How to use the typescript-ioc.Container.get function in typescript-ioc

beforeAll(function(done){
        config = Container.get(Configuration);
		if (config.loaded) {
			startGateway()
				.then(done)
				.catch(err => {
					console.error(err);
					fail(err);
				});	
		} else {
			config.on("load", () => {
				startGateway()
					.then(done)
					.catch(err => {
						console.error(err);
						fail(err);
					});	
			});

before(() => {
        config = Container.get(Configuration);
        gatewayRequest = request.defaults({ baseUrl: `http://localhost:${config.gateway.protocol.http.listenPort}` });
    });

before(() => {
        config = Container.get(Configuration);
        gatewayRequest = request.defaults({baseUrl: `http://localhost:${config.gateway.protocol.http.listenPort}`});
    });

before(() => {
        config = Container.get(Configuration);
        gatewayRequest = request.defaults({baseUrl: `http://localhost:${config.gateway.protocol.http.listenPort}`});

    });

before(() => {
        config = Container.get(Configuration);
        gatewayRequest = request.defaults({ baseUrl: `http://localhost:${config.gateway.protocol.http.listenPort}` });

    });

before(() => {
        config = Container.get(Configuration);
        gatewayRequest = request.defaults({baseUrl: `http://localhost:${config.gateway.protocol.http.listenPort}`});

    });

async function startGateway() {
        database = Container.get(Database);
        gateway = Container.get(Gateway);
        await database.redisClient.flushdb();
        await gateway.start();
        await gateway.startAdmin();
        gateway.server.set('env', 'test');
        sdk = await SDK.initialize({
            defaultHost: getSwaggerHost(config.gateway),
            swaggerUrl: getSwaggerUrl(config.gateway),
            token: generateSecurityToken(config.gateway)
        });
    }

before(async () => {
        config = Container.get(Configuration);
        database = Container.get(Database);
        gateway = Container.get(Gateway);

        sdk = await SDK.initialize({
            defaultHost: getSwaggerHost(config.gateway),
            swaggerUrl: getSwaggerUrl(config.gateway),
            token: generateSecurityToken(config.gateway)
        });
    });

return new Promise((resolve, reject) => {
            const swaggerUrl = `http://localhost:${config.gateway.admin.protocol.http.listenPort}/${config.gateway.admin.apiDocs.path}/json`;
            database = Container.get(Database);
            gateway = Container.get(Gateway);
            gateway.start()
            .then(() => gateway.startAdmin())
            .then(() => {
                gateway.server.set('env', 'test');
                gatewayRequest = request.defaults({baseUrl: `http://localhost:${config.gateway.protocol.http.listenPort}`});

                return database.redisClient.flushdb();
            })
            .then(() => createUser())
            .then((user) => SDK.initialize(swaggerUrl, 'config', '123test'))
            .then((s) => {
                sdk = s;
                return installMiddlewares();
            })
            .then(() => installApis())
            .then(resolve)

before(function(){
        config = Container.get(Configuration);
        if (config.loaded) {
            return startGateway();
        } else {
            return new Promise((resolve, reject) => {
                    config.on('load', () => {
                        startGateway()
                            .then(resolve)
                            .catch(reject);
                    });
            });
        }
    });