diff --git a/tests/extmod/btree1.py b/tests/extmod/btree1.py
index 2127554db..59638ef0a 100644
--- a/tests/extmod/btree1.py
+++ b/tests/extmod/btree1.py
@@ -4,8 +4,7 @@ try:
     import uerrno
 except ImportError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 #f = open("_test.db", "w+b")
 f = uio.BytesIO()
diff --git a/tests/extmod/framebuf1.py b/tests/extmod/framebuf1.py
index 990b0b120..2c1366522 100644
--- a/tests/extmod/framebuf1.py
+++ b/tests/extmod/framebuf1.py
@@ -2,8 +2,7 @@ try:
     import framebuf
 except ImportError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 w = 5
 h = 16
diff --git a/tests/extmod/framebuf16.py b/tests/extmod/framebuf16.py
index 3aa1d34de..fe81f7f93 100644
--- a/tests/extmod/framebuf16.py
+++ b/tests/extmod/framebuf16.py
@@ -2,8 +2,7 @@ try:
     import framebuf
 except ImportError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 def printbuf():
     print("--8<--")
diff --git a/tests/extmod/framebuf4.py b/tests/extmod/framebuf4.py
index 641f5bfc5..8358fa55b 100644
--- a/tests/extmod/framebuf4.py
+++ b/tests/extmod/framebuf4.py
@@ -2,8 +2,7 @@ try:
     import framebuf
 except ImportError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 def printbuf():
     print("--8<--")
diff --git a/tests/extmod/machine1.py b/tests/extmod/machine1.py
index e0c561168..6ff38cc05 100644
--- a/tests/extmod/machine1.py
+++ b/tests/extmod/machine1.py
@@ -8,8 +8,7 @@ try:
     machine.mem8
 except:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 print(machine.mem8)
 
