Add unit tests (interactive for now)

setup.cfg

@@ -0,0 +1,7 @@
+[tool:pytest]
+testpaths = tests
+
+[coverage:run]
+branch = True
+source =
+    ovgenpy

tests/test_trigger.py

@@ -0,0 +1,38 @@
+import matplotlib.pyplot as plt
+
+from ovgenpy import triggers
+from matplotlib.axes import Axes
+from matplotlib.figure import Figure
+
+from ovgenpy.triggers import CorrelationTrigger
+from ovgenpy.wave import Wave
+
+
+triggers.SHOW_TRIGGER = False
+
+cfg = CorrelationTrigger.Config(
+    trigger_strength=1,
+    responsiveness=1,
+    falloff_width=2,
+)
+
+
+def test_trigger():
+    wave = Wave(None, 'tests/sine440.wav')
+    trigger = cfg(wave, 4000)
+
+    BIG = 0.95
+    SMALL = 0.05
+    fig, axes = plt.subplots(5, gridspec_kw=dict(
+        top=BIG, right=BIG,
+        bottom=SMALL, left=SMALL,
+    ))    # type: Figure, Axes
+    fig.tight_layout()
+
+    for i, ax in enumerate(axes):
+        if i:
+            print(trigger.get_trigger(4000))
+        ax.plot(trigger._buffer, label=str(i))
+        ax.grid()
+
+    plt.show()