fix: Add Plugin Mocks to Provider Tests (#8276)

packages/opencode/test/provider/provider.test.ts

@@ -1,5 +1,27 @@
-import { test, expect } from "bun:test"
+import { test, expect, mock } from "bun:test"
 import path from "path"
+
+// Mock BunProc and default plugins to prevent actual installations during tests
+mock.module("../../src/bun/index", () => ({
+  BunProc: {
+    install: async (pkg: string, _version?: string) => {
+      // Return package name without version for mocking
+      const lastAtIndex = pkg.lastIndexOf("@")
+      return lastAtIndex > 0 ? pkg.substring(0, lastAtIndex) : pkg
+    },
+    run: async () => {
+      throw new Error("BunProc.run should not be called in tests")
+    },
+    which: () => process.execPath,
+    InstallFailedError: class extends Error {},
+  },
+}))
+
+const mockPlugin = () => ({})
+mock.module("opencode-copilot-auth", () => ({ default: mockPlugin }))
+mock.module("opencode-anthropic-auth", () => ({ default: mockPlugin }))
+mock.module("@gitlab/opencode-gitlab-auth", () => ({ default: mockPlugin }))
+
 import { tmpdir } from "../fixture/fixture"
 import { Instance } from "../../src/project/instance"
 import { Provider } from "../../src/provider/provider"