diff --git a/test/test_highsnr_stdio_C_P_datacx.py b/test/test_highsnr_stdio_C_P_datacx.py
index ac34b55d..fa5f4ba9 100644
--- a/test/test_highsnr_stdio_C_P_datacx.py
+++ b/test/test_highsnr_stdio_C_P_datacx.py
@@ -4,6 +4,7 @@ Tests a high signal-to-noise ratio path with codec2 data formats using codec2 to
 
 # pylint: disable=global-statement, invalid-name, unused-import
 
+import contextlib
 import glob
 import multiprocessing
 import os
@@ -13,14 +14,16 @@ import time
 
 import pytest
 
-try:
+BURSTS = 1
+FRAMESPERBURST = 1
+TESTFRAMES = 3
+
+with contextlib.suppress(KeyError):
     BURSTS = int(os.environ["BURSTS"])
+with contextlib.suppress(KeyError):
     FRAMESPERBURST = int(os.environ["FRAMESPERBURST"])
+with contextlib.suppress(KeyError):
     TESTFRAMES = int(os.environ["TESTFRAMES"])
-except KeyError:
-    BURSTS = 1
-    FRAMESPERBURST = 1
-    TESTFRAMES = 3
 
 # For some reason, sometimes, this test requires the current directory to be `test`.
 # Try to adapt dynamically. I still want to figure out why but as a workaround,
diff --git a/test/test_highsnr_stdio_P_C_datacx.py b/test/test_highsnr_stdio_P_C_datacx.py
index 47f6d533..ea5316df 100644
--- a/test/test_highsnr_stdio_P_C_datacx.py
+++ b/test/test_highsnr_stdio_P_C_datacx.py
@@ -4,6 +4,7 @@ Tests a high signal-to-noise ratio path with codec2 data formats using codec2 to
 
 # pylint: disable=global-statement, invalid-name, unused-import
 
+import contextlib
 import glob
 import multiprocessing
 import os
@@ -13,14 +14,16 @@ import time
 
 import pytest
 
-try:
+BURSTS = 1
+FRAMESPERBURST = 1
+TESTFRAMES = 3
+
+with contextlib.suppress(KeyError):
     BURSTS = int(os.environ["BURSTS"])
+with contextlib.suppress(KeyError):
     FRAMESPERBURST = int(os.environ["FRAMESPERBURST"])
+with contextlib.suppress(KeyError):
     TESTFRAMES = int(os.environ["TESTFRAMES"])
-except KeyError:
-    BURSTS = 1
-    FRAMESPERBURST = 1
-    TESTFRAMES = 3
 
 # For some reason, sometimes, this test requires the current directory to be `test`.
 # Try to adapt dynamically. I still want to figure out why but as a workaround,
diff --git a/test/test_highsnr_stdio_P_P_datacx.py b/test/test_highsnr_stdio_P_P_datacx.py
index 8975a6d6..634d5164 100644
--- a/test/test_highsnr_stdio_P_P_datacx.py
+++ b/test/test_highsnr_stdio_P_P_datacx.py
@@ -4,6 +4,7 @@ Tests a high signal-to-noise ratio path with codec2 data formats.
 
 # pylint: disable=global-statement, invalid-name, unused-import
 
+import contextlib
 import multiprocessing
 import os
 import subprocess
@@ -12,14 +13,16 @@ import time
 
 import pytest
 
-try:
+BURSTS = 1
+FRAMESPERBURST = 1
+TESTFRAMES = 3
+
+with contextlib.suppress(KeyError):
     BURSTS = int(os.environ["BURSTS"])
+with contextlib.suppress(KeyError):
     FRAMESPERBURST = int(os.environ["FRAMESPERBURST"])
+with contextlib.suppress(KeyError):
     TESTFRAMES = int(os.environ["TESTFRAMES"])
-except KeyError:
-    BURSTS = 1
-    FRAMESPERBURST = 1
-    TESTFRAMES = 3
 
 # For some reason, sometimes, this test requires the current directory to be `test`.
 # Try to adapt dynamically. I still want to figure out why but as a workaround,
diff --git a/test/test_highsnr_stdio_P_P_multi.py b/test/test_highsnr_stdio_P_P_multi.py
index cba9bb07..17f44781 100644
--- a/test/test_highsnr_stdio_P_P_multi.py
+++ b/test/test_highsnr_stdio_P_P_multi.py
@@ -4,6 +4,7 @@ Tests a high signal-to-noise ratio path with multiple codec2 data formats.
 
 # pylint: disable=global-statement, invalid-name, unused-import
 
+import contextlib
 import multiprocessing
 import os
 import subprocess
@@ -12,14 +13,16 @@ import time
 
 import pytest
 
-try:
+BURSTS = 1
+FRAMESPERBURST = 1
+TESTFRAMES = 3
+
+with contextlib.suppress(KeyError):
     BURSTS = int(os.environ["BURSTS"])
+with contextlib.suppress(KeyError):
     FRAMESPERBURST = int(os.environ["FRAMESPERBURST"])
+with contextlib.suppress(KeyError):
     TESTFRAMES = int(os.environ["TESTFRAMES"])
-except KeyError:
-    BURSTS = 1
-    FRAMESPERBURST = 1
-    TESTFRAMES = 3
 
 # For some reason, sometimes, this test requires the current directory to be `test`.
 # Try to adapt dynamically. I still want to figure out why but as a workaround,