diff --git a/tests/extmod/machine_pinbase.py b/tests/extmod/machine_pinbase.py
index 5e82823ec..e91775504 100644
--- a/tests/extmod/machine_pinbase.py
+++ b/tests/extmod/machine_pinbase.py
@@ -6,8 +6,7 @@ try:
     machine.PinBase
 except AttributeError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 
 class MyPin(machine.PinBase):
diff --git a/tests/extmod/machine_pulse.py b/tests/extmod/machine_pulse.py
index 6491b5409..d525974e0 100644
--- a/tests/extmod/machine_pulse.py
+++ b/tests/extmod/machine_pulse.py
@@ -7,8 +7,7 @@ try:
     machine.time_pulse_us
 except AttributeError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 
 class ConstPin(machine.PinBase):
diff --git a/tests/extmod/machine_signal.py b/tests/extmod/machine_signal.py
index 96b8f43c7..53f4f5890 100644
--- a/tests/extmod/machine_signal.py
+++ b/tests/extmod/machine_signal.py
@@ -9,8 +9,7 @@ try:
     machine.Signal
 except AttributeError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 class Pin(machine.PinBase):
     def __init__(self):
diff --git a/tests/extmod/time_ms_us.py b/tests/extmod/time_ms_us.py
index 2078f1bb5..31f07d31b 100644
--- a/tests/extmod/time_ms_us.py
+++ b/tests/extmod/time_ms_us.py
@@ -1,10 +1,9 @@
-import sys
 import utime
 try:
     utime.sleep_ms
 except AttributeError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 utime.sleep_ms(1)
 utime.sleep_us(1)
diff --git a/tests/extmod/ubinascii_a2b_base64.py b/tests/extmod/ubinascii_a2b_base64.py
index 58eb0b50b..b35f26591 100644
--- a/tests/extmod/ubinascii_a2b_base64.py
+++ b/tests/extmod/ubinascii_a2b_base64.py
@@ -4,9 +4,8 @@ try:
     except ImportError:
         import binascii
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 print(binascii.a2b_base64(b''))
 print(binascii.a2b_base64(b'Zg=='))
diff --git a/tests/extmod/ubinascii_b2a_base64.py b/tests/extmod/ubinascii_b2a_base64.py
index 1c0c30311..f4bb69fe0 100644
--- a/tests/extmod/ubinascii_b2a_base64.py
+++ b/tests/extmod/ubinascii_b2a_base64.py
@@ -4,9 +4,8 @@ try:
     except ImportError:
         import binascii
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 print(binascii.b2a_base64(b''))
 print(binascii.b2a_base64(b'f'))
diff --git a/tests/extmod/ubinascii_crc32.py b/tests/extmod/ubinascii_crc32.py
index b82c44d6b..89664a9b3 100644
--- a/tests/extmod/ubinascii_crc32.py
+++ b/tests/extmod/ubinascii_crc32.py
@@ -4,16 +4,14 @@ try:
     except ImportError:
         import binascii
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 try:
     binascii.crc32
 except AttributeError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 print(hex(binascii.crc32(b'The quick brown fox jumps over the lazy dog')))
 print(hex(binascii.crc32(b'\x00' * 32)))
diff --git a/tests/extmod/ubinascii_hexlify.py b/tests/extmod/ubinascii_hexlify.py
index 5d70bda96..bc9928747 100644
--- a/tests/extmod/ubinascii_hexlify.py
+++ b/tests/extmod/ubinascii_hexlify.py
@@ -4,9 +4,8 @@ try:
     except ImportError:
         import binascii
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 print(binascii.hexlify(b'\x00\x01\x02\x03\x04\x05\x06\x07'))
 print(binascii.hexlify(b'\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f'))
diff --git a/tests/extmod/ubinascii_micropython.py b/tests/extmod/ubinascii_micropython.py
index 96f566bd1..a4c00a2cb 100644
--- a/tests/extmod/ubinascii_micropython.py
+++ b/tests/extmod/ubinascii_micropython.py
@@ -4,9 +4,8 @@ try:
     except ImportError:
         import binascii
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # two arguments supported in uPy but not CPython
 a = binascii.hexlify(b'123', ':')
diff --git a/tests/extmod/ubinascii_unhexlify.py b/tests/extmod/ubinascii_unhexlify.py
index e669789ba..865abfe3a 100644
--- a/tests/extmod/ubinascii_unhexlify.py
+++ b/tests/extmod/ubinascii_unhexlify.py
@@ -4,9 +4,8 @@ try:
     except ImportError:
         import binascii
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 print(binascii.unhexlify(b'0001020304050607'))
 print(binascii.unhexlify(b'08090a0b0c0d0e0f'))
diff --git a/tests/extmod/uctypes_32bit_intbig.py b/tests/extmod/uctypes_32bit_intbig.py
index a082dc370..6b4d3d76c 100644
--- a/tests/extmod/uctypes_32bit_intbig.py
+++ b/tests/extmod/uctypes_32bit_intbig.py
@@ -3,9 +3,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 buf = b"12345678abcd"
 struct = uctypes.struct(
diff --git a/tests/extmod/uctypes_array_assign_le.py b/tests/extmod/uctypes_array_assign_le.py
index bae467d09..6afa7e0a2 100644
--- a/tests/extmod/uctypes_array_assign_le.py
+++ b/tests/extmod/uctypes_array_assign_le.py
@@ -1,9 +1,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     # arr is array at offset 0, of UINT8 elements, array size is 2
diff --git a/tests/extmod/uctypes_array_assign_native_le.py b/tests/extmod/uctypes_array_assign_native_le.py
index f0ecc0dad..a538bf9ad 100644
--- a/tests/extmod/uctypes_array_assign_native_le.py
+++ b/tests/extmod/uctypes_array_assign_native_le.py
@@ -3,11 +3,11 @@ try:
     import uctypes
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 if sys.byteorder != "little":
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     # arr is array at offset 0, of UINT8 elements, array size is 2
diff --git a/tests/extmod/uctypes_array_assign_native_le_intbig.py b/tests/extmod/uctypes_array_assign_native_le_intbig.py
index f29a3b66e..84dfba0e2 100644
--- a/tests/extmod/uctypes_array_assign_native_le_intbig.py
+++ b/tests/extmod/uctypes_array_assign_native_le_intbig.py
@@ -3,11 +3,11 @@ try:
     import uctypes
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 if sys.byteorder != "little":
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     # arr is array at offset 0, of UINT8 elements, array size is 2
diff --git a/tests/extmod/uctypes_bytearray.py b/tests/extmod/uctypes_bytearray.py
index bf7845ab2..61c7da271 100644
--- a/tests/extmod/uctypes_bytearray.py
+++ b/tests/extmod/uctypes_bytearray.py
@@ -1,9 +1,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     "arr": (uctypes.ARRAY | 0, uctypes.UINT8 | 2),
diff --git a/tests/extmod/uctypes_le.py b/tests/extmod/uctypes_le.py
index 829beda58..7df5ac090 100644
--- a/tests/extmod/uctypes_le.py
+++ b/tests/extmod/uctypes_le.py
@@ -1,9 +1,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     "s0": uctypes.UINT16 | 0,
diff --git a/tests/extmod/uctypes_le_float.py b/tests/extmod/uctypes_le_float.py
index a61305ba8..84ff2b84c 100644
--- a/tests/extmod/uctypes_le_float.py
+++ b/tests/extmod/uctypes_le_float.py
@@ -1,9 +1,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     "f32": uctypes.FLOAT32 | 0,
diff --git a/tests/extmod/uctypes_native_float.py b/tests/extmod/uctypes_native_float.py
index 80cb54383..acef47036 100644
--- a/tests/extmod/uctypes_native_float.py
