From e9c93677beeb6c6416d8f15aa2bd29ce3cd4b726 Mon Sep 17 00:00:00 2001
From: Phil Howard <phil@gadgetoid.com>
Date: Tue, 17 Mar 2020 12:31:33 +0000
Subject: [PATCH 1/1] Test noise, fix gas

---
 library/tests/conftest.py   | 17 ++++++++
 library/tests/test_noise.py | 78 +++++++++++++++++++++++++++++++++++++
 library/tests/test_setup.py | 34 +++++++++++++++-
 3 files changed, 128 insertions(+), 1 deletion(-)
 create mode 100644 library/tests/test_noise.py

diff --git a/library/tests/conftest.py b/library/tests/conftest.py
index 8a3ffb4..b026172 100644
--- a/library/tests/conftest.py
+++ b/library/tests/conftest.py
@@ -54,3 +54,20 @@ def atexit():
     yield atexit
     del sys.modules['atexit']
 
+
+@pytest.fixture(scope='function', autouse=False)
+def sounddevice():
+    """Mock sounddevice module."""
+    sounddevice = mock.MagicMock()
+    sys.modules['sounddevice'] = sounddevice
+    yield sounddevice
+    del sys.modules['sounddevice']
+
+
+@pytest.fixture(scope='function', autouse=False)
+def numpy():
+    """Mock numpy module."""
+    numpy = mock.MagicMock()
+    sys.modules['numpy'] = numpy
+    yield numpy
+    del sys.modules['numpy']
diff --git a/library/tests/test_noise.py b/library/tests/test_noise.py
new file mode 100644
index 0000000..c93f8cc
--- /dev/null
+++ b/library/tests/test_noise.py
@@ -0,0 +1,78 @@
+import sys
+import mock
+import pytest
+
+
+def force_reimport(module):
+    """Force the module under test to be re-imported.
+
+    Because pytest runs all tests within the same scope (this makes me cry)
+    we have to do some manual housekeeping to avoid tests polluting each other.
+
+    Since conftest.py already does some sys.modules mangling I see no reason not to
+    do the same thing here.
+    """
+    if "." in module:
+        steps = module.split(".")
+    else:
+        steps = [module]
+    
+    for i in range(len(steps)):
+        module = ".".join(steps[0:i + 1])
+        try:
+            del sys.modules[module]
+        except KeyError:
+            pass
+
+
+def test_noise_setup(sounddevice, numpy):
+    force_reimport('enviroplus.noise')
+    from enviroplus.noise import Noise
+
+    noise = Noise(sample_rate=16000, duration=0.1)
+    del noise
+
+
+def test_noise_get_amplitudes_at_frequency_ranges(sounddevice, numpy):
+    # Ippity zippidy what is this farce
+    # a curious function that makes my tests pass?
+    force_reimport('enviroplus.noise')
+    from enviroplus.noise import Noise
+
+    noise = Noise(sample_rate=16000, duration=0.1)
+    noise.get_amplitudes_at_frequency_ranges([
+        (100, 500),
+        (501, 1000)
+    ])
+
+    sounddevice.rec.assert_called_with(0.1 * 16000, samplerate=16000, blocking=True, channels=1, dtype='float64')
+
+
+def test_noise_get_noise_profile(sounddevice, numpy):
+    # Ippity zippidy what is this farce
+    # a curious function that makes my tests pass?
+    force_reimport('enviroplus.noise')
+    from enviroplus.noise import Noise
+
+    noise = Noise(sample_rate=16000, duration=0.1)
+    amp_low, amp_mid, amp_high, amp_total = noise.get_noise_profile(
+        noise_floor=100,
+        low=0.12,
+        mid=0.36,
+        high=None)
+
+    sounddevice.rec.assert_called_with(0.1 * 16000, samplerate=16000, blocking=True, channels=1, dtype='float64')
+
+
+def test_get_amplitude_at_frequency_range(sounddevice, numpy):
+    # Ippity zippidy what is this farce
+    # a curious function that makes my tests pass?
+    force_reimport('enviroplus.noise')
+    from enviroplus.noise import Noise
+
+    noise = Noise(sample_rate=16000, duration=0.1)
+
+    noise.get_amplitude_at_frequency_range(0, 8000)
+
+    with pytest.raises(ValueError):
+        noise.get_amplitude_at_frequency_range(0, 16000)
diff --git a/library/tests/test_setup.py b/library/tests/test_setup.py
index 95080b6..6b6658c 100644
--- a/library/tests/test_setup.py
+++ b/library/tests/test_setup.py
@@ -2,6 +2,28 @@ import sys
 import mock
 
 
+def force_reimport(module):
+    """Force the module under test to be re-imported.
+
+    Because pytest runs all tests within the same scope (this makes me cry)
+    we have to do some manual housekeeping to avoid tests polluting each other.
+
+    Since conftest.py already does some sys.modules mangling I see no reason not to
+    do the same thing here.
+    """
+    if "." in module:
+        steps = module.split(".")
+    else:
+        steps = [module]
+    
+    for i in range(len(steps)):
+        module = ".".join(steps[0:i + 1])
+        try:
+            del sys.modules[module]
+        except KeyError:
+            pass
+
+
 def test_gas_setup(GPIO, smbus):
     from enviroplus import gas
     gas._is_setup = False
@@ -49,7 +71,8 @@ def test_gas_read_adc_default_gain(GPIO, smbus):
     gas._is_setup = False
 
     gas.enable_adc(True)
-    assert gas.read_adc() == 0.255
+    gas.set_adc_gain(gas.MICS6814_GAIN)
+    assert gas.read_adc() == 0.765
 
 
 def test_gas_read_adc_str(GPIO, smbus):
@@ -59,3 +82,12 @@ def test_gas_read_adc_str(GPIO, smbus):
     gas.enable_adc(True)
     gas.set_adc_gain(2.048)
     assert 'ADC' in str(gas.read_all())
+
+
+def test_gas_cleanup(GPIO, smbus):
+    force_reimport('enviroplus.gas')
+    from enviroplus import gas
+
+    gas.cleanup()
+
+    GPIO.output.assert_called_with(gas.MICS6814_HEATER_PIN, 0)
-- 
2.30.2