test: Add load-json-file auto-mock, employ in lifecycle scripts

commands/__mocks__/load-json-file.js

@@ -0,0 +1,41 @@
+"use strict";
+
+const path = require("path");
+const normalizePath = require("normalize-path");
+
+const loadJsonFile = require.requireActual("load-json-file");
+const asyncRegistry = new Map();
+const syncRegistry = new Map();
+
+function incrementCalled(registry, manifestLocation) {
+  // tempy creates dirnames that are 32 characters long, but we want a readable key
+  const subPath = manifestLocation.split(/[0-9a-f]{32}/).pop();
+  const key = normalizePath(path.dirname(subPath));
+
+  // keyed off directory subpath, _not_ pkg.name (we don't know it yet)
+  registry.set(key, (registry.get(key) || 0) + 1);
+}
+
+// by default, act like a spy that counts number of times each location was loaded
+const mockLoadJsonFile = jest.fn(manifestLocation => {
+  incrementCalled(asyncRegistry, manifestLocation);
+
+  return loadJsonFile(manifestLocation);
+});
+
+const mockLoadJsonFileSync = jest.fn(manifestLocation => {
+  incrementCalled(syncRegistry, manifestLocation);
+
+  return loadJsonFile.sync(manifestLocation);
+});
+
+// keep test data isolated
+afterEach(() => {
+  asyncRegistry.clear();
+  syncRegistry.clear();
+});
+
+module.exports = mockLoadJsonFile;
+module.exports.registry = asyncRegistry;
+module.exports.sync = mockLoadJsonFileSync;
+module.exports.sync.registry = syncRegistry;

commands/publish/__tests__/publish-lifecycle-scripts.test.js

@@ -12,6 +12,7 @@ jest.mock("../../version/lib/remote-branch-exists");
 
 // mocked modules
 const runLifecycle = require("@lerna/run-lifecycle");
+const loadJsonFile = require("load-json-file");
 
 // helpers
 const initFixture = require("@lerna-test/init-fixture")(__dirname);
@@ -67,5 +68,12 @@ describe("lifecycle scripts", () => {
       ["package-1", "postpublish"],
       ["lifecycle", "postpublish"],
     ]);
+
+    expect(loadJsonFile.registry).toMatchInlineSnapshot(`
+Map {
+  "/packages/package-1" => 2,
+  "/packages/package-2" => 2,
+}
+`);
   });
 });

commands/version/__tests__/version-lifecycle-scripts.test.js

@@ -10,6 +10,7 @@ const path = require("path");
 
 // mocked modules
 const runLifecycle = require("@lerna/run-lifecycle");
+const loadJsonFile = require("load-json-file");
 
 // helpers
 const initFixture = require("@lerna-test/init-fixture")(path.resolve(__dirname, "../../publish/__tests__"));
@@ -45,5 +46,12 @@ describe("lifecycle scripts", () => {
       ["package-1", "postversion"],
       ["lifecycle", "postversion"],
     ]);
+
+    expect(loadJsonFile.registry).toMatchInlineSnapshot(`
+Map {
+  "/packages/package-1" => 1,
+  "/packages/package-2" => 1,
+}
+`);
   });
 });