+++ b/tests/extmod/uctypes_native_float.py
@@ -1,9 +1,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     "f32": uctypes.FLOAT32 | 0,
diff --git a/tests/extmod/uctypes_native_le.py b/tests/extmod/uctypes_native_le.py
index 5900224d4..8bba03b38 100644
--- a/tests/extmod/uctypes_native_le.py
+++ b/tests/extmod/uctypes_native_le.py
@@ -6,11 +6,11 @@ try:
     import uctypes
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 if sys.byteorder != "little":
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 desc = {
diff --git a/tests/extmod/uctypes_print.py b/tests/extmod/uctypes_print.py
index 76a009dc7..c310238e5 100644
--- a/tests/extmod/uctypes_print.py
+++ b/tests/extmod/uctypes_print.py
@@ -2,9 +2,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # we use an address of "0" because we just want to print something deterministic
 # and don't actually need to set/get any values in the struct
diff --git a/tests/extmod/uctypes_ptr_le.py b/tests/extmod/uctypes_ptr_le.py
index e8a6243ce..056e45650 100644
--- a/tests/extmod/uctypes_ptr_le.py
+++ b/tests/extmod/uctypes_ptr_le.py
@@ -3,11 +3,11 @@ try:
     import uctypes
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 if sys.byteorder != "little":
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     "ptr": (uctypes.PTR | 0, uctypes.UINT8),
diff --git a/tests/extmod/uctypes_ptr_native_le.py b/tests/extmod/uctypes_ptr_native_le.py
index 9b016c04d..24508b1cb 100644
--- a/tests/extmod/uctypes_ptr_native_le.py
+++ b/tests/extmod/uctypes_ptr_native_le.py
@@ -3,11 +3,11 @@ try:
     import uctypes
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 if sys.byteorder != "little":
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 desc = {
diff --git a/tests/extmod/uctypes_sizeof.py b/tests/extmod/uctypes_sizeof.py
index 266cd0694..5a6adb437 100644
--- a/tests/extmod/uctypes_sizeof.py
+++ b/tests/extmod/uctypes_sizeof.py
@@ -1,9 +1,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 desc = {
     # arr is array at offset 0, of UINT8 elements, array size is 2
diff --git a/tests/extmod/uctypes_sizeof_native.py b/tests/extmod/uctypes_sizeof_native.py
index f676c8c6d..32c740e77 100644
--- a/tests/extmod/uctypes_sizeof_native.py
+++ b/tests/extmod/uctypes_sizeof_native.py
@@ -1,9 +1,8 @@
 try:
     import uctypes
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 S1 = {}
 assert uctypes.sizeof(S1) == 0
diff --git a/tests/extmod/uhashlib_sha1.py b/tests/extmod/uhashlib_sha1.py
index f12fc649a..4f7066899 100644
--- a/tests/extmod/uhashlib_sha1.py
+++ b/tests/extmod/uhashlib_sha1.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uhashlib as hashlib
 except ImportError:
@@ -8,14 +7,14 @@ except ImportError:
         # This is neither uPy, nor cPy, so must be uPy with
         # uhashlib module disabled.
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 try:
     hashlib.sha1
 except AttributeError:
     # SHA1 is only available on some ports
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 sha1 = hashlib.sha1(b'hello')
 sha1.update(b'world')
diff --git a/tests/extmod/uhashlib_sha256.py b/tests/extmod/uhashlib_sha256.py
index ff51f2ffa..3200e8f5c 100644
--- a/tests/extmod/uhashlib_sha256.py
+++ b/tests/extmod/uhashlib_sha256.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uhashlib as hashlib
 except ImportError:
@@ -8,7 +7,7 @@ except ImportError:
         # This is neither uPy, nor cPy, so must be uPy with
         # uhashlib module disabled.
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 
 h = hashlib.sha256()
diff --git a/tests/extmod/uheapq1.py b/tests/extmod/uheapq1.py
index 4b0e5de57..7c1fe4e1e 100644
--- a/tests/extmod/uheapq1.py
+++ b/tests/extmod/uheapq1.py
@@ -4,9 +4,8 @@ except:
     try:
         import heapq
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 try:
     heapq.heappop([])
diff --git a/tests/extmod/ujson_dumps.py b/tests/extmod/ujson_dumps.py
index 4a02f5170..d73271801 100644
--- a/tests/extmod/ujson_dumps.py
+++ b/tests/extmod/ujson_dumps.py
@@ -4,9 +4,8 @@ except ImportError:
     try:
         import json
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 print(json.dumps(False))
 print(json.dumps(True))
diff --git a/tests/extmod/ujson_dumps_extra.py b/tests/extmod/ujson_dumps_extra.py
index a52e8224c..21a388c32 100644
--- a/tests/extmod/ujson_dumps_extra.py
+++ b/tests/extmod/ujson_dumps_extra.py
@@ -3,8 +3,7 @@
 try:
     import ujson
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 print(ujson.dumps(b'1234'))
diff --git a/tests/extmod/ujson_dumps_float.py b/tests/extmod/ujson_dumps_float.py
index d949ea6dd..e8cceb6f1 100644
--- a/tests/extmod/ujson_dumps_float.py
+++ b/tests/extmod/ujson_dumps_float.py
@@ -4,8 +4,7 @@ except ImportError:
     try:
         import json
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 print(json.dumps(1.2))
diff --git a/tests/extmod/ujson_load.py b/tests/extmod/ujson_load.py
index 901132a5f..9725ab2dd 100644
--- a/tests/extmod/ujson_load.py
+++ b/tests/extmod/ujson_load.py
@@ -6,9 +6,8 @@ except:
         from io import StringIO
         import json
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 print(json.load(StringIO('null')))
 print(json.load(StringIO('"abc\\u0064e"')))
diff --git a/tests/extmod/ujson_loads.py b/tests/extmod/ujson_loads.py
index b2e18e3af..adba3c068 100644
--- a/tests/extmod/ujson_loads.py
+++ b/tests/extmod/ujson_loads.py
@@ -4,9 +4,8 @@ except ImportError:
     try:
         import json
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 def my_print(o):
     if isinstance(o, dict):
diff --git a/tests/extmod/ujson_loads_float.py b/tests/extmod/ujson_loads_float.py
index b20a412ff..f1b8cc364 100644
--- a/tests/extmod/ujson_loads_float.py
+++ b/tests/extmod/ujson_loads_float.py
@@ -4,9 +4,8 @@ except ImportError:
     try:
         import json
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 def my_print(o):
     print('%.3f' % o)
diff --git a/tests/extmod/urandom_basic.py b/tests/extmod/urandom_basic.py
index 885b8517f..57e6b26cb 100644
--- a/tests/extmod/urandom_basic.py
+++ b/tests/extmod/urandom_basic.py
@@ -4,9 +4,8 @@ except ImportError:
     try:
         import random
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 # check getrandbits returns a value within the bit range
 for b in (1, 2, 3, 4, 16, 32):
diff --git a/tests/extmod/urandom_extra.py b/tests/extmod/urandom_extra.py
index 925dd0dbc..f5a34e168 100644
--- a/tests/extmod/urandom_extra.py
+++ b/tests/extmod/urandom_extra.py
@@ -4,16 +4,14 @@ except ImportError:
     try:
         import random
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 try:
     random.randint
 except AttributeError:
-    import sys
     print('SKIP')
-    sys.exit()
+    raise SystemExit
 
