build: remember last models

tests/utils.test.ts

@@ -7,6 +7,7 @@ import {
   spyOn,
   test,
 } from "bun:test";
+import * as fs from "node:fs";
 import * as os from "node:os";
 import {
   createWindowBaseName,
@@ -15,13 +16,16 @@ import {
   formatInvalidModelError,
   getBinaryName,
   getSessionPath,
+  getSettingsPath,
   getWorktreePath,
   getWorktreesForSession,
   launchModelInWindow,
   levenshtein,
+  loadSettings,
   normalizeModels,
   runCommand,
   sanitizeName,
+  saveSettings,
   shellQuote,
   suggestModels,
   undoWorktree,
@@ -484,4 +488,86 @@ describe("core utils", () => {
       delete process.env.OPENCODE_MULTI_MODEL_BINARY;
     });
   });
+
+  describe("getSettingsPath", () => {
+    test("returns correct settings path", () => {
+      spyOn(os, "homedir").mockReturnValue("/home/user");
+      expect(getSettingsPath()).toBe(
+        "/home/user/.config/opencode-multi-model/settings.json",
+      );
+    });
+  });
+
+  describe("loadSettings", () => {
+    let readFileMock: ReturnType<typeof spyOn>;
+
+    beforeEach(() => {
+      spyOn(os, "homedir").mockReturnValue("/home/user");
+      readFileMock = spyOn(fs.promises, "readFile");
+    });
+
+    test("returns default settings when file does not exist", async () => {
+      readFileMock.mockRejectedValue(new Error("ENOENT"));
+      const result = await loadSettings();
+      expect(result).toEqual({ lastModels: [] });
+    });
+
+    test("returns default settings when file has invalid JSON", async () => {
+      readFileMock.mockResolvedValue("not valid json");
+      const result = await loadSettings();
+      expect(result).toEqual({ lastModels: [] });
+    });
+
+    test("returns default settings when lastModels is not an array", async () => {
+      readFileMock.mockResolvedValue(
+        JSON.stringify({ lastModels: "not array" }),
+      );
+      const result = await loadSettings();
+      expect(result).toEqual({ lastModels: [] });
+    });
+
+    test("parses valid settings file", async () => {
+      readFileMock.mockResolvedValue(
+        JSON.stringify({ lastModels: ["model1", "model2"] }),
+      );
+      const result = await loadSettings();
+      expect(result).toEqual({ lastModels: ["model1", "model2"] });
+    });
+  });
+
+  describe("saveSettings", () => {
+    let mkdirMock: ReturnType<typeof spyOn>;
+    let writeFileMock: ReturnType<typeof spyOn>;
+
+    beforeEach(() => {
+      spyOn(os, "homedir").mockReturnValue("/home/user");
+      mkdirMock = spyOn(fs.promises, "mkdir");
+      writeFileMock = spyOn(fs.promises, "writeFile");
+    });
+
+    test("creates directory if it does not exist", async () => {
+      mkdirMock.mockResolvedValue(undefined);
+      writeFileMock.mockResolvedValue(undefined);
+
+      await saveSettings({ lastModels: ["model1"] });
+
+      expect(mkdirMock).toHaveBeenCalledWith(
+        "/home/user/.config/opencode-multi-model",
+        { recursive: true },
+      );
+    });
+
+    test("writes settings with correct content", async () => {
+      mkdirMock.mockResolvedValue(undefined);
+      writeFileMock.mockResolvedValue(undefined);
+
+      await saveSettings({ lastModels: ["model1", "model2"] });
+
+      expect(writeFileMock).toHaveBeenCalledWith(
+        "/home/user/.config/opencode-multi-model/settings.json",
+        JSON.stringify({ lastModels: ["model1", "model2"] }, null, 2),
+        "utf-8",
+      );
+    });
+  });
 });