test: update test

__tests__/getMean.test.js

@@ -1,12 +1,44 @@
 import getMean from "../src/lib/getMean";
 import { FAKE_SESSION } from "../data/FAKE_SESSION";
 
-test("Should get the mean from an array of solves", () => {
-  expect(getMean([])).toBe(0);
-  expect(getMean([...FAKE_SESSION])).toBe(13658.98076923077);
-  expect(getMean([...FAKE_SESSION].slice(0, 5))).toBe(13861.6);
-  expect(getMean([...FAKE_SESSION].slice(5, 12))).toBe(15207.42857142857);
-  expect(getMean([...FAKE_SESSION].slice(0, 12))).toBe(14646.666666666666);
-  expect(getMean([...FAKE_SESSION].slice(0, 50))).toBe(13738.22);
-  expect(getMean()).toBe(0);
+describe("Should get the mean from an array of solves", () => {
+  test("Empty array", () => {
+    expect(getMean([])).toBe(0);
+  });
+
+  test("Full session, undetermined range of values", () => {
+    expect(getMean([...FAKE_SESSION])).toBe(13658.98076923077);
+  });
+
+  test("Session, 5 values", () => {
+    expect(getMean([...FAKE_SESSION].slice(0, 5))).toBe(13861.6);
+  });
+
+  test("Session, 12 values", () => {
+    expect(getMean([...FAKE_SESSION].slice(0, 12))).toBe(14646.666666666666);
+  });
+
+  test("Session, 50 values", () => {
+    expect(getMean([...FAKE_SESSION].slice(0, 50))).toBe(13738.22);
+  });
+
+  test("Empty usage of the function", () => {
+    expect(getMean()).toBe(0);
+  });
+
+  test("Passing a string as parameter", () => {
+    expect(getMean("string")).toBe(0);
+  });
+
+  test("Passing a number as parameter", () => {
+    expect(getMean(123)).toBe(0);
+  });
+
+  test("Passing a null as parameter", () => {
+    expect(getMean(null)).toBe(0);
+  });
+
+  test("Passing a undefined as parameter", () => {
+    expect(getMean(undefined)).toBe(0);
+  });
 });

src/lib/getMean.ts

@@ -6,7 +6,10 @@ import { Solve } from "@/interfaces/Solve";
  * @returns {number} The mean of solve times. Returns 0 if there are no solves.
  */
 export default function getMean(solves: Solve[]): number {
-  if (!solves) return 0;
+  if (!solves || typeof solves === "string" || typeof solves === "number") {
+    return 0;
+  }
+
   const n = solves.length;
 
   // If there are no solves, the mean is 0.