diff --git a/tests/conftest.py b/tests/conftest.py
index db460f7..353ab9d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -21,7 +21,11 @@ def gpiod():
 
 @pytest.fixture(scope='function', autouse=False)
 def gpiodevice():
-    sys.modules['gpiodevice'] = mock.Mock()
+    gpiodevice = mock.Mock()
+    gpiodevice.get_pins_for_platform.return_value = [(mock.Mock(), 0), (mock.Mock(), 0)]
+    gpiodevice.get_pin.return_value = (mock.Mock(), 0)
+
+    sys.modules['gpiodevice'] = gpiodevice
     yield sys.modules['gpiodevice']
     del sys.modules['gpiodevice']
 
diff --git a/tests/test_setup.py b/tests/test_setup.py
index 0ffd7f5..40ceeb1 100644
--- a/tests/test_setup.py
+++ b/tests/test_setup.py
@@ -3,21 +3,18 @@
 import pytest
 
 
-def test_setup(gpiod):
+def test_setup(gpiod, gpiodevice):
     """Test init succeeds and GPIO pins are set up."""
     import blinkt
-    with pytest.raises((RuntimeError, SystemExit)):
-        blinkt.show()
+    blinkt.show()
 
 
-def test_set_pins(gpiod):
+def test_set_pins(gpiod, gpiodevice):
     import blinkt
-
-    with pytest.raises((RuntimeError, SystemExit)):
-        blinkt.set_pins("PIN1", "PIN2")
+    blinkt.set_pins("PIN1", "PIN2")
 
 
-def test_set_pixel(gpiod):
+def test_set_pixel(gpiod, gpiodevice):
     import blinkt
     blinkt.set_brightness(1.0)
 
@@ -30,7 +27,7 @@ def test_set_pixel(gpiod):
     assert blinkt.get_pixel(2)[0:3] == (0, 0, 255)
 
 
-def test_set_all_and_clear(gpiod):
+def test_set_all_and_clear(gpiod, gpiodevice):
     import blinkt
     blinkt.set_brightness(1.0)
 
@@ -45,7 +42,7 @@ def test_set_all_and_clear(gpiod):
         assert blinkt.get_pixel(0)[0:3] == (0, 0, 0)
 
 
-def test_brightness(gpiod):
+def test_brightness(gpiod, gpiodevice):
     import blinkt
     blinkt.set_brightness(1.0)
 
@@ -58,7 +55,7 @@ def test_brightness(gpiod):
         blinkt.set_brightness(-1)
 
 
-def test_show(gpiod, gpiod_request):
+def test_show(gpiod, gpiodevice, gpiod_request):
     import blinkt
 
     blinkt.clk_lines = gpiod_request
@@ -73,4 +70,4 @@ def test_show(gpiod, gpiod_request):
         mock.call(0, blinkt.Value.INACTIVE),  # Dat line low
         mock.call(1, blinkt.Value.ACTIVE),    # Clock pin high
         mock.call(1, blinkt.Value.INACTIVE)   # Clock pin low
-    ))
\ No newline at end of file
+    ))