QA: Fix tests.

GPIO setup tests have been pruned and could use rewriting.
PIL is now always assumed to be installed.

tests/conftest.py

@@ -12,17 +12,33 @@
 from tools import MockSMBus
 
 
+@pytest.fixture(scope='function', autouse=True)
+def cleanup():
+    for module in list(sys.modules.keys()):
+        if module.startswith('inky'):
+            del sys.modules[module]
+
+
+@pytest.fixture(scope='function', autouse=False)
+def nopath():
+    path = sys.path
+    sys.path = [path for path in sys.path if not path.startswith("/usr/lib") and not path.startswith("/opt/hostedtoolcache")]
+    yield
+    sys.path = path
+
+
 @pytest.fixture(scope='function', autouse=False)
 def GPIO():
-    """Mock RPi.GPIO module."""
-    GPIO = mock.MagicMock()
-    # Fudge for Python < 37 (possibly earlier)
-    sys.modules['RPi'] = mock.MagicMock()
-    sys.modules['RPi'].GPIO = GPIO
-    sys.modules['RPi.GPIO'] = GPIO
-    yield GPIO
-    del sys.modules['RPi']
-    del sys.modules['RPi.GPIO']
+    """Mock gpiod and gpiodevice modules."""
+    gpiod = mock.MagicMock()
+    gpiodevice = mock.MagicMock()
+    sys.modules['gpiod'] = gpiod
+    sys.modules['gpiodevice'] = gpiodevice
+    sys.modules['gpiodevice.platform'] = mock.MagicMock()
+    yield gpiod, gpiodevice
+    del sys.modules['gpiod']
+    del sys.modules['gpiodevice']
+    del sys.modules['gpiodevice.platform']
 
 
 @pytest.fixture(scope='function', autouse=False)

tests/test_init.py

@@ -1,6 +1,6 @@
 """Initialization tests for Inky."""
 
-from unittest import mock
+import sys
 
 import pytest
 
@@ -19,141 +19,87 @@ def test_init_mock_what_black(tkinter, PIL):
     InkyMockWHAT('black')
 
 
-def test_init_phat_black(spidev, smbus2):
+def test_init_phat_black(spidev, smbus2, PIL):
     """Test initialisation of InkyPHAT with 'black' colour choice."""
     from inky import InkyPHAT
 
     InkyPHAT('black')
 
 
-def test_init_phat_red(spidev, smbus2):
+def test_init_phat_red(spidev, smbus2, PIL):
     """Test initialisation of InkyPHAT with 'red' colour choice."""
     from inky import InkyPHAT
 
     InkyPHAT('red')
 
 
-def test_init_phat_yellow(spidev, smbus2):
+def test_init_phat_yellow(spidev, smbus2, PIL):
     """Test initialisation of InkyPHAT with 'yellow' colour choice."""
     from inky import InkyPHAT
 
     InkyPHAT('red')
 
 
-def test_init_what_black(spidev, smbus2):
+def test_init_what_black(spidev, smbus2, PIL):
     """Test initialisation of InkyWHAT with 'black' colour choice."""
     from inky import InkyWHAT
 
     InkyWHAT('black')
 
 
-def test_init_what_red(spidev, smbus2):
+def test_init_what_red(spidev, smbus2, PIL):
     """Test initialisation of InkyWHAT with 'red' colour choice."""
     from inky import InkyWHAT
 
     InkyWHAT('red')
 
 
-def test_init_what_yellow(spidev, smbus2):
+def test_init_what_yellow(spidev, smbus2, PIL):
     """Test initialisation of InkyWHAT with 'yellow' colour choice."""
     from inky import InkyWHAT
 
     InkyWHAT('yellow')
 
 
-def test_init_invalid_colour(spidev, smbus2):
+def test_init_invalid_colour(spidev, smbus2, PIL):
     """Test initialisation of InkyWHAT with an invalid colour choice."""
     from inky import InkyWHAT
 
     with pytest.raises(ValueError):
         InkyWHAT('octarine')
 
 
-def test_init_what_setup_no_gpio(spidev, smbus2):
-    """Test Inky init with a missing RPi.GPIO library."""
-    from inky import InkyWHAT
-
-    inky = InkyWHAT('red')
-
-    with pytest.raises(ImportError):
-        inky.setup()
-
-
-def test_init_what_setup(spidev, smbus2, GPIO):
+def test_init_what_setup(spidev, smbus2, GPIO, PIL):
     """Test initialisation and setup of InkyWHAT.
 
