fix: test mode force isServer=true (#4056)

fixed #4034

Author: manucorporat

packages/qwik/src/optimizer/src/plugins/plugin.ts

@@ -481,7 +481,7 @@ export function createPlugin(optimizerOptions: OptimizerOptions = {}) {
       log(`load()`, QWIK_BUILD_ID, opts.buildMode);
       return {
         moduleSideEffects: false,
-        code: getQwikBuildModule(loadOpts),
+        code: getQwikBuildModule(loadOpts, opts.target),
       };
     }
 
@@ -749,8 +749,8 @@ export function createPlugin(optimizerOptions: OptimizerOptions = {}) {
     return id;
   };
 
-  function getQwikBuildModule(loadOpts: { ssr?: boolean }) {
-    const isServer = !!loadOpts.ssr;
+  function getQwikBuildModule(loadOpts: { ssr?: boolean }, target: QwikBuildTarget) {
+    const isServer = !!loadOpts.ssr || target === 'test';
     const isDev = opts.buildMode === 'development';
     return `// @builder.io/qwik/build
 export const isServer = ${JSON.stringify(isServer)};