Make tests and implementation interact.

spec/support/ds4rolls.spec.ts

@@ -0,0 +1,19 @@
+import {
+    rollCheckSingleDie,
+    RollOptions,
+    RollProvider,
+    RollResult,
+    RollResultStatus,
+} from "../../src/module/rolls/ds4rolls";
+
+describe("DS4 Rolls", () => {
+    it("Should do a proper single success role", () => {
+        const rollProvider: RollProvider = jasmine.createSpyObj("rollProvider", ["getNextRoll"]);
+
+        rollProvider.getNextRoll = jasmine.createSpy("getNextRoll").and.returnValue(4);
+
+        expect(rollCheckSingleDie(12, new RollOptions(), rollProvider)).toEqual(
+            new RollResult(4, RollResultStatus.SUCCESS, [4]),
+        );
+    });
+});