1 files changed, 126 insertions, 0 deletions
diff --git a/packages/order-watcher/test/event_watcher_test.ts b/packages/order-watcher/test/event_watcher_test.ts
new file mode 100644
index 000000000..b4eca315e
--- /dev/null
+++ b/packages/order-watcher/test/event_watcher_test.ts
@@ -0,0 +1,126 @@
+import { callbackErrorReporter, web3Factory } from '@0xproject/dev-utils';
+import { DoneCallback, LogEntry, LogEntryEvent } from '@0xproject/types';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import * as chai from 'chai';
+import * as _ from 'lodash';
+import 'mocha';
+import * as Sinon from 'sinon';
+
+import { EventWatcher } from '../src/order_watcher/event_watcher';
+
+import { chaiSetup } from './utils/chai_setup';
+import { provider } from './utils/web3_wrapper';
+
+chaiSetup.configure();
+const expect = chai.expect;
+
+describe('EventWatcher', () => {
+    let stubs: Sinon.SinonStub[] = [];
+    let eventWatcher: EventWatcher;
+    let web3Wrapper: Web3Wrapper;
+    const logA: LogEntry = {
+        address: '0x71d271f8b14adef568f8f28f1587ce7271ac4ca5',
+        blockHash: null,
+        blockNumber: null,
+        data: '',
+        logIndex: null,
+        topics: [],
+        transactionHash: '0x004881d38cd4a8f72f1a0d68c8b9b8124504706041ff37019c1d1ed6bfda8e17',
+        transactionIndex: 0,
+    };
+    const logB: LogEntry = {
+        address: '0x8d12a197cb00d4747a1fe03395095ce2a5cc6819',
+        blockHash: null,
+        blockNumber: null,
+        data: '',
+        logIndex: null,
+        topics: ['0xf341246adaac6f497bc2a656f546ab9e182111d630394f0c57c710a59a2cb567'],
+        transactionHash: '0x01ef3c048b18d9b09ea195b4ed94cf8dd5f3d857a1905ff886b152cfb1166f25',
+        transactionIndex: 0,
+    };
+    const logC: LogEntry = {
+        address: '0x1d271f8b174adef58f1587ce68f8f27271ac4ca5',
+        blockHash: null,
+        blockNumber: null,
+        data: '',
+        logIndex: null,
+        topics: ['0xf341246adaac6f497bc2a656f546ab9e182111d630394f0c57c710a59a2cb567'],
+        transactionHash: '0x01ef3c048b18d9b09ea195b4ed94cf8dd5f3d857a1905ff886b152cfb1166f25',
+        transactionIndex: 0,
+    };
+    before(async () => {
+        const pollingIntervalMs = 10;
+        web3Wrapper = new Web3Wrapper(provider);
+        eventWatcher = new EventWatcher(web3Wrapper, pollingIntervalMs);
+    });
+    afterEach(() => {
+        // clean up any stubs after the test has completed
+        _.each(stubs, s => s.restore());
+        stubs = [];
+        eventWatcher.unsubscribe();
+    });
+    it('correctly emits initial log events', (done: DoneCallback) => {
+        const logs: LogEntry[] = [logA, logB];
+        const expectedLogEvents = [
+            {
+                removed: false,
+                ...logA,
+            },
+            {
+                removed: false,
+                ...logB,
+            },
+        ];
+        const getLogsStub = Sinon.stub(web3Wrapper, 'getLogsAsync');
+        getLogsStub.onCall(0).returns(logs);
+        stubs.push(getLogsStub);
+        const expectedToBeCalledOnce = false;
+        const callback = callbackErrorReporter.reportNodeCallbackErrors(done, expectedToBeCalledOnce)(
+            (event: LogEntryEvent) => {
+                const expectedLogEvent = expectedLogEvents.shift();
+                expect(event).to.be.deep.equal(expectedLogEvent);
+                if (_.isEmpty(expectedLogEvents)) {
+                    done();
+                }
+            },
+        );
+        eventWatcher.subscribe(callback);
+    });
+    it('correctly computes the difference and emits only changes', (done: DoneCallback) => {
+        const initialLogs: LogEntry[] = [logA, logB];
+        const changedLogs: LogEntry[] = [logA, logC];
+        const expectedLogEvents = [
+            {
+                removed: false,
+                ...logA,
+            },
+            {
+                removed: false,
+                ...logB,
+            },
+            {
+                removed: true,
+                ...logB,
+            },
+            {
+                removed: false,
+                ...logC,
+            },
+        ];
+        const getLogsStub = Sinon.stub(web3Wrapper, 'getLogsAsync');
+        getLogsStub.onCall(0).returns(initialLogs);
+        getLogsStub.onCall(1).returns(changedLogs);
+        stubs.push(getLogsStub);
+        const expectedToBeCalledOnce = false;
+        const callback = callbackErrorReporter.reportNodeCallbackErrors(done, expectedToBeCalledOnce)(
+            (event: LogEntryEvent) => {
+                const expectedLogEvent = expectedLogEvents.shift();
+                expect(event).to.be.deep.equal(expectedLogEvent);
+                if (_.isEmpty(expectedLogEvents)) {
+                    done();
+                }
+            },
+        );
+        eventWatcher.subscribe(callback);
+    });
+});