event-store-client/test/metadata/jsonEventMetadata.js

Client library for connecting to Event Store instances over TCP/IP

var assert = require("assert");
var EventStoreClient = require("../../index.js");
var dbconn = require("../common/dbconn");

var defaultHostName = dbconn.defaultHostName;
var credentials = dbconn.credentials;
var port = dbconn.port;

var streamId = "event-store-client-test";

describe("JSON Event Metadata", function() {
	describe("Reading JSON metadata from an event", function() {

		var testEventNumber = null;
		var testRunDate = new Date().toISOString();

		before("Writing a test event with metadata", function(done) {
			var events = [{
                eventId: EventStoreClient.Connection.createGuid(),
                eventType: "MetadataTestEvent",
                data: { comment: "Testing reading and writing event metadata" },
                metadata: { testRanAt: testRunDate }
            }];

            var connection = new EventStoreClient.Connection({ host: defaultHostName, port: port, onError: done });
            connection.writeEvents(streamId, EventStoreClient.ExpectedVersion.Any, false, events, credentials, function(completed) {
                testEventNumber = completed.firstEventNumber;
                connection.close();
                done();
            });
		});

		it("should have JSON metadata defined on the event", function(done) {
			var testEvent = null;
            var readSingleEvent = 1;

            var connection = new EventStoreClient.Connection({ host: defaultHostName, port: port, onError: done });
            connection.readStreamEventsBackward(streamId, testEventNumber, readSingleEvent, false, false, onEventAppeared, credentials, onCompleted);

            function onEventAppeared(event) { testEvent = event; }

			function onCompleted(completed) {
				assert.equal(completed.result, EventStoreClient.ReadStreamResult.Success,
					"Expected a result code of Success, not " + EventStoreClient.ReadStreamResult.getName(completed.result));

				assert.ok(testEvent.isJson === true,
					"Expected event to have JSON data");

				assert.equal(testRunDate, testEvent.metadata.testRanAt,
					"Expected metadata field 'testRanAt' to match date " + testRunDate);

				connection.close();
				done();
			};
		});
	});
});