64NoAsar.app'),
+          outAppPath: out,
+        });
+        await verifyApp(out);
+      },
+      VERIFY_APP_TIMEOUT,
+    );

-    it.todo('should shim two different app folders');
+    it(
+      'should shim two different app folders',
+      async () => {
+        const arm64AppPath = await templateApp('ShimArm64.app', 'arm64', async (appPath) => {
+          const { testPath } = await createTestApp('shimArm64', {
+            'i-aint-got-no-rhythm.bin': 'boomshakalaka',
+          });
+          await fs.copy(testPath, path.resolve(appPath, 'Contents', 'Resources', 'app'));
+        });
+
+        const x64AppPath = await templateApp('ShimX64.app', 'x64', async (appPath) => {
+          const { testPath } = await createTestApp('shimX64', { 'hello-world.bin': 'Hello World' });
+          await fs.copy(testPath, path.resolve(appPath, 'Contents', 'Resources', 'app'));
+        });
+
+        const outAppPath = path.resolve(appsOutPath, 'ShimNoAsar.app');
+        await makeUniversalApp({
+          x64AppPath,
+          arm64AppPath,
+          outAppPath,
+        });
+        await verifyApp(outAppPath);
+      },
+      VERIFY_APP_TIMEOUT,
+    );
  });

  // TODO: Add tests for
--- a/test/util.ts
+++ b/test/util.ts
@@ -0,0 +1,180 @@
+import { downloadArtifact } from '@electron/get';
+import { spawn } from '@malept/cross-spawn-promise';
+import * as zip from 'cross-zip';
+import * as fs from 'fs-extra';
+import * as path from 'path';
+import plist from 'plist';
+import * as fileUtils from '../dist/cjs/file-utils';
+import { getRawHeader } from '@electron/asar';
+
+// We do a LOT of verifications in `verifyApp` 😅
+// exec universal binary -> verify ALL asars -> verify ALL app dirs -> verify ALL asar integrity entries
+// plus some tests create fixtures at runtime
+export const VERIFY_APP_TIMEOUT = 80 * 1000;
+
+export const asarsDir = path.resolve(__dirname, 'fixtures', 'asars');
+export const appsDir = path.resolve(__dirname, 'fixtures', 'apps');
+
+export const verifyApp = async (appPath: string) => {
+  await ensureUniversal(appPath);
+
+  const resourcesDir = path.resolve(appPath, 'Contents', 'Resources');
+  const resourcesDirContents = await fs.readdir(resourcesDir);
+
+  // sort for consistent result
+  const asars = resourcesDirContents.filter((p) => p.endsWith('.asar')).sort();
+  for await (const asar of asars) {
+    // verify header
+    const asarFs = getRawHeader(path.resolve(resourcesDir, asar));
+    expect(removeUnstableProperties(asarFs.header)).toMatchSnapshot();
+  }
+
+  // check all app and unpacked dirs (incl. shimmed)
+  const dirsToSnapshot = [
+    'app',
+    'app.asar.unpacked',
+    'app-x64',
+    'app-x64.asar.unpacked',
+    'app-arm64',
+    'app-arm64.asar.unpacked',
+  ];
+  const appDirs = resourcesDirContents
+    .filter((p) => dirsToSnapshot.includes(path.basename(p)))
+    .sort();
+  for await (const dir of appDirs) {
+    await verifyFileTree(path.resolve(resourcesDir, dir));
+  }
+
+  const allFiles = await fileUtils.getAllAppFiles(appPath);
+  const infoPlists = allFiles
+    .filter(
+      (appFile) =>
+        appFile.type === fileUtils.AppFileType.INFO_PLIST &&
+        // These are test app fixtures, no need to snapshot within `TestApp.app/Contents/Frameworks`
+        !appFile.relativePath.includes(path.join('Contents', 'Frameworks')),
+    )
+    .map((af) => af.relativePath)
+    .sort();
+
+  const integrityMap: Record<string, string> = {};
+  const integrity = await Promise.all(
+    infoPlists.map((ip) => extractAsarIntegrity(path.resolve(appPath, ip))),
+  );
