diff --git a/lazy/test_underscore.py b/lazy/test_underscore.py
index 3e3969d..5a75e60 100644
--- a/lazy/test_underscore.py
+++ b/lazy/test_underscore.py
@@ -1,4 +1,4 @@
-from .lazy import _, F
+from .lazy import dsl
 
 
 def test_underscore_calculate():
@@ -30,20 +30,20 @@ def test_underscore_with_functions():
     def add(x, y):
         return x + y
 
-    f = F(str)(_ + 3)
+    f = str(_ + 3)
     assert f(2) == "5"
 
-    f = F(add)(_, 3)
+    f = add(_, 3)
     assert f(2) == 5
 
-    f = F(add)(x=_, y=3)
+    f = add(x=_, y=3)
     assert f(2) == 5
 
-    f = F(add)(_, y=3)
+    f = add(_, y=3)
     assert f(2) == 5
 
-    assert list(map(F(str)(_ * 2), [1, 2, 3])) == ['2', '4', '6']
-    assert list(map(F(str)(_ * _), [1, 2, 3])) == ['1', '4', '9']
-    assert list(map(F(add)(1, _ * 2), [1, 2, 3])) == [3, 5, 7]
-    assert list(map(F(add)(_ * 2, 4), [1, 2, 3])) == [6, 8, 10]
-    assert list(map(F(add)(_ * 3, _ + 2), [1, 2, 3])) == [6, 10, 14]
+    assert list(map(str(_ * 2), [1, 2, 3])) == ['2', '4', '6']
+    assert list(map(str(_ * _), [1, 2, 3])) == ['1', '4', '9']
+    assert list(map(add(1, _ * 2), [1, 2, 3])) == [3, 5, 7]
+    assert list(map(add(_ * 2, 4), [1, 2, 3])) == [6, 8, 10]
+    assert list(map(add(_ * 3, _ + 2), [1, 2, 3])) == [6, 10, 14]