diff --git a/tests/test_integration_/test_cli._py_ b/tests/test_integration_/test_cli._py_
index 6ec3a75..8e47018 100644
--- a/tests/test_integration_/test_cli._py_
+++ b/tests/test_integration_/test_cli._py_
@@ -8,3 +8,4 @@ class F:
 
 
 print("hello world")
+assert t.uname == "\udce4\udcf6\udcfc"
diff --git a/tests/test_integration_/test_cli.yml b/tests/test_integration_/test_cli.yml
index 8241324..92f2812 100644
--- a/tests/test_integration_/test_cli.yml
+++ b/tests/test_integration_/test_cli.yml
@@ -4,7 +4,7 @@ out:
 - Reformatting code.py
 - "--- code.py\t(original)"
 - "+++ code.py\t(reformatted)"
-- '@@ -1,11 +1,11 @@'
+- '@@ -1,12 +1,12 @@'
 - ' class F:'
 - "-\tfrom collections import ("
 - -Iterable,
@@ -18,8 +18,10 @@ out:
 - " \t\tpass"
 - ''
 - -print('hello world')
+- -assert t.uname == '\udce4\udcf6\udcfc'
 - ''
 - +print("hello world")
+- +assert t.uname == "\udce4\udcf6\udcfc"
 - +
 - ''
 - ''
diff --git a/tests/test_integration_/test_cli_verbose_verbose._py_ b/tests/test_integration_/test_cli_verbose_verbose._py_
index 6ec3a75..8e47018 100644
--- a/tests/test_integration_/test_cli_verbose_verbose._py_
+++ b/tests/test_integration_/test_cli_verbose_verbose._py_
@@ -8,3 +8,4 @@ class F:
 
 
 print("hello world")
+assert t.uname == "\udce4\udcf6\udcfc"
diff --git a/tests/test_integration_/test_integration._py_ b/tests/test_integration_/test_integration._py_
index 6ec3a75..8e47018 100644
--- a/tests/test_integration_/test_integration._py_
+++ b/tests/test_integration_/test_integration._py_
@@ -8,3 +8,4 @@ class F:
 
 
 print("hello world")
+assert t.uname == "\udce4\udcf6\udcfc"
diff --git a/tests/test_integration_/test_integration.yml b/tests/test_integration_/test_integration.yml
index 0644bac..c1e8091 100644
--- a/tests/test_integration_/test_integration.yml
+++ b/tests/test_integration_/test_integration.yml
@@ -3,7 +3,7 @@ err:
 out:
 - "--- .../test_integration0/code.py\t(original)"
 - "+++ .../test_integration0/code.py\t(reformatted)"
-- '@@ -1,11 +1,11 @@'
+- '@@ -1,12 +1,12 @@'
 - ' class F:'
 - "-\tfrom collections import ("
 - -Iterable,
@@ -17,8 +17,10 @@ out:
 - " \t\tpass"
 - ''
 - -print('hello world')
+- -assert t.uname == '\udce4\udcf6\udcfc'
 - ''
 - +print("hello world")
+- +assert t.uname == "\udce4\udcf6\udcfc"
 - +
 - ''
 - ''
diff --git a/tests/test_integration_/test_integration_pyproject._py_ b/tests/test_integration_/test_integration_pyproject._py_
index 6ec3a75..8e47018 100644
--- a/tests/test_integration_/test_integration_pyproject._py_
+++ b/tests/test_integration_/test_integration_pyproject._py_
@@ -8,3 +8,4 @@ class F:
 
 
 print("hello world")
+assert t.uname == "\udce4\udcf6\udcfc"
diff --git a/tests/test_integration_/test_integration_pyproject.yml b/tests/test_integration_/test_integration_pyproject.yml
index c69b929..26ccc38 100644
--- a/tests/test_integration_/test_integration_pyproject.yml
+++ b/tests/test_integration_/test_integration_pyproject.yml
@@ -3,7 +3,7 @@ err:
 out:
 - "--- .../test_integration_pyproject0/code.py\t(original)"
 - "+++ .../test_integration_pyproject0/code.py\t(reformatted)"
-- '@@ -1,11 +1,11 @@'
+- '@@ -1,12 +1,12 @@'
 - ' class F:'
 - "-\tfrom collections import ("
 - -Iterable,
@@ -17,8 +17,10 @@ out:
 - " \t\tpass"
 - ''
 - -print('hello world')
+- -assert t.uname == '\udce4\udcf6\udcfc'
 - ''
 - +print("hello world")
+- +assert t.uname == "\udce4\udcf6\udcfc"
 - +
 - ''
 - ''
diff --git a/tests/test_integration_/test_reformatter_class._py_ b/tests/test_integration_/test_reformatter_class._py_
index 6ec3a75..8e47018 100644
--- a/tests/test_integration_/test_reformatter_class._py_
+++ b/tests/test_integration_/test_reformatter_class._py_
@@ -8,3 +8,4 @@ class F:
 
 
 print("hello world")
+assert t.uname == "\udce4\udcf6\udcfc"