larry babby and threejs for glsl

webGl/my-threejs-test/node_modules/@parcel/utils/test/DefaultMap.test.js

@@ -0,0 +1,41 @@
+// @flow strict-local
+
+import assert from 'assert';
+import {DefaultMap} from '../src/DefaultMap';
+
+describe('DefaultMap', () => {
+  it('constructs with entries just like Map', () => {
+    let map = new DefaultMap(
+      k => k,
+      [
+        [1, 3],
+        [2, 27],
+      ],
+    );
+    assert.equal(map.get(1), 3);
+    assert.deepEqual(Array.from(map.entries()), [
+      [1, 3],
+      [2, 27],
+    ]);
+  });
+
+  it("returns a default value based on a key if it doesn't exist", () => {
+    let map = new DefaultMap(k => k);
+    assert.equal(map.get(3), 3);
+  });
+
+  it("sets a default value based on a key if it doesn't exist", () => {
+    let map = new DefaultMap(k => k);
+    map.get(3);
+    assert.deepEqual(Array.from(map.entries()), [[3, 3]]);
+  });
+
+  it('respects undefined/null if it already existed in the map', () => {
+    let map = new DefaultMap<number, number | void | null>(k => k);
+    map.set(3, undefined);
+    assert.equal(map.get(3), undefined);
+
+    map.set(4, null);
+    assert.equal(map.get(4), null);
+  });
+});