 print('randrange')
 for i in range(50):
diff --git a/tests/extmod/ure1.py b/tests/extmod/ure1.py
index a867f1751..1f38b8087 100644
--- a/tests/extmod/ure1.py
+++ b/tests/extmod/ure1.py
@@ -4,9 +4,8 @@ except ImportError:
     try:
         import re
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 r = re.compile(".+")
 m = r.match("abc")
diff --git a/tests/extmod/ure_debug.py b/tests/extmod/ure_debug.py
index 252df21e3..cfb264bb6 100644
--- a/tests/extmod/ure_debug.py
+++ b/tests/extmod/ure_debug.py
@@ -2,8 +2,7 @@
 try:
     import ure
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 ure.compile('^a|b[0-9]\w$', ure.DEBUG)
diff --git a/tests/extmod/ure_error.py b/tests/extmod/ure_error.py
index 3f16f9158..f52f735c7 100644
--- a/tests/extmod/ure_error.py
+++ b/tests/extmod/ure_error.py
@@ -6,9 +6,8 @@ except ImportError:
     try:
         import re
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 def test_re(r):
     try:
diff --git a/tests/extmod/ure_group.py b/tests/extmod/ure_group.py
index 98aae2a73..4e39468c5 100644
--- a/tests/extmod/ure_group.py
+++ b/tests/extmod/ure_group.py
@@ -6,9 +6,8 @@ except ImportError:
     try:
         import re
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 def print_groups(match):
     print('----')
diff --git a/tests/extmod/ure_namedclass.py b/tests/extmod/ure_namedclass.py
index e233f17c8..215d09613 100644
--- a/tests/extmod/ure_namedclass.py
+++ b/tests/extmod/ure_namedclass.py
@@ -6,9 +6,8 @@ except ImportError:
     try:
         import re
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 def print_groups(match):
     print('----')
diff --git a/tests/extmod/ure_split.py b/tests/extmod/ure_split.py
index 1e411c27c..317ca9892 100644
--- a/tests/extmod/ure_split.py
+++ b/tests/extmod/ure_split.py
@@ -4,9 +4,8 @@ except ImportError:
     try:
         import re
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 r = re.compile(" ")
 s = r.split("a b c foobar")
diff --git a/tests/extmod/ure_split_empty.py b/tests/extmod/ure_split_empty.py
index ad6334eba..76ce97ea6 100644
--- a/tests/extmod/ure_split_empty.py
+++ b/tests/extmod/ure_split_empty.py
@@ -7,9 +7,8 @@
 try:
     import ure as re
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 r = re.compile(" *")
 s = r.split("a b    c   foobar")
diff --git a/tests/extmod/ure_split_notimpl.py b/tests/extmod/ure_split_notimpl.py
index eca3ea512..da6e9652d 100644
--- a/tests/extmod/ure_split_notimpl.py
+++ b/tests/extmod/ure_split_notimpl.py
@@ -1,9 +1,8 @@
 try:
     import ure as re
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 r = re.compile('( )')
 try:
diff --git a/tests/extmod/ussl_basic.py b/tests/extmod/ussl_basic.py
index e9d435bca..9f8019a0b 100644
--- a/tests/extmod/ussl_basic.py
+++ b/tests/extmod/ussl_basic.py
@@ -5,8 +5,7 @@ try:
     import ussl as ssl
 except ImportError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 # create in client mode
 try:
diff --git a/tests/extmod/utimeq1.py b/tests/extmod/utimeq1.py
index 68d69e25e..dc7f3b660 100644
--- a/tests/extmod/utimeq1.py
+++ b/tests/extmod/utimeq1.py
@@ -5,8 +5,7 @@ try:
     from utimeq import utimeq
 except ImportError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 DEBUG = 0
 
