add test for quering an open zipkin instance

.travis.yml

@@ -13,10 +13,13 @@ matrix:
       - 'cat coverage/lcov.info | ./node_modules/.bin/coveralls'
 
     # E2E Web
-    - install:
+    - services:
+      - docker
+      install:
       - cd example/react-example
       - yarn install
       before_script:
       - yarn run build
+      - docker run -d -p 9411:9411 openzipkin/zipkin
       script:
       - yarn test

example/react-example/cypress/integration/basic_spec.js

@@ -1,13 +1,24 @@
+import fetch from "node-fetch";
+
 describe("Basic", () => {
-  it("should be able interact with the basic example", () => {
-    cy.visit("/");
-    cy.get("#Basic").click();
-    cy.get("#buttonLabel").should($p => {
-      expect($p.first()).to.contain("Not-Pressed");
+  describe("Setup", () => {
+    it("should be able interact with the basic example", () => {
+      cy.visit("/");
+      cy.get("#Basic").click();
+      cy.get("#buttonLabel").should($p => {
+        expect($p.first()).to.contain("Not-Pressed");
+      });
+      cy.get("#basicButton").click();
+      cy.get("#buttonLabel").should($p => {
+        expect($p.first()).to.contain("Is-Pressed");
+      });
     });
-    cy.get("#basicButton").click();
-    cy.get("#buttonLabel").should($p => {
-      expect($p.first()).to.contain("Is-Pressed");
+
+    it("should be able to access zipkin", async () => {
+      const result = await fetch(
+        "http://localhost:9411/api/v1/spans?serviceName=frontend"
+      ).then(res => res.json());
+      expect(result).toEqual([]);
     });
   });
 });

example/react-example/package.json

@@ -16,6 +16,7 @@
   },
   "devDependencies": {
     "cypress": "^1.0.2",
+    "node-fetch": "^1.7.3",
     "serve": "^6.3.1"
   }
 }

example/react-example/yarn.lock

@@ -4565,7 +4565,7 @@ no-case@^2.2.0:
   dependencies:
     lower-case "^1.1.1"
 
-node-fetch@^1.0.1:
+node-fetch@^1.0.1, node-fetch@^1.7.3:
   version "1.7.3"
   resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-1.7.3.tgz#980f6f72d85211a5347c6b2bc18c5b84c3eb47ef"
   dependencies: