Add tests for utils

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));
+    });
+  });
+});