From 2339a739eccf2ad4ffafefe3923afa5e24ef9da7 Mon Sep 17 00:00:00 2001
From: 7nik <kifiranet@gmail.com>
Date: Thu, 29 Jan 2026 23:00:39 +0200
Subject: [PATCH] chore: allow testing in production env 2 (#17590)

* Revert "chore: allow testing in production env (#16840)"

This reverts commit ffd65e90febc29feaca48e142126a4087fcaca9f.

* new approach
---
 .../samples/production-internals/Child.svelte |  5 ++
 .../samples/production-internals/_config.js   | 12 ++++
 .../samples/production-internals/main.svelte  | 19 ++++++
 .../samples/production/main.svelte            |  0
 .../svelte/tests/runtime-production/test.ts   | 17 +++++
 .../samples/production/_config.js             |  5 --
 packages/svelte/tests/suite.ts                | 66 ++-----------------
 7 files changed, 57 insertions(+), 67 deletions(-)
 create mode 100644 packages/svelte/tests/runtime-production/samples/production-internals/Child.svelte
 create mode 100644 packages/svelte/tests/runtime-production/samples/production-internals/_config.js
 create mode 100644 packages/svelte/tests/runtime-production/samples/production-internals/main.svelte
 rename packages/svelte/tests/{runtime-runes => runtime-production}/samples/production/main.svelte (100%)
 create mode 100644 packages/svelte/tests/runtime-production/test.ts
 delete mode 100644 packages/svelte/tests/runtime-runes/samples/production/_config.js

diff --git a/packages/svelte/tests/runtime-production/samples/production-internals/Child.svelte b/packages/svelte/tests/runtime-production/samples/production-internals/Child.svelte
new file mode 100644
index 0000000000..36b548ab8b
--- /dev/null
+++ b/packages/svelte/tests/runtime-production/samples/production-internals/Child.svelte
@@ -0,0 +1,5 @@
+<script>
+	let { foo = $bindable(42) } = $props();
+</script>
+
+{foo};
diff --git a/packages/svelte/tests/runtime-production/samples/production-internals/_config.js b/packages/svelte/tests/runtime-production/samples/production-internals/_config.js
new file mode 100644
index 0000000000..6ac08f7012
--- /dev/null
+++ b/packages/svelte/tests/runtime-production/samples/production-internals/_config.js
@@ -0,0 +1,12 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	async test({ target }) {
+		let button = target.querySelector('button');
+
+		button?.click();
+
+		flushSync();
+	}
+});
diff --git a/packages/svelte/tests/runtime-production/samples/production-internals/main.svelte b/packages/svelte/tests/runtime-production/samples/production-internals/main.svelte
new file mode 100644
index 0000000000..0629644a01
--- /dev/null
+++ b/packages/svelte/tests/runtime-production/samples/production-internals/main.svelte
@@ -0,0 +1,19 @@
+<script>
+	import Child from "./Child.svelte";
+
+	let foo;
+
+	function onerror(err) {
+		// re-throw if it isn't the production error
+		// do in a such way because config.error is checked via `includes`
+		if (err.message !== 'https://svelte.dev/e/props_invalid_value') {
+			throw err;
+		}
+	}
+</script>
+
+<svelte:boundary {onerror}>
+	<Child bind:foo />
+</svelte:boundary>
+
+
diff --git a/packages/svelte/tests/runtime-runes/samples/production/main.svelte b/packages/svelte/tests/runtime-production/samples/production/main.svelte
similarity index 100%
rename from packages/svelte/tests/runtime-runes/samples/production/main.svelte
rename to packages/svelte/tests/runtime-production/samples/production/main.svelte
diff --git a/packages/svelte/tests/runtime-production/test.ts b/packages/svelte/tests/runtime-production/test.ts
new file mode 100644
index 0000000000..1c9a00ab83
--- /dev/null
+++ b/packages/svelte/tests/runtime-production/test.ts
@@ -0,0 +1,17 @@
+// @vitest-environment jsdom
+
+import { vi } from 'vitest';
+import { runtime_suite, ok } from '../runtime-legacy/shared';
+
+vi.mock('esm-env', async (importEnv) => {
+	return {
+		...(await importEnv()),
+		DEV: false
+	};
+});
+
+const { test, run } = runtime_suite(true);
+
+export { test, ok };
+
+await run(__dirname);
diff --git a/packages/svelte/tests/runtime-runes/samples/production/_config.js b/packages/svelte/tests/runtime-runes/samples/production/_config.js
deleted file mode 100644
index ce36c9d95b..0000000000
--- a/packages/svelte/tests/runtime-runes/samples/production/_config.js
+++ /dev/null
@@ -1,5 +0,0 @@
-import { test } from '../../test';
-
-export default test({
-	production: true
-});
diff --git a/packages/svelte/tests/suite.ts b/packages/svelte/tests/suite.ts
index 72c40f526b..bbd252b8e1 100644
--- a/packages/svelte/tests/suite.ts
+++ b/packages/svelte/tests/suite.ts
@@ -1,11 +1,9 @@
 import fs from 'node:fs';
-import { it, vi } from 'vitest';
+import { it } from 'vitest';
 
