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xterminal/tests/history.test.ts

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+import { describe, it, expect, beforeEach } from "vitest";
+import XHistory from "../source/history/index";
+
+describe("XHistory", () => {
+    let history: XHistory;
+
+    beforeEach(() => {
+        history = new XHistory();
+    });
+
+    describe("constructor", () => {
+        it("should create with empty array", () => {
+            expect(history.list).toEqual([]);
+        });
+
+        it("should create with initial state", () => {
+            const h = new XHistory(["cmd1", "cmd2"]);
+            expect(h.list).toEqual(["cmd2", "cmd1"]); // reversed
+        });
+    });
+
+    describe("add", () => {
+        it("should add new entry", () => {
+            history.add("cmd1");
+            expect(history.list).toEqual(["cmd1"]);
+        });
+
+        it("should not add duplicate consecutive entries", () => {
+            history.add("cmd1");
+            history.add("cmd1");
+            expect(history.list).toEqual(["cmd1"]);
+        });
+
+        it("should add different entries", () => {
+            history.add("cmd1");
+            history.add("cmd2");
+            expect(history.list).toEqual(["cmd1", "cmd2"]);
+        });
+
+        it("should not add empty string", () => {
+            history.add("");
+            expect(history.list).toEqual([]);
+        });
+    });
+
+    describe("previous and next", () => {
+        beforeEach(() => {
+            history.add("cmd1");
+            history.add("cmd2");
+            history.add("cmd3");
+        });
+
+        it("should navigate previous", () => {
+            expect(history.previous()).toBe("cmd3");
+            expect(history.previous()).toBe("cmd2");
+            expect(history.previous()).toBe("cmd1");
+            expect(history.previous()).toBe("cmd1"); // stays at last
+        });
+
+        it("should navigate next", () => {
+            history.previous(); // cmd3
+            history.previous(); // cmd2
+            expect(history.next()).toBe("cmd3");
+            expect(history.next()).toBe("");
+        });
+    });
+
+    describe("clear", () => {
+        it("should clear all entries", () => {
+            history.add("cmd1");
+            history.clear();
+            expect(history.list).toEqual([]);
+        });
+    });
+});