diff --git a/test/fixtures/css/package.json b/test/fixtures/css/package.json
index 86ed1e3e..dcc579ec 100644
--- a/test/fixtures/css/package.json
+++ b/test/fixtures/css/package.json
@@ -17,6 +17,15 @@
           "src": "src/style.css",
           "dest": "dist/",
           "concat": "style.css"
+        },
+        {
+          "handler": "css",
+          "src": [
+            "node_modules/bootstrap/dist/css/bootstrap-reboot.css",
+            "node_modules/bootstrap/dist/css/bootstrap-grid.css"
+          ],
+          "dest": "dist/",
+          "concat": "bootstrap-reboot-and-grid.css"
         }
       ]
     }
diff --git a/test/functional/api/commands/build.test.ts b/test/functional/api/commands/build.test.ts
index a27f4a72..43a77af0 100644
--- a/test/functional/api/commands/build.test.ts
+++ b/test/functional/api/commands/build.test.ts
@@ -234,11 +234,14 @@ describe('command: build', () => {
       expect(api.logger.info).toHaveBeenCalledWith('sass :: finished bundling "bootstrap-grid.css"');
       expect(api.logger.info).toHaveBeenCalledWith('css :: start bundling "style.css"');
       expect(api.logger.info).toHaveBeenCalledWith('css :: finished bundling "style.css"');
+      expect(api.logger.info).toHaveBeenCalledWith('css :: start bundling "bootstrap-reboot-and-grid.css"');
+      expect(api.logger.info).toHaveBeenCalledWith('css :: finished bundling "bootstrap-reboot-and-grid.css"');
 
       expect(await readFile('src/bootstrap-grid.scss')).toMatchSnapshot('bootstrap-grid.scss after linting');
       expect(await readFile('src/style.css')).toMatchSnapshot('style.css after linting');
       expect(await fileExists('dist/bootstrap-grid.css')).toBeTruthy();
       expect(await fileExists('dist/style.css')).toBeTruthy();
+      expect(await fileExists('dist/bootstrap-reboot-and-grid.css')).toBeTruthy();
 
       await cleanup();
     }, 30000);