test: migrate remaining simple config fixtures

packages/opencode/test/config/config.test.ts

@@ -157,16 +157,12 @@ async function check(map: (dir: string) => string) {
   }
 }
 
-test("loads config with defaults when no files exist", async () => {
-  await using tmp = await tmpdir()
-  await withTestInstance({
-    directory: tmp.path,
-    fn: async (ctx) => {
-      const config = await load(ctx)
-      expect(config.username).toBeDefined()
-    },
-  })
-})
+it.instance("loads config with defaults when no files exist", () =>
+  Effect.gen(function* () {
+    const config = yield* Config.Service.use((svc) => svc.get())
+    expect(config.username).toBeDefined()
+  }),
+)
 
 test("creates global jsonc config with schema when no global configs exist", async () => {
   await using tmp = await tmpdir()
@@ -346,27 +342,22 @@ test("loads project config from Cygwin paths on Windows", async () => {
   })
 })
 
-test("ignores legacy tui keys in opencode config", async () => {
-  await using tmp = await tmpdir({
-    init: async (dir) => {
-      await writeConfig(dir, {
-        $schema: "https://opencode.ai/config.json",
-        model: "test/model",
-        theme: "legacy",
-        tui: { scroll_speed: 4 },
-      })
-    },
-  })
-  await withTestInstance({
-    directory: tmp.path,
-    fn: async (ctx) => {
-      const config = await load(ctx)
-      expect(config.model).toBe("test/model")
-      expect((config as Record<string, unknown>).theme).toBeUndefined()
-      expect((config as Record<string, unknown>).tui).toBeUndefined()
-    },
-  })
-})
+it.instance("ignores legacy tui keys in opencode config", () =>
+  Effect.gen(function* () {
+    const test = yield* TestInstance
+    yield* writeConfigEffect(test.directory, {
+      $schema: "https://opencode.ai/config.json",
+      model: "test/model",
+      theme: "legacy",
+      tui: { scroll_speed: 4 },
+    })
+
+    const config = yield* Config.Service.use((svc) => svc.get())
+    expect(config.model).toBe("test/model")
+    expect((config as Record<string, unknown>).theme).toBeUndefined()
+    expect((config as Record<string, unknown>).tui).toBeUndefined()
+  }),
+)
 
 it.instance("loads JSONC config file", () =>
   Effect.gen(function* () {