Update test_triangle.py

Expand triangle module tests

Author: marcostfermin

test/test_triangle.py

@@ -1,4 +1,7 @@
 import cmath
+import math
+import pytest
+
 from electricpy.geometry import triangle
 from electricpy.geometry import Point
 from test import compare_points
@@ -66,4 +69,132 @@ def test_1(self):
         p2 = Point(1, 0)
         p3 = Point(1*cmath.cos(cmath.pi/3), 1*cmath.sin(cmath.pi/3))
         t = triangle.Triangle(p1, p2, p3)
-        assert compare_points(t.circum_center(), Point(0.5, cmath.sqrt(3)/6))
+        assert compare_points(t.circum_center(), Point(0.5, cmath.sqrt(3)/6))
+
+
+def test_triangle_perimeter_and_area():
+    p1 = Point(0, 0)
+    p2 = Point(3, 0)
+    p3 = Point(0, 4)
+    t = triangle.Triangle(p1, p2, p3)
+    assert t.perimeter() == 12
+    assert t.perimeters() == 12
+    assert t.area() == 6
+
+
+def test_triangle_radii():
+    p1 = Point(0, 0)
+    p2 = Point(3, 0)
+    p3 = Point(0, 4)
+    t = triangle.Triangle(p1, p2, p3)
+    assert t.in_radius() == 1
+    assert t.circum_radius() == 2.5
+
+
+def test_triangle_invalid_points():
+    p1 = Point(0, 0)
+    p2 = Point(1, 1)
+    p3 = Point(2, 2)
+    with pytest.raises(ValueError):
+        triangle.Triangle(p1, p2, p3)
+
+
+def test_triangle_init_validation_and_helpers():
+    with pytest.raises(ValueError):
+        triangle.Triangle(Point(0, 0), Point(1, 0))
+
+    with pytest.raises(TypeError):
+        triangle.Triangle(Point(0, 0), (1, 0), Point(0, 1))
+
+    with pytest.raises(ValueError):
+        triangle.Triangle(Point(0, 0), Point(0, 0), Point(1, 1))
+
+    assert triangle._as_float(1) == 1.0
+    assert triangle._as_float(1 + 1e-13j) == 1.0
+    with pytest.raises(ValueError):
+        triangle._as_float(1 + 1e-3j)
+
+    assert triangle._is_close(1.0, 1.0 + 1e-10)
+    assert not triangle._is_close(1.0, 1.01, rel_tol=1e-6, abs_tol=1e-6)
+
+    p0 = Point(0, 0)
+    p1 = Point(2, 0)
+    p2 = Point(0, 2)
+    assert triangle._triangle_twice_area(p0, p1, p2) == 4.0
+
+
+def test_triangle_area_and_centers_errors():
+    tri = object.__new__(triangle.Triangle)
+    tri.points = (Point(0, 0), Point(1, 0), Point(0, 1))
+    tri._tol = 1e-12
+    tri.a = 0.0
+    tri.b = 0.0
+    tri.c = 0.0
+
+    with pytest.raises(ValueError):
+        tri.in_center()
+
+    with pytest.raises(ValueError):
+        tri.in_radius()
+
+    tri2 = object.__new__(triangle.Triangle)
+    tri2.points = (Point(0, 0), Point(1, 0), Point(0, 1))
+    tri2._tol = 1e-12
+    tri2.a = 1.0
+    tri2.b = 1.0
+    tri2.c = 3.0
+
+    with pytest.raises(ValueError):
+        tri2.area()
+
+    tri3 = object.__new__(triangle.Triangle)
+    tri3.points = (Point(0, 0), Point(1, 0), Point(0, 1))
+    tri3._tol = 1e-12
+    tri3.a = 1.0
+    tri3.b = 1.0
+    tri3.c = 2.0
+
+    with pytest.raises(ValueError):
+        tri3.circum_radius()
+
+    tri4 = object.__new__(triangle.Triangle)
+    tri4.points = (Point(0, 0), Point(1, 0), Point(0, 1))
+    tri4._tol = 1e-12
+    tri4.a = 1.0
+    tri4.b = 1.0
+    tri4.c = 2.0 + 1e-13
+    assert tri4.area() == 0.0
+
+
+def test_triangle_validation_helper():
+    tri = object.__new__(triangle.Triangle)
+    tri.points = (Point(0, 0), Point(1, 0), Point(2, 0))
+    tri._tol = 1e-12
+    tri.a = 1.0
+    tri.b = 1.0
+    tri.c = 2.1
+    assert not tri._Triangle__is_valid()
+
+    tri.c = 2.0
+    assert not tri._Triangle__is_valid()
+
+    tri.a = 1.0
+    tri.b = 3.0
+    tri.c = 1.0
+    assert not tri._Triangle__is_valid()
+
+    tri.a = 3.0
+    tri.b = 1.0
+    tri.c = 1.0
+    assert not tri._Triangle__is_valid()
+
+    tri.a = 1.0
+    tri.b = 1.0
+    tri.c = 1.0
+    assert not tri._Triangle__is_valid()
+
+    tri.points = (Point(0, 0), Point(1, 0), Point(0, 1))
+    tri.a = math.sqrt(2)
+    tri.b = 1.0
+    tri.c = 1.0
+    assert tri._Triangle__is_valid()