Add tests for utils

package.json

@@ -7,9 +7,11 @@
   "author": "sukantgujar <sukantgujar@yahoo.com>",
   "license": "MIT",
   "scripts": {
+    "clean": "rimraf ./dist",
+    "test": "tsc && mocha dist/**/*.spec.js",
     "build:watch": "npx tsc -w",
-    "build:prod": "rimraf ./dist && cross-env NODE_ENV=production tsc -p ./tsconfig.production.json",
-    "push": "yarn build:prod && yarn publish",
+    "build:prod": "yarn clean && cross-env NODE_ENV=production tsc -p ./tsconfig.production.json",
+    "push": "yarn test && yarn build:prod && yarn publish",
     "run:examples:file": "node ./dist/examples/express-file-server/index.js"
   },
   "keywords": [
@@ -18,11 +20,17 @@
     "stream"
   ],
   "devDependencies": {
+    "@types/chai": "^4.1.7",
     "@types/express": "^4.16.1",
+    "@types/mocha": "^5.2.6",
+    "@types/sinon": "^7.0.9",
+    "chai": "^4.2.0",
     "cross-env": "^5.2.0",
+    "express": "^4.16.4",
+    "mocha": "^6.0.2",
     "rimraf": "^2.6.3",
-    "typescript": "^3.3.3333",
-    "express": "^4.16.4"
+    "sinon": "^7.2.7",
+    "typescript": "^3.3.3333"
   },
   "peerDependencies": {
     "express": "^4.16.4"

src/utils.spec.ts

@@ -0,0 +1,100 @@
+import { Request, Response } from "express";
+import { expect } from "chai";
+import sinon, { SinonStub, SinonSpy } from "sinon";
+
+import {
+  getHeader,
+  setHeader,
+  getRangeHeader,
+  setContentTypeHeader,
+  setContentLengthHeader,
+  setAcceptRangesHeader,
+  setContentDispositionHeader,
+  setContentRangeHeader,
+  setCacheControlHeaderNoCache
+} from "./utils";
+
+describe("utils tests", () => {
+  let req: Request;
+  let res: Response;
+  beforeEach(() => {
+    req = {
+      headers: {
+        "content-type": "application/octet-stream",
+        range: "*"
+      }
+    } as Request;
+    res = {
+      setHeader: sinon.stub() as (name: string, value: string) => void
+    } as Response;
+  });
+  describe("getHeader tests", () => {
+    it("gets the specified header value if present", () => {
+      const value = getHeader("content-type", req);
+      expect(value).to.equal("application/octet-stream");
+    });
+    it("returns undefined if the specified header value is absent", () => {
+      const value = getHeader("mime-type", req);
+      expect(value).to.be.undefined;
+    });
+  });
+  describe("setHeader tests", () => {
+    it("invokes res.setHeader API with the specified name and value args", () => {
+      const name = "Content-Type";
+      const value = "application/octet-stream";
+      setHeader(name, value, res);
+      expect((res.setHeader as SinonStub).calledOnceWith(name, value));
+    });
+  });
+  describe("getRangeHeader tests", () => {
+    it("gets range header value", () => {
+      const value = getRangeHeader(req);
+      expect(value).to.equal("*");
+    });
+  });
+  describe("setContentTypeHeader tests", () => {
+    it("sets Content-Type header with specified value", () => {
+      const value = "application/octet-stream";
+      setContentTypeHeader(value, res);
+      expect((res.setHeader as SinonStub).calledOnceWith("Content-Type", value));
+    });
+  });
+  describe("setContentLengthHeader tests", () => {
+    it("sets Content-Length header with specified value", () => {
+      const value = 100;
+      setContentLengthHeader(value, res);
+      expect((res.setHeader as SinonStub).calledOnceWith("Content-Length", value));
+    });
+  });
+  describe("setAcceptRangesHeader tests", () => {
+    it("sets Accept-Ranges header with specified value", () => {
+      const value = "bytes";
+      setAcceptRangesHeader(res);
+      expect((res.setHeader as SinonStub).calledOnceWith("Accept-Ranges", value));
+    });
+  });
+  describe("setContentRangeHeader tests", () => {
+    it("sets Content-Range header with specified value", () => {
+      const range = { start: 10, end: 100 };
+      const size = 1000;
+      const value = `bytes ${range ? `${range.start}-${range.end}` : "*"}/${size}`;
+      setContentRangeHeader(range, size, res);
+      expect((res.setHeader as SinonStub).calledOnceWith("Content-Range", value));
+    });
+  });
+  describe("setContentDispositionHeader tests", () => {
+    it("sets Content-Disposition header with specified value", () => {
+      const fileName = "file.txt";
+      const value = `attachment; filename="${fileName}"`;
+      setContentDispositionHeader(fileName, res);
+      expect((res.setHeader as SinonStub).calledOnceWith("Content-Disposition", value));
+    });
+  });
+  describe("setCacheControlHeaderNoCache tests", () => {
+    it("sets Cache-Control header with specified value", () => {
+      const value = "no-cache";
+      setCacheControlHeaderNoCache(res);
+      expect((res.setHeader as SinonStub).calledOnceWith("Cache-Control", value));
+    });
+  });
+});

src/utils.ts

@@ -1,8 +1,8 @@
 import { Request, Response } from "express";
 import { Range } from "./Range";
-const getHeader = (name: string, req: Request) => req.headers[name];
+export const getHeader = (name: string, req: Request) => req.headers[name];
 export const getRangeHeader = getHeader.bind(null, "range");
-const setHeader = (name: string, value: string, res: Response) => res.setHeader(name, value);
+export const setHeader = (name: string, value: string, res: Response) => res.setHeader(name, value);
 export const setContentTypeHeader = setHeader.bind(null, "Content-Type");
 export const setContentLengthHeader = setHeader.bind(null, "Content-Length");
 export const setAcceptRangesHeader = setHeader.bind(null, "Accept-Ranges", "bytes");