test: increase coverage for v3 Channels model to 100%

packages/parser/test/models/v3/channels.spec.ts

@@ -0,0 +1,53 @@
+import { Channels } from '../../../src/models/v3/channels';
+
+describe('Channels model', function() {
+  // Mock Helper: Creates a fake Channel that behaves exactly how we need
+  const createMockChannel = (id: string, hasSend = false, hasReceive = false) => ({
+    id: () => id,
+    operations: () => ({
+      filterBySend: () => hasSend ? ['op1'] : [],
+      filterByReceive: () => hasReceive ? ['op1'] : []
+    })
+  } as any);
+
+  it('should handle empty channels', function() {
+    const channels = new Channels([]); // Pass an Array!
+    expect(channels.isEmpty()).toEqual(true);
+    expect(channels.all()).toEqual([]);
+  });
+
+  it('should find a channel by id', function() {
+    const mock1 = createMockChannel('userSignup');
+    const mock2 = createMockChannel('userLogout');
+
+    // Pass Array of Mocks
+    const channels = new Channels([mock1, mock2]); 
+
+    expect(channels.isEmpty()).toEqual(false);
+    expect(channels.has('userSignup')).toEqual(true);
+    expect(channels.get('userSignup')).toBe(mock1);
+    expect(channels.get('missing')).toBeUndefined();
+  });
+
+  it('should filter channels by "send" operations', function() {
+    const sender = createMockChannel('sender', true, false);
+    const receiver = createMockChannel('receiver', false, true);
+
+    const channels = new Channels([sender, receiver]);
+
+    const senders = channels.filterBySend();
+    expect(senders).toHaveLength(1);
+    expect(senders[0].id()).toEqual('sender');
+  });
+
+  it('should filter channels by "receive" operations', function() {
+    const sender = createMockChannel('sender', true, false);
+    const receiver = createMockChannel('receiver', false, true);
+
+    const channels = new Channels([sender, receiver]);
+
+    const receivers = channels.filterByReceive();
+    expect(receivers).toHaveLength(1);
+    expect(receivers[0].id()).toEqual('receiver');
+  });
+});