feat: add CollectionResponse model and tests

tests/CollectionResponse.spec.ts

@@ -0,0 +1,38 @@
+import { expect } from 'chai';
+import { CollectionResponse } from '../src/models/CollectionResponse';
+
+describe('CollectionResponse', function () {
+  it('should be defined', function () {
+    expect(CollectionResponse).to.not.be.undefined;
+  });
+
+  it('should have a constructor', function () {
+    expect(CollectionResponse).to.have.property('constructor');
+  });
+
+  it('should have 2 parameters', function () {
+    expect(CollectionResponse).to.have.lengthOf(2);
+  });
+
+  it('should create a new instance of the CollectionResponse class', function () {
+    expect(() => new CollectionResponse(200, [1, 2, 3])).to.not.throw();
+  });
+
+  it('should have a property named count', function () {
+    expect(new CollectionResponse(200, [1, 2, 3])).to.have.property('count');
+  });
+
+  it('should have a property named items', function () {
+    expect(new CollectionResponse(200, [1, 2, 3])).to.have.property('items');
+  });
+
+  it('should set the count property to the value passed to the constructor', function () {
+    expect(new CollectionResponse(200, [1, 2, 3]).count).to.equal(200);
+  });
+
+  it('should set the items property to the value passed to the constructor', function () {
+    expect(new CollectionResponse(200, [1, 2, 3]).items).to.deep.equal([
+      1, 2, 3,
+    ]);
+  });
+});