BE-834 Add unit test for the fix of memory leak issue

Signed-off-by: Atsushi Neki <nekiaiken@gmail.com>

.gitignore

@@ -27,7 +27,7 @@ first-network/channel-artifacts/*
 tmp/wallet/*
 wallet/*
 *.swp
-package-lock.json
+# package-lock.json
 ssl-certs/*.pem
 ssl-certs/*.csr
 0

.mocharc.json

@@ -0,0 +1,8 @@
+{
+	"require": "./node_modules/ts-node/register",
+	"watch-extensions": "ts",
+	"recursive": true,
+	"spec": ["./app/test/**/*.test.ts"],
+	"timeout": 5000,
+	"extension": ["ts"]
+}

.nycrc.json

@@ -0,0 +1,10 @@
+{
+	"extends": "@istanbuljs/nyc-config-typescript",
+	"require": ["ts-node/register"],
+	"extension": [".ts"],
+	"reporter": ["lcov", "text-summary"],
+	"sourceMap": true,
+	"instrument": true,
+	"temp-dir": "app/test/.nyc_output",
+	"report-dir": "app/test/coverage"
+}

app/test/FabricGateway.test.ts

@@ -0,0 +1,55 @@
+/*
+ *SPDX-License-Identifier: Apache-2.0
+ */
+
+/* tslint:disable:no-unused-expression */
+import { expect, use } from 'chai';
+import chaiAsPromised from 'chai-as-promised';
+import sinonChai from 'sinon-chai';
+import { FabricConfig } from '../platform/fabric/FabricConfig';
+
+use(chaiAsPromised);
+use(sinonChai);
+
+// export const expect = chai.expect
+import proxyquire from 'proxyquire';
+import sinon from 'sinon';
+import { assert } from 'console';
+// import { expect } from './expect'
+
+describe('setupDiscoveryRequest', () => {
+	it('should return without error', async () => {
+		const stubSign = sinon.stub();
+		const { FabricGateway } = proxyquire
+			.noCallThru()
+			.load('../platform/fabric/gateway/FabricGateway', {
+				'fabric-common': {
+					DiscoveryService: function() {
+						return {
+							build: sinon.stub(),
+							sign: stubSign
+						};
+					}
+				},
+				'../../../common/helper': {
+					helper: {
+						getLogger: function() {}
+					}
+				}
+			});
+
+		const config = new FabricConfig();
+		config.initialize('first-network', {
+			name: 'My first network',
+			profile: './connection-profile/first-network.json'
+		});
+
+		const gw = new FabricGateway(config);
+		const stubGetNetwork = sinon.stub(gw.gateway, 'getNetwork');
+		const stubGetChannel = sinon.stub();
+		stubGetChannel.returns({});
+		stubGetNetwork.returns(Promise.resolve({ getChannel: stubGetChannel }));
+		await gw.setupDiscoveryRequest('testChannel');
+		expect(stubSign.calledOnce).to.be.equal(true);
+	});
+});