Rename test to tests; fix equator length.

tests/test_direction.py

@@ -0,0 +1,43 @@
+"""
+Test direction processing.
+"""
+import numpy as np
+
+from roentgen.direction import DirectionSet, parse_vector
+
+__author__ = "Sergey Vartanov"
+__email__ = "me@enzet.ru"
+
+
+def test_compass_points_1() -> None:
+    """Test north direction."""
+    assert np.allclose(parse_vector("N"), np.array([0, -1]))
+
+
+def test_compass_points_2() -> None:
+    """Test north-west direction."""
+    root: np.float64 = -np.sqrt(2) / 2
+    assert np.allclose(parse_vector("NW"), np.array([root, root]))
+
+
+def test_compass_points_3() -> None:
+    """Test south-south-west direction."""
+    assert np.allclose(parse_vector("SSW"), np.array([-0.38268343, 0.92387953]))
+
+
+def test_invalid() -> None:
+    """Test invalid direction representation string."""
+    assert not parse_vector("O")
+
+
+def test_degree() -> None:
+    """Test east direction."""
+    assert np.allclose(parse_vector("90"), np.array([1, 0]))
+
+
+def test_main_direction() -> None:
+    """Test main direction computing."""
+    assert DirectionSet("0").is_right() is None
+    assert DirectionSet("70").is_right() is True
+    assert DirectionSet("270").is_right() is False
+    assert DirectionSet("180").is_right() is None