diff --git a/src/actdiag/tests/test_generate_diagram.py b/src/actdiag/tests/test_generate_diagram.py
index c5ee3d5..a74a151 100644
--- a/src/actdiag/tests/test_generate_diagram.py
+++ b/src/actdiag/tests/test_generate_diagram.py
@@ -16,16 +16,6 @@
 import os
 
 from blockdiag.tests.test_generate_diagram import (get_diagram_files,
-                                                   testcase_generator)
+                                                   test_generate_with_separate)
 
-import actdiag.command
 
-
-def test_generate():
-    mainfunc = actdiag.command.main
-    basepath = os.path.dirname(__file__)
-    files = get_diagram_files(basepath)
-    options = []
-
-    for testcase in testcase_generator(basepath, mainfunc, files, options):
-        yield testcase