refactor(agents): dedupe plugin hooks and test helpers

src/test-utils/env.ts

@@ -17,6 +17,16 @@ export function captureEnv(keys: string[]) {
   };
 }
 
+function applyEnvValues(env: Record<string, string | undefined>): void {
+  for (const [key, value] of Object.entries(env)) {
+    if (value === undefined) {
+      delete process.env[key];
+    } else {
+      process.env[key] = value;
+    }
+  }
+}
+
 export function captureFullEnv() {
   const snapshot: Record<string, string | undefined> = { ...process.env };
 
@@ -41,13 +51,7 @@ export function captureFullEnv() {
 export function withEnv<T>(env: Record<string, string | undefined>, fn: () => T): T {
   const snapshot = captureEnv(Object.keys(env));
   try {
-    for (const [key, value] of Object.entries(env)) {
-      if (value === undefined) {
-        delete process.env[key];
-      } else {
-        process.env[key] = value;
-      }
-    }
+    applyEnvValues(env);
     return fn();
   } finally {
     snapshot.restore();
@@ -60,13 +64,7 @@ export async function withEnvAsync<T>(
 ): Promise<T> {
   const snapshot = captureEnv(Object.keys(env));
   try {
-    for (const [key, value] of Object.entries(env)) {
-      if (value === undefined) {
-        delete process.env[key];
-      } else {
-        process.env[key] = value;
-      }
-    }
+    applyEnvValues(env);
     return await fn();
   } finally {
     snapshot.restore();