feat: scaffold OpenCode V2 toolkit with safe project installer

test/installer-config.test.js

@@ -0,0 +1,42 @@
+import assert from "node:assert/strict"
+import test from "node:test"
+import { addPlugin, removePlugin } from "../dist/installer/config.js"
+
+const pluginName = "@sargatxet/opencode-toolkit"
+
+test("adds a package plugin while preserving unrelated JSONC and comments", () => {
+  const original = `{
+  // Keep the user's settings intact.
+  "model": "provider/model",
+  "plugins": ["existing-plugin"]
+}`
+
+  const result = addPlugin(original, pluginName)
+  const parsed = JSON.parse(result.content.replace("// Keep the user's settings intact.\n  ", ""))
+
+  assert.equal(result.added, true)
+  assert.equal(parsed.model, "provider/model")
+  assert.deepEqual(parsed.plugins, ["existing-plugin", pluginName])
+  assert.match(result.content, /Keep the user's settings intact/)
+})
+
+test("does not duplicate an already configured package plugin", () => {
+  const original = JSON.stringify({ plugins: [pluginName] }, null, 2)
+  const result = addPlugin(original, pluginName)
+
+  assert.equal(result.added, false)
+  assert.equal(result.content, original)
+})
+
+test("removes only the requested package plugin", () => {
+  const original = JSON.stringify({ plugins: ["other-plugin", pluginName] }, null, 2)
+  const result = removePlugin(original, pluginName)
+
+  assert.equal(result.removed, true)
+  assert.deepEqual(JSON.parse(result.content).plugins, ["other-plugin"])
+})
+
+test("rejects malformed or incompatible plugin configuration", () => {
+  assert.throws(() => addPlugin('{ "plugins": "not-an-array" }', pluginName), /plugins.*array/i)
+  assert.throws(() => addPlugin('{ broken', pluginName), /invalid JSONC/i)
+})