diff --git a/tests/extmod/utimeq_stable.py b/tests/extmod/utimeq_stable.py
index 9f6ba76d4..9fb522d51 100644
--- a/tests/extmod/utimeq_stable.py
+++ b/tests/extmod/utimeq_stable.py
@@ -2,8 +2,7 @@ try:
     from utimeq import utimeq
 except ImportError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 h = utimeq(10)
 
diff --git a/tests/extmod/uzlib_decompio.py b/tests/extmod/uzlib_decompio.py
index 6f07c048c..112a82597 100644
--- a/tests/extmod/uzlib_decompio.py
+++ b/tests/extmod/uzlib_decompio.py
@@ -2,9 +2,8 @@ try:
     import uzlib as zlib
     import uio as io
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 # Raw DEFLATE bitstream
diff --git a/tests/extmod/uzlib_decompio_gz.py b/tests/extmod/uzlib_decompio_gz.py
index 7572e9693..02087f763 100644
--- a/tests/extmod/uzlib_decompio_gz.py
+++ b/tests/extmod/uzlib_decompio_gz.py
@@ -2,9 +2,8 @@ try:
     import uzlib as zlib
     import uio as io
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 # gzip bitstream
diff --git a/tests/extmod/uzlib_decompress.py b/tests/extmod/uzlib_decompress.py
index 10121ee7e..63247955c 100644
--- a/tests/extmod/uzlib_decompress.py
+++ b/tests/extmod/uzlib_decompress.py
@@ -4,9 +4,8 @@ except ImportError:
     try:
         import uzlib as zlib
     except ImportError:
-        import sys
         print("SKIP")
-        sys.exit()
+        raise SystemExit
 
