Support for creating New Groups

ts/test-both/util/parseIntWithFallback_test.ts

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+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+
+import { parseIntWithFallback } from '../../util/parseIntWithFallback';
+
+describe('parseIntWithFallback', () => {
+  describe('when passed a number argument', () => {
+    it('returns the number when passed an integer', () => {
+      assert.strictEqual(parseIntWithFallback(0, -1), 0);
+      assert.strictEqual(parseIntWithFallback(123, -1), 123);
+      assert.strictEqual(parseIntWithFallback(-123, -1), -123);
+    });
+
+    it('returns the fallback when passed a decimal value', () => {
+      assert.strictEqual(parseIntWithFallback(0.2, -1), -1);
+      assert.strictEqual(parseIntWithFallback(1.23, -1), -1);
+    });
+
+    it('returns the fallback when passed NaN', () => {
+      assert.strictEqual(parseIntWithFallback(NaN, -1), -1);
+    });
+
+    it('returns the fallback when passed ∞', () => {
+      assert.strictEqual(parseIntWithFallback(Infinity, -1), -1);
+      assert.strictEqual(parseIntWithFallback(-Infinity, -1), -1);
+    });
+  });
+
+  describe('when passed a string argument', () => {
+    it('returns the number when passed an integer', () => {
+      assert.strictEqual(parseIntWithFallback('0', -1), 0);
+      assert.strictEqual(parseIntWithFallback('123', -1), 123);
+      assert.strictEqual(parseIntWithFallback('-123', -1), -123);
+    });
+
+    it('parses decimal values like parseInt', () => {
+      assert.strictEqual(parseIntWithFallback('0.2', -1), 0);
+      assert.strictEqual(parseIntWithFallback('12.34', -1), 12);
+      assert.strictEqual(parseIntWithFallback('-12.34', -1), -12);
+    });
+
+    it('parses values in base 10', () => {
+      assert.strictEqual(parseIntWithFallback('0x12', -1), 0);
+    });
+
+    it('returns the fallback when passed non-parseable strings', () => {
+      assert.strictEqual(parseIntWithFallback('', -1), -1);
+      assert.strictEqual(parseIntWithFallback('uh 123', -1), -1);
+      assert.strictEqual(parseIntWithFallback('uh oh', -1), -1);
+    });
+  });
+
+  describe('when passed other arguments', () => {
+    it("returns the fallback when passed arguments that aren't strings or numbers", () => {
+      assert.strictEqual(parseIntWithFallback(null, -1), -1);
+      assert.strictEqual(parseIntWithFallback(undefined, -1), -1);
+      assert.strictEqual(parseIntWithFallback(['123'], -1), -1);
+    });
+
+    it('returns the fallback when passed a stringifiable argument, unlike parseInt', () => {
+      const obj = {
+        toString() {
+          return '123';
+        },
+      };
+      assert.strictEqual(parseIntWithFallback(obj, -1), -1);
+    });
+  });
+});