diff --git a/tests/pkg_c25519/tests/01-run.py b/tests/pkg_c25519/tests/01-run.py
index 0513bf0547..03f41f2d9a 100755
--- a/tests/pkg_c25519/tests/01-run.py
+++ b/tests/pkg_c25519/tests/01-run.py
@@ -10,17 +10,15 @@
 import os
 import sys
 
+from testrunner import run_check_unittests
+from testrunner import TIMEOUT as DEFAULT_TIMEOUT
 
-def testfunc(child):
-    board = os.environ['BOARD']
-    # Increase timeout on "real" hardware
-    # 170 seconds on `arduino-mega2560`
-    timeout = 200 if board != 'native' else -1
-    child.expect(r"OK \(2 tests\)", timeout=timeout)
+
+BOARD = os.environ['BOARD']
+# Increase timeout on "real" hardware
+# 170 seconds on `arduino-mega2560`
+TIMEOUT = 200 if BOARD != 'native' else DEFAULT_TIMEOUT
 
 
 if __name__ == "__main__":
-    sys.path.append(os.path.join(os.environ['RIOTBASE'],
-                                 'dist/tools/testrunner'))
-    from testrunner import run
-    sys.exit(run(testfunc))
+    sys.exit(run_check_unittests(timeout=TIMEOUT))
diff --git a/tests/pkg_libcose/tests/01-run.py b/tests/pkg_libcose/tests/01-run.py
index b1a37921bd..0118273127 100755
--- a/tests/pkg_libcose/tests/01-run.py
+++ b/tests/pkg_libcose/tests/01-run.py
@@ -8,20 +8,15 @@
 
 import os
 import sys
-from testrunner import run
+from testrunner import run_check_unittests
+from testrunner import TIMEOUT as DEFAULT_TIMEOUT
 
 
+BOARD = os.environ['BOARD']
 # on real hardware, this test application can take several minutes to
 # complete (~4min on microbit)
-HW_TIMEOUT = 300
-
-
-def testfunc(child):
-    board = os.environ['BOARD']
-    # Increase timeout on "real" hardware
-    timeout = HW_TIMEOUT if board != 'native' else -1
-    child.expect(r'OK \(\d+ tests\)', timeout=timeout)
+TIMEOUT = 300 if BOARD != 'native' else DEFAULT_TIMEOUT
 
 
 if __name__ == "__main__":
-    sys.exit(run(testfunc))
+    sys.exit(run_check_unittests(timeout=TIMEOUT))
diff --git a/tests/pkg_tweetnacl/tests/01-run.py b/tests/pkg_tweetnacl/tests/01-run.py
index 21d5cd8205..00e770623b 100755
--- a/tests/pkg_tweetnacl/tests/01-run.py
+++ b/tests/pkg_tweetnacl/tests/01-run.py
@@ -8,14 +8,14 @@
 
 import os
 import sys
-from testrunner import run
+from testrunner import run, check_unittests
 
 
 def testfunc(child):
     board = os.environ['BOARD']
     # Increase timeout on "real" hardware
     timeout = 120 if board != 'native' else -1
-    child.expect(r'OK \(\d+ tests\)', timeout=timeout)
+    check_unittests(child, timeout=timeout)
 
 
 if __name__ == "__main__":