     Verify our expectations for GPIO setup in order to catch regressions.
 
     """
     from inky import InkyWHAT
 
-    # TODO: _busy_wait should timeout after N seconds
-    GPIO.input.return_value = GPIO.LOW
+    # _busy_wait will timeout after N seconds
+    # GPIO.input.return_value = GPIO.LOW
 
     inky = InkyWHAT('red')
     inky.setup()
 
-    # Check GPIO setup
-    GPIO.setwarnings.assert_called_with(False)
-    GPIO.setmode.assert_called_with(GPIO.BCM)
-    GPIO.setup.assert_has_calls([
-        mock.call(inky.dc_pin, GPIO.OUT, initial=GPIO.LOW, pull_up_down=GPIO.PUD_OFF),
-        mock.call(inky.reset_pin, GPIO.OUT, initial=GPIO.HIGH, pull_up_down=GPIO.PUD_OFF),
-        mock.call(inky.busy_pin, GPIO.IN, pull_up_down=GPIO.PUD_OFF)
-    ])
-
-    # Check device will been reset
-    GPIO.output.assert_has_calls([
-        mock.call(inky.reset_pin, GPIO.LOW),
-        mock.call(inky.reset_pin, GPIO.HIGH)
-    ])
-
     # Check API will been opened
     spidev.SpiDev().open.assert_called_with(0, inky.cs_channel)
 
 
-def test_init_7colour_setup_no_gpio(spidev, smbus2):
-    """Test initialisation and setup of 7-colour Inky.
-
-    Verify an error is raised when RPi.GPIO is not present.
-
-    """
-    from inky.inky_uc8159 import Inky
-
-    inky = Inky()
-
-    with pytest.raises(ImportError):
-        inky.setup()
-
-
-def test_init_7colour_setup(spidev, smbus2, GPIO):
+def test_init_7colour_setup(spidev, smbus2, GPIO, PIL):
     """Test initialisation and setup of 7-colour Inky.
 
     Verify our expectations for GPIO setup in order to catch regressions.
 
     """
     from inky.inky_uc8159 import Inky
 
-    # TODO: _busy_wait should timeout after N seconds
-    GPIO.input.return_value = GPIO.LOW
+    # _busy_wait will timeout after N seconds
+    # GPIO.input.return_value = GPIO.LOW
 
     inky = Inky()
     inky.setup()
 
-    # Check GPIO setup
-    GPIO.setwarnings.assert_called_with(False)
-    GPIO.setmode.assert_called_with(GPIO.BCM)
-    GPIO.setup.assert_has_calls([
-        mock.call(inky.dc_pin, GPIO.OUT, initial=GPIO.LOW, pull_up_down=GPIO.PUD_OFF),
-        mock.call(inky.reset_pin, GPIO.OUT, initial=GPIO.HIGH, pull_up_down=GPIO.PUD_OFF),
-        mock.call(inky.busy_pin, GPIO.IN, pull_up_down=GPIO.PUD_OFF)
-    ])
-
-    # Check device will been reset
-    GPIO.output.assert_has_calls([
-        mock.call(inky.reset_pin, GPIO.LOW),
-        mock.call(inky.reset_pin, GPIO.HIGH)
-    ])
-
     # Check API will been opened
     spidev.SpiDev().open.assert_called_with(0, inky.cs_channel)

tests/test_install_helpers.py

@@ -8,33 +8,18 @@
 import pytest
 
 
-def test_mock_phat_no_tkinter():
+def test_mock_phat_no_tkinter(PIL, nopath):
     """Test initialisation of InkyMockPHAT without tkinter."""
     from inky import InkyMockPHAT
 
     with pytest.raises(ImportError):
         InkyMockPHAT('black')
 
 
-def test_mock_what_no_tkinter():
+def test_mock_what_no_tkinter(PIL, nopath):
     """Test initialisation of InkyMockWHAT without tkinter."""
     from inky import InkyMockWHAT
 
     with pytest.raises(ImportError):
         InkyMockWHAT('black')
 
-
-def test_mock_phat_no_pil(tkinter):
-    """Test initialisation of InkyMockPHAT without PIL."""
-    from inky import InkyMockPHAT
-
-    with pytest.raises(ImportError):
-        InkyMockPHAT('black')
-
-
-def test_mock_what_no_pil(tkinter):
-    """Test initialisation of InkyMockWHAT without PIL."""
-    from inky import InkyMockWHAT
-
-    with pytest.raises(ImportError):
-        InkyMockWHAT('black')