test: add unit tests for the Messages class (#9)

* test: add test for the Messages class

* 1.3.0

package.json

@@ -1,6 +1,6 @@
 {
   "name": "error-pages",
-  "version": "1.2.1",
+  "version": "1.3.0",
   "description": "Lightweight tool to create static HTTP Error Pages in minimalistic adaptive and accessible design with customization and localization support",
   "main": "index.ts",
   "scripts": {

test/Messages.spec.ts

@@ -0,0 +1,32 @@
+import { assert } from "chai";
+import { Messages } from "../lib/classes/Messages";
+
+describe("class Messages", () => {
+  const key = "test";
+  const vars = {
+    [key]: "TEST",
+  };
+  const noVarsMsg = "no vars";
+  const withVarsMsg = "with var";
+
+  const methods = new Map<string, string>([
+    ["error", "ERROR: "],
+    ["info", "INFO: "],
+    ["list", " • "],
+    ["skip", "  SKIP: "],
+    ["text", ""],
+    ["warn", "WARN: "],
+  ]);
+
+  methods.forEach((prefix: string, method: string) => {
+    describe(`${method}()`, () => {
+      it("should be rendered to formatted string without variables", () => {
+        assert.equal(Messages[method](noVarsMsg), `${prefix}${noVarsMsg}`);
+      });
+
+      it("should be rendered to formatted string with variables", () => {
+        assert.equal(Messages[method](`${withVarsMsg} {{ ${key} }}`, vars), `${prefix}${withVarsMsg} ${vars[key]}`);
+      });
+    });
+  });
+});