 export interface BaseTest {
 	skip?: boolean;
 	solo?: boolean;
-	/** Set `DEV` to `false` */
-	production?: boolean;
 }
 
 /**
@@ -29,31 +27,11 @@ export function suite<Test extends BaseTest>(fn: (config: Test, test_dir: string
 	return {
 		test: (config: Test) => config,
 		run: async (cwd: string, samples_dir = 'samples') => {
-			const production_tests: Array<[Function, string, Function]> = [];
-
 			await for_each_dir<Test>(cwd, samples_dir, (config, dir) => {
 				let it_fn = config.skip ? it.skip : config.solo ? it.only : it;
 
-				if (config.production) {
-					production_tests.push([it_fn, dir, () => fn(config, `${cwd}/${samples_dir}/${dir}`)]);
-				} else {
-					it_fn(dir, () => fn(config, `${cwd}/${samples_dir}/${dir}`));
-				}
+				it_fn(dir, () => fn(config, `${cwd}/${samples_dir}/${dir}`));
 			});
-
-			let mocked = false;
-			for (const [it, name, test] of production_tests) {
-				it(name, () => {
-					if (!mocked) {
-						vi.doMock('esm-env', async (importEnv) => ({
-							...(await importEnv()),
-							DEV: false
-						}));
-						mocked = true;
-					}
-					return test();
-				});
-			}
 		}
 	};
 }
@@ -67,8 +45,6 @@ export function suite_with_variants<Test extends BaseTest, Variants extends stri
 	return {
 		test: (config: Test) => config,
 		run: async (cwd: string, samples_dir = 'samples') => {
-			const production_tests: Array<[Function, string, Function]> = [];
-
 			await for_each_dir<Test>(cwd, samples_dir, (config, dir) => {
 				let called_common = false;
 				let common: any = undefined;
@@ -81,35 +57,15 @@ export function suite_with_variants<Test extends BaseTest, Variants extends stri
 					const solo = config.solo;
 					let it_fn = skip ? it.skip : solo ? it.only : it;
 
-					const test = async () => {
+					it_fn(`${dir} (${variant})`, async () => {
 						if (!called_common) {
 							called_common = true;
 							common = await common_setup(config, `${cwd}/${samples_dir}/${dir}`);
 						}
 						return fn(config, `${cwd}/${samples_dir}/${dir}`, variant, common);
-					};
-
-					if (config.production) {
-						production_tests.push([it_fn, `${dir} (${variant})`, test]);
-					} else {
-						it_fn(`${dir} (${variant})`, test);
-					}
+					});
 				}
 			});
-
-			let mocked = false;
-			for (const [it, name, test] of production_tests) {
-				it(name, () => {
-					if (!mocked) {
-						vi.doMock('esm-env', async (importEnv) => ({
-							...(await importEnv()),
-							DEV: false
-						}));
-						mocked = true;
-					}
-					return test();
-				});
-			}
 		}
 	};
 }
@@ -152,17 +108,3 @@ export function assert_ok(value: any): asserts value {
 		throw new Error(`Expected truthy value, got ${value}`);
 	}
 }
-
-function run_in_production(fn: (...args: any[]) => void | Promise<void>) {
-	return async (...args: any[]) => {
-		vi.doMock('esm-env', async (importEnv) => ({
-			...(await importEnv()),
-			DEV: false
-		}));
-		try {
-			await fn(...args);
-		} finally {
-			vi.doUnmock('esm-env');
-		}
-	};
-}