From 9cca46958cb6a37cd73d1e30f0ce265797786e2c Mon Sep 17 00:00:00 2001
From: "Kamat, Trivikram" <16024985+trivikr@users.noreply.github.com>
Date: Tue, 25 May 2021 08:44:46 -0700
Subject: [PATCH] test(TypedArrays): add tests for getPointerArray

---
 test/_utils.js | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/test/_utils.js b/test/_utils.js
index ea26716e..7e93043b 100644
--- a/test/_utils.js
+++ b/test/_utils.js
@@ -13,6 +13,38 @@ describe('utils', function() {
 
   describe('typed-arrays', function() {
 
+    describe('#.getPointerArray', function() {
+      var validatePointerArrayConstructor = function (min, max, expectedCtor) {
+        it(`returns ${expectedCtor} for ${min}`, () => {
+          assert.strictEqual(typed.getPointerArray(min), expectedCtor);
+        });
+        it(`returns ${expectedCtor} for ${(max - min) / 2}`, () => {
+          assert.strictEqual(typed.getPointerArray((max - min) / 2), expectedCtor);
+        });
+        it(`returns ${expectedCtor} for ${max}`, () => {
+          assert.strictEqual(typed.getPointerArray(max), expectedCtor);
+        });
+      };
+
+      describe('returns Uint8Array for capacity <= Math.pow(2, 8)', function() {
+        validatePointerArrayConstructor(0, Math.pow(2, 8), Uint8Array);
+      });
+
+      describe('returns Uint16Array for Math.pow(2, 8) < capacity <= Math.pow(2, 16)', function() {
+        validatePointerArrayConstructor(Math.pow(2, 8) + 1, Math.pow(2, 16), Uint16Array);
+      });
+
+      describe('returns Uint32Array for Math.pow(2, 16) < capacity <= Math.pow(2, 32)', function() {
+        validatePointerArrayConstructor(Math.pow(2, 16) + 1, Math.pow(2, 32), Uint32Array);
+      });
+
+      describe('throws error for capacity > Math.pow(2, 32)', function() {
+        assert.throws(function() {
+          typed.getPointerArray(Math.pow(2, 32) + 1);
+        }, /Pointer Array of size > 4294967295 is not supported/);
+      });
+    });
+
     describe('#.getMinimalRepresentation', function() {
 
       it('should return the correct type.', function() {