diff --git a/tests/test_fslsub.py b/tests/test_fslsub.py
index 07f5a39f061ea0fe4a1a21d3e3c361f1f4f5c450..5de9bcf9e3a743a5600fa1bf204ac8e91dca76ae 100644
--- a/tests/test_fslsub.py
+++ b/tests/test_fslsub.py
@@ -19,8 +19,8 @@ from fsl.utils.tempdir import tempdir
 from . import mockFSLDIR
 
 
-mock_fsl_sub = f"""
-#!{sys.executable}
+mock_fsl_sub = """
+#!{}
 
 import random
 import os
@@ -56,7 +56,7 @@ with open(f'{{cmd}}.o{{jobid}}', 'w') as stdout, \
 
 print(str(jobid))
 sys.exit(0)
-""".strip()
+""".format(sys.executable).strip()
 
 
 @contextlib.contextmanager
diff --git a/tests/test_wrappers.py b/tests/test_wrappers.py
index f1eda504b0a8ddcb501b8ba9e0a7ff231ebe007e..1759672a94c96c77cbe7946d86431d63b4cd0e83 100644
--- a/tests/test_wrappers.py
+++ b/tests/test_wrappers.py
@@ -105,7 +105,7 @@ def test_applyxfm():
         assert checkResult(result.stdout[0], *expected)
 
 
-def test_applyxfm():
+def test_applyxfm4D():
     with asrt.disabled(), run.dryrun(), mockFSLDIR(bin=('applyxfm4D',)) as fsldir:
         applyxfm = op.join(fsldir, 'bin', 'applyxfm4D')
         result   = fw.applyxfm4D(