Switch to jest

spec/rolls/roll-utils.spec.ts

@@ -0,0 +1,23 @@
+import { isDiceSwapNecessary } from "../../src/module/rolls/roll-utils";
+
+describe("Utility function testing if dice swap is necessary", () => {
+    it("Should not swap if all dice are crit successes.", () => {
+        expect(isDiceSwapNecessary([[1, 1, 1], []], 9)).toBeFalsy();
+    });
+
+    it("Should not swap if no die is crit success.", () => {
+        expect(isDiceSwapNecessary([[], [2, 2, 2]], 9)).toBeFalsy();
+    });
+
+    it("Should not swap if all dice are already in use", () => {
+        expect(isDiceSwapNecessary([[1], [9, 8]], 10)).toBeFalsy();
+    });
+
+    it("Should not swap if result does not get any better", () => {
+        expect(isDiceSwapNecessary([[1], [8]], 4)).toBeFalsy();
+    });
+
+    it("Should swap if result does get better", () => {
+        expect(isDiceSwapNecessary([[1], [19]], 18)).toBeTruthy();
+    });
+});