[testing] Add basic unit tests for config parsing/writing.

Author: acoster

tests/config_test.py

@@ -0,0 +1,49 @@
+import os
+
+import pytest
+import tomlkit
+from busytag.config import ToolConfig
+from busytag.types import LedConfig, LedPin
+
+
+@pytest.fixture
+def testdata_path():
+    def _testdata_path(name):
+        return os.path.join(os.path.dirname(__file__), 'testdata',
+                            f"{name}.toml")
+
+    return _testdata_path
+
+
+def test_loads_config_with_device(testdata_path):
+    config = ToolConfig(testdata_path('config-with-device'))
+    assert config.device == '/dev/tty.usbmodem'
+
+
+def test_loads_config_with_led_preset(testdata_path):
+    config = ToolConfig(testdata_path('config-with-led-patterns'))
+    expected_rb_pattern = {
+        LedConfig(
+            pins=LedPin.PIN_0 | LedPin.PIN_2 | LedPin.PIN_4 | LedPin.PIN_6,
+            color='FF0000'),
+        LedConfig(
+            pins=LedPin.PIN_1 | LedPin.PIN_3 | LedPin.PIN_5,
+            color='0000FF'
+        )
+    }
+
+    diff = set(config.get_led_preset('rb')) ^ expected_rb_pattern
+    assert not diff
+
+
+
+def test_writes_config(tmp_path):
+    p = tmp_path / 'config_with_device.toml'
+    config = ToolConfig(str(p))
+
+    assert config.device is None
+    config.device = '/dev/tty.somedevice'
+    config.write_to_file()
+
+    c = tomlkit.loads(p.read_text())
+    assert c['device'] == '/dev/tty.somedevice'

tests/testdata/config-with-device.toml

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+device = "/dev/tty.usbmodem"

tests/testdata/config-with-led-patterns.toml

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+[[led_presets.green]]
+pins = 127
+color = '00FF00'
+
+[[led_presets.rb]]
+pins = 85
+color = 'FF0000'
+
+[[led_presets.rb]]
+pins = 42
+color = '0000FF'