+  for (let i = 0; i < integrity.length; i++) {
+    const relativePath = infoPlists[i];
+    const asarIntegrity = integrity[i];
+    integrityMap[relativePath] = asarIntegrity;
+  }
+  expect(integrityMap).toMatchSnapshot();
+};
+
+// note: `infoPlistsToIgnore` will not have integrity in sub-app plists
+const extractAsarIntegrity = async (infoPlist: string) => {
+  const { ElectronAsarIntegrity: integrity, ...otherData } = plist.parse(
+    await fs.readFile(infoPlist, 'utf-8'),
+  ) as any;
+  return integrity;
+};
+
+export const verifyFileTree = async (dirPath: string) => {
+  const dirFiles = await fileUtils.getAllAppFiles(dirPath);
+  const files = dirFiles.map((file) => {
+    const it = path.join(dirPath, file.relativePath);
+    const name = toSystemIndependentPath(file.relativePath);
+    if (it.endsWith('.txt') || it.endsWith('.json')) {
+      return { name, content: fs.readFileSync(it, 'utf-8') };
+    }
+    return name;
+  });
+  expect(files).toMatchSnapshot();
+};
+
+export const ensureUniversal = async (app: string) => {
+  const exe = path.resolve(app, 'Contents', 'MacOS', 'Electron');
+  const result = await spawn(exe);
+  expect(result).toContain('arm64');
+  const result2 = await spawn('arch', ['-x86_64', exe]);
+  expect(result2).toContain('x64');
+};
+
+export const toSystemIndependentPath = (s: string): string => {
+  return path.sep === '/' ? s : s.replace(/\\/g, '/');
+};
+
+export const removeUnstableProperties = (data: any) => {
+  return JSON.parse(
+    JSON.stringify(data, (name, value) => {
+      if (name === 'offset') {
+        return undefined;
+      }
+      return value;
+    }),
+  );
+};
+
+/**
+ * Directory structure:
+ * testName
+ * ├── private
+ * │   └── var
+ * │       ├── app
+ * │       │   └── file.txt -> ../file.txt
+ * │       └── file.txt
+ * └── var -> private/var
+ * ├── index.js
+ * ├── package.json
+ */
+export const createTestApp = async (
+  testName: string | undefined,
+  additionalFiles: Record<string, string> = {},
+) => {
+  const outDir = (testName || 'app') + Math.floor(Math.random() * 100); // tests run in parallel, randomize dir suffix to prevent naming collisions
+  const testPath = path.join(appsDir, outDir);
+  await fs.remove(testPath);
+
+  await fs.copy(path.join(asarsDir, 'app'), testPath);
+
+  const privateVarPath = path.join(testPath, 'private', 'var');
+  const varPath = path.join(testPath, 'var');
+
+  await fs.mkdir(privateVarPath, { recursive: true });
+  await fs.symlink(path.relative(testPath, privateVarPath), varPath);
+
+  const files = {
+    'file.txt': 'hello world',
+    ...additionalFiles,
+  };
+  for await (const [filename, fileData] of Object.entries(files)) {
+    const originFilePath = path.join(varPath, filename);
+    await fs.writeFile(originFilePath, fileData);
+  }
+  const appPath = path.join(varPath, 'app');
+  await fs.mkdirp(appPath);
+  await fs.symlink('../file.txt', path.join(appPath, 'file.txt'));
+
+  return {
+    testPath,
+    varPath,
+    appPath,
+  };
+};
+
+export const templateApp = async (
+  name: string,
+  arch: string,
+  modify: (appPath: string) => Promise<void>,
+) => {
+  const electronZip = await downloadArtifact({
+    artifactName: 'electron',
+    version: '27.0.0',
+    platform: 'darwin',
+    arch,
+  });
+  const appPath = path.resolve(appsDir, name);
+  zip.unzipSync(electronZip, appsDir);
+  await fs.rename(path.resolve(appsDir, 'Electron.app'), appPath);
+  await fs.remove(path.resolve(appPath, 'Contents', 'Resources', 'default_app.asar'));
+  await modify(appPath);
+
+  return appPath;
+};