Secret handshake

typescript/secret-handshake/secret-handshake.test.ts

@@ -0,0 +1,59 @@
+import { commands } from "./secret-handshake";
+
+describe("Secret Handshake", () => {
+  describe("Create A Handshake For A Number", () => {
+    it("wink for 1", () => {
+      expect(commands(1)).toEqual(["wink"]);
+    });
+
+    it("double blink for 10", () => {
+      expect(commands(2)).toEqual(["double blink"]);
+    });
+
+    it("close your eyes for 100", () => {
+      expect(commands(4)).toEqual(["close your eyes"]);
+    });
+
+    it("jump for 1000", () => {
+      expect(commands(8)).toEqual(["jump"]);
+    });
+
+    it("combine two actions", () => {
+      expect(commands(3)).toEqual(["wink", "double blink"]);
+    });
+
+    it("reverse two actions", () => {
+      expect(commands(19)).toEqual(["double blink", "wink"]);
+    });
+
+    it("reversing one action gives the same action", () => {
+      expect(commands(24)).toEqual(["jump"]);
+    });
+
+    it("reversing no actions still gives no actions", () => {
+      expect(commands(16)).toEqual([]);
+    });
+
+    it("all possible actions", () => {
+      expect(commands(15)).toEqual([
+        "wink",
+        "double blink",
+        "close your eyes",
+        "jump",
+      ]);
+    });
+
+    it("reverse all possible actions", () => {
+      expect(commands(31)).toEqual([
+        "jump",
+        "close your eyes",
+        "double blink",
+        "wink",
+      ]);
+    });
+
+    it("do nothing for zero", () => {
+      expect(commands(0 as 1)).toEqual([]);
+    });
+  });
+});