test: add HttpInstrumentation so an initial span is created, then Koa spans are created; add asserts for the expected spans

Author: trentm

package-lock.json

@@ -50,6 +50,7 @@
     "@opentelemetry/api": "^1.3.0",
     "@opentelemetry/context-async-hooks": "^1.8.0",
     "@opentelemetry/contrib-test-utils": "^0.35.0",
+    "@opentelemetry/instrumentation-http": "^0.45.1",
     "@opentelemetry/sdk-trace-base": "^1.8.0",
     "@opentelemetry/sdk-trace-node": "^1.8.0",
     "@types/mocha": "7.0.2",

plugins/node/opentelemetry-instrumentation-koa/package.json

@@ -19,12 +19,14 @@
 
 import { createTestNodeSdk } from '@opentelemetry/contrib-test-utils';
 
+import { HttpInstrumentation } from '@opentelemetry/instrumentation-http';
 import { KoaInstrumentation } from '../../build/src/index.js';
 
 const sdk = createTestNodeSdk({
   serviceName: 'use-koa',
   instrumentations: [
-    new KoaInstrumentation()
+    new KoaInstrumentation(),
+    new HttpInstrumentation()
   ]
 })
 sdk.start();
@@ -35,7 +37,7 @@ import * as http from 'http';
 
 const app = new Koa();
 
-app.use(async function simpleResponse(ctx, next) {
+app.use(async function simpleMiddleware(ctx, next) {
   await next();
 });
 

plugins/node/opentelemetry-instrumentation-koa/test/fixtures/use-koa.mjs

@@ -15,7 +15,7 @@
  */
 
 import * as KoaRouter from '@koa/router';
-import { context, trace, Span } from '@opentelemetry/api';
+import { context, trace, Span, SpanKind } from '@opentelemetry/api';
 import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';
 import { AsyncHooksContextManager } from '@opentelemetry/context-async-hooks';
 import * as testUtils from '@opentelemetry/contrib-test-utils';
@@ -724,11 +724,21 @@ describe('Koa Instrumentation', () => {
         assert.ifError(err);
       },
       checkCollector: (collector: testUtils.TestCollector) => {
+        // use-koa.mjs creates a Koa app with a 'GET /post/:id' endpoint and
+        // a `simpleMiddleware`, then makes a single 'GET /post/0' request. We
+        // expect to see spans like this:
+        //    span 'GET /post/:id'
+        //    `- span 'middleware - simpleResponse'
+        //       `- span 'router - /post/:id'
         const spans = collector.sortedSpans;
-
-        console.log(JSON.stringify(spans, null, 2));
-
-        // TODO
+        assert.strictEqual(spans[0].name, 'GET /post/:id');
+        assert.strictEqual(spans[0].kind, SpanKind.CLIENT);
+        assert.strictEqual(spans[1].name, 'middleware - simpleMiddleware');
+        assert.strictEqual(spans[1].kind, SpanKind.SERVER);
+        assert.strictEqual(spans[1].parentSpanId, spans[0].spanId);
+        assert.strictEqual(spans[2].name, 'router - /post/:id');
+        assert.strictEqual(spans[2].kind, SpanKind.SERVER);
+        assert.strictEqual(spans[2].parentSpanId, spans[1].spanId);
       },
     });
   });