Don't ring large groups

ts/test-both/conversations/isConversationTooBigToRing_test.ts

@@ -0,0 +1,61 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { assert } from 'chai';
+import * as sinon from 'sinon';
+import { times } from 'lodash';
+import { v4 as uuid } from 'uuid';
+import * as remoteConfig from '../../RemoteConfig';
+
+import { isConversationTooBigToRing } from '../../conversations/isConversationTooBigToRing';
+
+describe('isConversationTooBigToRing', () => {
+  let sinonSandbox: sinon.SinonSandbox;
+  let getMaxGroupCallRingSizeStub: sinon.SinonStub;
+
+  beforeEach(() => {
+    sinonSandbox = sinon.createSandbox();
+
+    const getValueStub = sinonSandbox.stub(remoteConfig, 'getValue');
+    getMaxGroupCallRingSizeStub = getValueStub.withArgs(
+      'global.calling.maxGroupCallRingSize'
+    );
+  });
+
+  const fakeMemberships = (count: number) =>
+    times(count, () => ({ conversationId: uuid(), isAdmin: false }));
+
+  afterEach(() => {
+    sinonSandbox.restore();
+  });
+
+  it('returns false if there are no memberships (i.e., for a direct conversation)', () => {
+    assert.isFalse(isConversationTooBigToRing({}));
+    assert.isFalse(isConversationTooBigToRing({ memberships: [] }));
+  });
+
+  const textMaximum = (max: number): void => {
+    for (let count = 1; count < max; count += 1) {
+      const memberships = fakeMemberships(count);
+      assert.isFalse(isConversationTooBigToRing({ memberships }));
+    }
+    for (let count = max; count < max + 5; count += 1) {
+      const memberships = fakeMemberships(count);
+      assert.isTrue(isConversationTooBigToRing({ memberships }));
+    }
+  };
+
+  it('returns whether there are 16 or more people in the group, if there is nothing in remote config', () => {
+    textMaximum(16);
+  });
+
+  it('returns whether there are 16 or more people in the group, if the remote config value is bogus', () => {
+    getMaxGroupCallRingSizeStub.returns('uh oh');
+    textMaximum(16);
+  });
+
+  it('returns whether there are 9 or more people in the group, if the remote config value is 9', () => {
+    getMaxGroupCallRingSizeStub.returns('9');
+    textMaximum(9);
+  });
+});