 PATTERNS = [
     # Packed results produced by CPy's zlib.compress()
diff --git a/tests/extmod/vfs_basic.py b/tests/extmod/vfs_basic.py
index fc016b8d5..995874824 100644
--- a/tests/extmod/vfs_basic.py
+++ b/tests/extmod/vfs_basic.py
@@ -9,8 +9,7 @@ try:
     uos.mount
 except (ImportError, AttributeError):
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 
 class Filesystem:
diff --git a/tests/extmod/vfs_fat_fileio1.py b/tests/extmod/vfs_fat_fileio1.py
index 9036df7a5..d19df120b 100644
--- a/tests/extmod/vfs_fat_fileio1.py
+++ b/tests/extmod/vfs_fat_fileio1.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uerrno
     try:
@@ -8,13 +7,13 @@ try:
         import uos
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 try:
     uos.VfsFat
 except AttributeError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 class RAMFS:
@@ -46,7 +45,7 @@ try:
     bdev = RAMFS(50)
 except MemoryError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 uos.VfsFat.mkfs(bdev)
 vfs = uos.VfsFat(bdev)
diff --git a/tests/extmod/vfs_fat_fileio2.py b/tests/extmod/vfs_fat_fileio2.py
index b2a0ba70f..b5adb75c9 100644
--- a/tests/extmod/vfs_fat_fileio2.py
+++ b/tests/extmod/vfs_fat_fileio2.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uerrno
     try:
@@ -8,13 +7,13 @@ try:
         import uos
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 try:
     uos.VfsFat
 except AttributeError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 class RAMFS:
@@ -46,7 +45,7 @@ try:
     bdev = RAMFS(50)
 except MemoryError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 uos.VfsFat.mkfs(bdev)
 vfs = uos.VfsFat(bdev)
diff --git a/tests/extmod/vfs_fat_more.py b/tests/extmod/vfs_fat_more.py
index dacb21553..baec96787 100644
--- a/tests/extmod/vfs_fat_more.py
+++ b/tests/extmod/vfs_fat_more.py
@@ -1,4 +1,3 @@
-import sys
 import uerrno
 try:
     try:
@@ -8,13 +7,13 @@ try:
         import uos
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 try:
     uos.VfsFat
 except AttributeError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 class RAMFS:
@@ -47,7 +46,7 @@ try:
     bdev2 = RAMFS(50)
 except MemoryError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # first we umount any existing mount points the target may have
 try:
diff --git a/tests/extmod/vfs_fat_oldproto.py b/tests/extmod/vfs_fat_oldproto.py
index 3e66758c3..ef4f1da78 100644
--- a/tests/extmod/vfs_fat_oldproto.py
+++ b/tests/extmod/vfs_fat_oldproto.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uerrno
     try:
@@ -7,13 +6,13 @@ try:
         import uos
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 try:
     uos.VfsFat
 except AttributeError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 class RAMFS_OLD:
 
@@ -43,7 +42,7 @@ try:
     bdev = RAMFS_OLD(50)
 except MemoryError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 uos.VfsFat.mkfs(bdev)
 vfs = uos.VfsFat(bdev)
diff --git a/tests/extmod/vfs_fat_ramdisk.py b/tests/extmod/vfs_fat_ramdisk.py
index fe72a8bef..801c69786 100644
--- a/tests/extmod/vfs_fat_ramdisk.py
+++ b/tests/extmod/vfs_fat_ramdisk.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uerrno
     try:
@@ -7,13 +6,13 @@ try:
         import uos
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 try:
     uos.VfsFat
 except AttributeError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 class RAMFS:
@@ -45,7 +44,7 @@ try:
     bdev = RAMFS(50)
 except MemoryError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 uos.VfsFat.mkfs(bdev)
 
diff --git a/tests/extmod/websocket_basic.py b/tests/extmod/websocket_basic.py
index 770836c8e..9a80503a0 100644
--- a/tests/extmod/websocket_basic.py
+++ b/tests/extmod/websocket_basic.py
@@ -3,9 +3,8 @@ try:
     import uerrno
     import websocket
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # put raw data in the stream and do a websocket read
 def ws_read(msg, sz):
diff --git a/tests/io/buffered_writer.py b/tests/io/buffered_writer.py
index bb7b4e8db..c2cedb991 100644
--- a/tests/io/buffered_writer.py
+++ b/tests/io/buffered_writer.py
@@ -4,9 +4,8 @@ try:
     io.BytesIO
     io.BufferedWriter
 except AttributeError:
-    import sys
     print('SKIP')
-    sys.exit()
+    raise SystemExit
 
 bts = io.BytesIO()
 buf = io.BufferedWriter(bts, 8)
diff --git a/tests/io/open_append.py b/tests/io/open_append.py
index 2120b72f0..a696823bc 100644
--- a/tests/io/open_append.py
+++ b/tests/io/open_append.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uos as os
 except ImportError:
@@ -6,7 +5,7 @@ except ImportError:
 
 if not hasattr(os, "unlink"):
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # cleanup in case testfile exists
 try:
diff --git a/tests/io/open_plus.py b/tests/io/open_plus.py
index 98598ee67..bba96fa2f 100644
--- a/tests/io/open_plus.py
+++ b/tests/io/open_plus.py
@@ -1,4 +1,3 @@
-import sys
 try:
     import uos as os
 except ImportError:
@@ -6,7 +5,7 @@ except ImportError:
 
 if not hasattr(os, "unlink"):
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # cleanup in case testfile exists
 try:
diff --git a/tests/io/resource_stream.py b/tests/io/resource_stream.py
index 86975f118..37d985bf1 100644
--- a/tests/io/resource_stream.py
+++ b/tests/io/resource_stream.py
@@ -5,7 +5,7 @@ try:
     uio.resource_stream
 except AttributeError:
     print('SKIP')
-    sys.exit()
+    raise SystemExit
 
 buf = uio.resource_stream("data", "file2")
 print(buf.read())
diff --git a/tests/io/write_ext.py b/tests/io/write_ext.py
index 19b616174..5a6eaa35c 100644
--- a/tests/io/write_ext.py
+++ b/tests/io/write_ext.py
@@ -5,9 +5,8 @@ import uio
 try:
     uio.BytesIO
 except AttributeError:
-    import sys
     print('SKIP')
-    sys.exit()
+    raise SystemExit
 
