chore: 补充单元测试

packages/core/basic/src/utils/util.string.test.ts

@@ -0,0 +1,36 @@
+/// <reference types="mocha" />
+
+import { expect } from "chai";
+
+import { stringUtils } from "./util.string.js";
+
+describe("stringUtils", () => {
+  describe("maxLength", () => {
+    it("returns an empty string for empty input", () => {
+      expect(stringUtils.maxLength()).to.equal("");
+      expect(stringUtils.maxLength("")).to.equal("");
+    });
+
+    it("returns the original string when it is within the limit", () => {
+      expect(stringUtils.maxLength("certd", 5)).to.equal("certd");
+      expect(stringUtils.maxLength("certd", 6)).to.equal("certd");
+    });
+
+    it("truncates strings longer than the limit and appends ellipsis", () => {
+      expect(stringUtils.maxLength("certificate", 4)).to.equal("cert...");
+    });
+  });
+
+  describe("appendTimeSuffix", () => {
+    it("returns an empty string for empty input", () => {
+      expect(stringUtils.appendTimeSuffix()).to.equal("");
+      expect(stringUtils.appendTimeSuffix("")).to.equal("");
+    });
+
+    it("appends a millisecond timestamp suffix", () => {
+      const result = stringUtils.appendTimeSuffix("certd");
+
+      expect(result).to.match(/^certd-\d{17}$/);
+    });
+  });
+});