diff --git a/packages/core/src/virtual-test-support-styles.ts b/packages/core/src/virtual-test-support-styles.ts
index 240aeaf67..0afd88b16 100644
--- a/packages/core/src/virtual-test-support-styles.ts
+++ b/packages/core/src/virtual-test-support-styles.ts
@@ -1,4 +1,9 @@
 import type { Package } from '@embroider/shared-internals';
+import type { V2AddonPackage } from '@embroider/shared-internals/src/package';
+import { readFileSync } from 'fs';
+import { sortBy } from 'lodash';
+import resolve from 'resolve';
+import type { Engine } from './app-files';
 import type { Resolver } from './module-resolver';
 import type { VirtualContentResult } from './virtual-content';
 
@@ -15,7 +20,51 @@ export function renderTestSupportStyles(filename: string, resolver: Resolver): V
 }
 
 function getTestSupportStyles(owner: Package, resolver: Resolver): string {
-  console.log(owner);
-  console.log(resolver);
-  return `h1 { color: white; }`;
+  let engineConfig = resolver.owningEngine(owner);
+  let engine: Engine = {
+    package: owner,
+    addons: new Map(
+      engineConfig.activeAddons.map(addon => [
+        resolver.packageCache.get(addon.root) as V2AddonPackage,
+        addon.canResolveFromFile,
+      ])
+    ),
+    isApp: true,
+    modulePrefix: resolver.options.modulePrefix,
+    appRelativePath: 'NOT_USED_DELETE_ME',
+  };
+
+  return generateTestSupportStyles(engine);
+}
+
+function generateTestSupportStyles(engine: Engine): string {
+  let result: string[] = impliedAddonTestSupportStyles(engine).map((sourcePath: string): string => {
+    let source = readFileSync(sourcePath);
+    return `${source}`;
+  });
+
+  return result.join('') as string;
+}
+
+function impliedAddonTestSupportStyles(engine: Engine): string[] {
+  let result: Array<string> = [];
+  for (let addon of sortBy(Array.from(engine.addons.keys()), pkg => {
+    switch (pkg.name) {
+      case 'loader.js':
+        return 0;
+      case 'ember-source':
+        return 10;
+      default:
+        return 1000;
+    }
+  })) {
+    let implicitStyles = addon.meta['implicit-test-styles'];
+    if (implicitStyles) {
+      let options = { basedir: addon.root };
+      for (let mod of implicitStyles) {
+        result.push(resolve.sync(mod, options));
+      }
+    }
+  }
+  return result;
 }