 buf = uio.BytesIO()
 
diff --git a/tests/jni/list.py b/tests/jni/list.py
index 6725abb5a..d58181d0b 100644
--- a/tests/jni/list.py
+++ b/tests/jni/list.py
@@ -1,10 +1,9 @@
-import sys
 import jni
 try:
     ArrayList = jni.cls("java/util/ArrayList")
 except:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 l = ArrayList()
 print(l)
diff --git a/tests/jni/object.py b/tests/jni/object.py
index 6cf936c4d..aa67615ec 100644
--- a/tests/jni/object.py
+++ b/tests/jni/object.py
@@ -1,10 +1,9 @@
-import sys
 import jni
 try:
     Integer = jni.cls("java/lang/Integer")
 except:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # Create object
 i = Integer(42)
diff --git a/tests/jni/system_out.py b/tests/jni/system_out.py
index 7a1f18030..86c4b9e11 100644
--- a/tests/jni/system_out.py
+++ b/tests/jni/system_out.py
@@ -1,9 +1,8 @@
-import sys
 try:
     import jni
     System = jni.cls("java/lang/System")
 except:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 System.out.println("Hello, Java!")
diff --git a/tests/micropython/heapalloc_bytesio.py b/tests/micropython/heapalloc_bytesio.py
index 2a8d50abe..4aae2abf0 100644
--- a/tests/micropython/heapalloc_bytesio.py
+++ b/tests/micropython/heapalloc_bytesio.py
@@ -1,9 +1,8 @@
 try:
     import uio
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 import micropython
 
diff --git a/tests/micropython/heapalloc_iter.py b/tests/micropython/heapalloc_iter.py
index 45d3519e4..79461f999 100644
--- a/tests/micropython/heapalloc_iter.py
+++ b/tests/micropython/heapalloc_iter.py
@@ -2,9 +2,8 @@
 try:
     import array
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 try:
     from micropython import heap_lock, heap_unlock
diff --git a/tests/micropython/heapalloc_traceback.py b/tests/micropython/heapalloc_traceback.py
index b3795293f..f4212b6ce 100644
--- a/tests/micropython/heapalloc_traceback.py
+++ b/tests/micropython/heapalloc_traceback.py
@@ -5,9 +5,8 @@ import sys
 try:
     import uio
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # preallocate exception instance with some room for a traceback
 global_exc = StopIteration()
diff --git a/tests/micropython/heapalloc_traceback.py.exp b/tests/micropython/heapalloc_traceback.py.exp
index facd0af13..291bbd697 100644
--- a/tests/micropython/heapalloc_traceback.py.exp
+++ b/tests/micropython/heapalloc_traceback.py.exp
@@ -1,5 +1,5 @@
 StopIteration
 Traceback (most recent call last):
-  File  , line 23, in test
+  File  , line 22, in test
 StopIteration: 
 
diff --git a/tests/micropython/kbd_intr.py b/tests/micropython/kbd_intr.py
index a7ce7464b..879c9a229 100644
--- a/tests/micropython/kbd_intr.py
+++ b/tests/micropython/kbd_intr.py
@@ -6,8 +6,7 @@ try:
     micropython.kbd_intr
 except AttributeError:
     print('SKIP')
-    import sys
-    sys.exit()
+    raise SystemExit
 
 # just check we can actually call it
 micropython.kbd_intr(3)
diff --git a/tests/micropython/schedule.py b/tests/micropython/schedule.py
index 3d584eea4..74f90cb2d 100644
--- a/tests/micropython/schedule.py
+++ b/tests/micropython/schedule.py
@@ -6,8 +6,7 @@ try:
     micropython.schedule
 except AttributeError:
     print('SKIP')
-    import sys
-    sys.exit()
+    raise SystemExit
 
