feat: add tests for constants

test/constants.test.ts

@@ -0,0 +1,58 @@
+// Note: we need to import logger from the root
+// because this is the logger used in logError in ../src/common/util
+import { logger } from "../node_modules/@coder/logger"
+import { commit, getPackageJson, version } from "../src/node/constants"
+
+describe("constants", () => {
+  describe("getPackageJson", () => {
+    let spy: jest.SpyInstance
+
+    beforeEach(() => {
+      spy = jest.spyOn(logger, "warn")
+    })
+
+    afterEach(() => {
+      jest.clearAllMocks()
+    })
+
+    afterAll(() => {
+      jest.restoreAllMocks()
+    })
+
+    it("should log a warning if package.json not found", () => {
+      const expectedErrorMessage = "Cannot find module './package.json' from 'src/node/constants.ts'"
+
+      getPackageJson("./package.json")
+
+      expect(spy).toHaveBeenCalled()
+      expect(spy).toHaveBeenCalledWith(expectedErrorMessage)
+    })
+
+    it("should find the package.json", () => {
+      // the function calls require from src/node/constants
+      // so to get the root package.json we need to use ../../
+      const packageJson = getPackageJson("../../package.json")
+      expect(Object.keys(packageJson).length).toBeGreaterThan(0)
+      expect(packageJson.name).toBe("code-server")
+      expect(packageJson.description).toBe("Run VS Code on a remote server.")
+      expect(packageJson.repository).toBe("https://github.com/cdr/code-server")
+    })
+  })
+  describe("version", () => {
+    it("should return the package.json version", () => {
+      // Source: https://gist.github.com/jhorsman/62eeea161a13b80e39f5249281e17c39#gistcomment-2896416
+      const validSemVar = new RegExp("^(0|[1-9]d*).(0|[1-9]d*).(0|[1-9]d*)")
+      const isValidSemVar = validSemVar.test(version)
+      expect(version).not.toBe(null)
+      expect(isValidSemVar).toBe(true)
+    })
+  })
+
+  describe("commit", () => {
+    it("should return 'development' if commit is undefined", () => {
+      // In development, the commit is not stored in our package.json
+      // But when we build code-server and release it, it is
+      expect(commit).toBe("development")
+    })
+  })
+})