diff --git a/tests/ops.test.js b/tests/ops.test.js
index 5d8644a1..dd4e08b8 100644
--- a/tests/ops.test.js
+++ b/tests/ops.test.js
@@ -1,5 +1,13 @@
 import { describe, expect, it } from "@jest/globals";
-import { parseBoolean } from "../src/common/ops.js";
+import {
+  parseBoolean,
+  parseArray,
+  clampValue,
+  lowercaseTrim,
+  chunkArray,
+  parseEmojis,
+  dateDiff,
+} from "../src/common/ops.js";
 
 describe("Test ops.js", () => {
   it("should test parseBoolean", () => {
@@ -19,4 +27,63 @@ describe("Test ops.js", () => {
     // @ts-ignore
     expect(parseBoolean(undefined)).toBe(undefined);
   });
+
+  it("should test parseArray", () => {
+    expect(parseArray("a,b,c")).toEqual(["a", "b", "c"]);
+    expect(parseArray("a, b, c")).toEqual(["a", " b", " c"]); // preserves spaces
+    expect(parseArray("")).toEqual([]);
+    // @ts-ignore
+    expect(parseArray(undefined)).toEqual([]);
+  });
+
+  it("should test clampValue", () => {
+    expect(clampValue(5, 1, 10)).toBe(5);
+    expect(clampValue(0, 1, 10)).toBe(1);
+    expect(clampValue(15, 1, 10)).toBe(10);
+
+    // string inputs are coerced numerically by Math.min/Math.max
+    // @ts-ignore
+    expect(clampValue("7", 1, 10)).toBe(7);
+
+    // non-numeric and NaN fall back to min
+    // @ts-ignore
+    expect(clampValue("abc", 1, 10)).toBe(1);
+    expect(clampValue(NaN, 2, 5)).toBe(2);
+  });
+
+  it("should test lowercaseTrim", () => {
+    expect(lowercaseTrim("  Hello World  ")).toBe("hello world");
+    expect(lowercaseTrim("already lower")).toBe("already lower");
+  });
+
+  it("should test chunkArray", () => {
+    expect(chunkArray([1, 2, 3, 4, 5], 2)).toEqual([[1, 2], [3, 4], [5]]);
+    expect(chunkArray([1, 2, 3, 4, 5], 1)).toEqual([[1], [2], [3], [4], [5]]);
+    expect(chunkArray([1, 2, 3, 4, 5], 10)).toEqual([[1, 2, 3, 4, 5]]);
+  });
+
+  it("should test parseEmojis", () => {
+    // unknown emoji name is stripped
+    expect(parseEmojis("Hello :nonexistent:")).toBe("Hello ");
+    // common emoji names should be replaced (at least token removed)
+    const out = parseEmojis("I :heart: OSS");
+    expect(out).not.toContain(":heart:");
+    expect(out.startsWith("I ")).toBe(true);
+    expect(out.endsWith(" OSS")).toBe(true);
+
+    expect(() => parseEmojis("")).toThrow(/parseEmoji/);
+    // @ts-ignore
+    expect(() => parseEmojis()).toThrow(/parseEmoji/);
+  });
+
+  it("should test dateDiff", () => {
+    const a = new Date("2020-01-01T00:10:00Z");
+    const b = new Date("2020-01-01T00:00:00Z");
+    expect(dateDiff(a, b)).toBe(10);
+
+    const c = new Date("2020-01-01T00:00:00Z");
+    const d = new Date("2020-01-01T00:10:30Z");
+    // rounds to nearest minute
+    expect(dateDiff(c, d)).toBe(-10);
+  });
 });