 # Basic test of scheduling a function.
 
diff --git a/tests/misc/non_compliant.py b/tests/misc/non_compliant.py
index 31074ab01..b4c90e9fc 100644
--- a/tests/misc/non_compliant.py
+++ b/tests/misc/non_compliant.py
@@ -4,9 +4,8 @@ try:
     import array
     import ustruct
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # when super can't find self
 try:
diff --git a/tests/misc/print_exception.py b/tests/misc/print_exception.py
index b833a7981..9ab8e728b 100644
--- a/tests/misc/print_exception.py
+++ b/tests/misc/print_exception.py
@@ -6,7 +6,7 @@ try:
         import io
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 if hasattr(sys, 'print_exception'):
     print_exception = sys.print_exception
diff --git a/tests/misc/recursive_data.py b/tests/misc/recursive_data.py
index 383018945..3b7fa5095 100644
--- a/tests/misc/recursive_data.py
+++ b/tests/misc/recursive_data.py
@@ -2,9 +2,8 @@
 try:
     import uio as io
 except ImportError:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 l = [1, 2, 3, None]
 l[-1] = l
diff --git a/tests/misc/recursive_iternext.py b/tests/misc/recursive_iternext.py
index d90f17716..edb5a843f 100644
--- a/tests/misc/recursive_iternext.py
+++ b/tests/misc/recursive_iternext.py
@@ -6,9 +6,8 @@ try:
     max
     zip
 except:
-    import sys
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 # We need to pick an N that is large enough to hit the recursion
 # limit, but not too large that we run out of heap memory.
diff --git a/tests/misc/sys_exc_info.py b/tests/misc/sys_exc_info.py
index de5b82562..4bb2c61e8 100644
--- a/tests/misc/sys_exc_info.py
+++ b/tests/misc/sys_exc_info.py
@@ -3,7 +3,7 @@ try:
     sys.exc_info
 except:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 def f():
     print(sys.exc_info()[0:2])
diff --git a/tests/pyb/can.py b/tests/pyb/can.py
index 7f2d070ec..0fd8c8368 100644
--- a/tests/pyb/can.py
+++ b/tests/pyb/can.py
@@ -2,8 +2,7 @@ try:
     from pyb import CAN
 except ImportError:
     print('SKIP')
-    import sys
-    sys.exit()
+    raise SystemExit
 
 import pyb
 
diff --git a/tests/pyb/dac.py b/tests/pyb/dac.py
index 942f30354..6f03bbc64 100644
--- a/tests/pyb/dac.py
+++ b/tests/pyb/dac.py
@@ -2,8 +2,7 @@ import pyb
 
 if not hasattr(pyb, 'DAC'):
     print('SKIP')
-    import sys
-    sys.exit()
+    raise SystemExit
 
 dac = pyb.DAC(1)
 print(dac)
diff --git a/tests/pyb/pyb_f405.py b/tests/pyb/pyb_f405.py
index 3c81fe109..2f161ae09 100644
--- a/tests/pyb/pyb_f405.py
+++ b/tests/pyb/pyb_f405.py
@@ -4,8 +4,7 @@ import os, pyb
 
 if not 'STM32F405' in os.uname().machine:
     print('SKIP')
-    import sys
-    sys.exit()
+    raise SystemExit
 
 print(pyb.freq())
 print(type(pyb.rng()))
diff --git a/tests/pyb/pyb_f411.py b/tests/pyb/pyb_f411.py
index 328653965..50de30282 100644
--- a/tests/pyb/pyb_f411.py
+++ b/tests/pyb/pyb_f411.py
@@ -4,7 +4,6 @@ import os, pyb
 
 if not 'STM32F411' in os.uname().machine:
     print('SKIP')
-    import sys
-    sys.exit()
+    raise SystemExit
 
 print(pyb.freq())
diff --git a/tests/unix/extra_coverage.py b/tests/unix/extra_coverage.py
index 870e7d5f2..7a496aa87 100644
--- a/tests/unix/extra_coverage.py
+++ b/tests/unix/extra_coverage.py
@@ -2,8 +2,7 @@ try:
     extra_coverage
 except NameError:
     print("SKIP")
-    import sys
-    sys.exit()
+    raise SystemExit
 
 import uerrno
 import uio
diff --git a/tests/unix/ffi_callback.py b/tests/unix/ffi_callback.py
index 7f8af15b3..23b058bce 100644
--- a/tests/unix/ffi_callback.py
+++ b/tests/unix/ffi_callback.py
@@ -1,9 +1,8 @@
-import sys
 try:
     import ffi
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 def ffi_open(names):
diff --git a/tests/unix/ffi_float.py b/tests/unix/ffi_float.py
index cc12fa7ad..c92a39bcd 100644
--- a/tests/unix/ffi_float.py
+++ b/tests/unix/ffi_float.py
@@ -1,10 +1,9 @@
 # test ffi float support
-import sys
 try:
     import ffi
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 def ffi_open(names):
diff --git a/tests/unix/ffi_float2.py b/tests/unix/ffi_float2.py
index d635a2714..721eb4d19 100644
--- a/tests/unix/ffi_float2.py
+++ b/tests/unix/ffi_float2.py
@@ -1,10 +1,9 @@
 # test ffi float support
-import sys
 try:
     import ffi
 except ImportError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 
 def ffi_open(names):
@@ -25,7 +24,7 @@ try:
     tgammaf = libm.func('f', 'tgammaf', 'f')
 except OSError:
     print("SKIP")
-    sys.exit()
+    raise SystemExit
 
 for fun in (tgammaf,):
     for val in (0.5, 1, 1.0, 1.5, 4, 4.0):