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node_modules/lru-memoizer/test/lru-memoizer.freeze.test.js

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+const memoizer = require("./..");
+const assert = require("chai").assert;
+
+describe("lru-memoizer (freeze)", function () {
+  var loadTimes = 0,
+    memoized;
+
+  beforeEach(function () {
+    loadTimes = 0;
+
+    memoized = memoizer({
+      load: function (key, callback) {
+        loadTimes++;
+        callback(null, { foo: "bar", buffer: Buffer.from("1234") });
+      },
+      hash: function (key) {
+        return key;
+      },
+      freeze: true,
+    });
+  });
+
+  it("should return a freeze every time with the same cached structure", function (done) {
+    memoized("test", function (err, r1) {
+      assert.isNull(err);
+      assert.strictEqual(loadTimes, 1);
+      assert.equal(r1.foo, "bar");
+      r1.foo = "bax";
+      assert.isFrozen(r1);
+
+      memoized("test", function (err, r2) {
+        assert.isNull(err);
+
+        assert.strictEqual(loadTimes, 1);
+        assert.equal(r2.foo, "bar");
+        assert.strictEqual(r1, r2);
+        assert.isFrozen(r2);
+
+        done();
+      });
+    });
+  });
+});