test: added Tests for Point.java

Author: Aaron

src/test/java/com/thealgorithms/geometry/PointTest.java

@@ -0,0 +1,116 @@
+package com.thealgorithms.geometry;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class PointTest {
+
+    @Test
+    void testCompareTo() {
+        Point p1 = new Point (1, 2);
+        Point p2 = new Point(5, -1);
+        Point p3 = new Point(3, 9);
+        Point p4 = new Point(3, 9);
+        assertEquals(1,p1.compareTo(p2));
+        assertEquals(-1,p2.compareTo(p3));
+        assertEquals(0,p3.compareTo(p4));
+    }
+
+    @Test
+    void testToString() {
+        Point p1 = new Point (-3, 5);
+        assertEquals("(-3, 5)",p1.toString());
+    }
+
+
+    @Test
+    void testPolarOrder() {
+        Point p = new Point(0,0);
+        assertNotNull(p.polarOrder());
+    }
+
+    @Test
+    void testOrientation() {
+        // setup points
+        Point pA = new Point(0, 0);
+        Point pB = new Point(1, 0);
+        Point pC = new Point(1, 1);
+
+        // test for left curve
+        assertEquals(1, Point.orientation(pA, pB, pC));
+
+        //test for right curve
+        pB = new Point(0, 1);
+        assertEquals(-1, Point.orientation(pA, pB, pC));
+
+        //test for left curve
+        pC = new Point(-1, 1);
+        assertEquals(1, Point.orientation(pA, pB, pC));
+
+        //test for right curve
+        pB = new Point(1,0);
+        pC = new Point(1,-1);
+        assertEquals(-1, Point.orientation(pA, pB, pC));
+
+        //test for collinearity
+        pB = new Point(1, 1);
+        pC = new Point(2, 2);
+        assertEquals(0, Point.orientation(pA, pB, pC));
+    }
+
+    @Test
+    void testPolarOrderCompare() {
+        Point ref = new Point(0,0);
+
+        Point p1 = new Point(1,1);
+        Point p2 = new Point(1,-1);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+
+        p1 = new Point(3,0);
+        p2 = new Point(2,0);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+
+        p1 = new Point(0,1);
+        p2 = new Point(-1,1);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+
+        p1 = new Point(1,1);
+        p2 = new Point(2,2);
+        assertEquals(0, ref.polarOrder().compare(p1, p2));
+
+        p1 = new Point(1,2);
+        p2 = new Point(2,1);
+        assertTrue(ref.polarOrder().compare(p1, p2) > 0);
+
+        p1 = new Point(2,1);
+        p2 = new Point(1,2);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+
+        p1 = new Point(-1,0);
+        p2 = new Point(-2,0);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+
+        p1 = new Point(2,3);
+        p2 = new Point(2,3);
+        assertEquals(0, ref.polarOrder().compare(p1, p2));
+
+        p1 = new Point(0,1);
+        p2 = new Point(0,-1);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+
+        ref = new Point(1,1);
+
+        p1 = new Point(1,2);
+        p2 = new Point(2,2);
+        assertTrue(ref.polarOrder().compare(p1, p2) > 0);
+
+        p1 = new Point(2,1);
+        p2 = new Point(2,0);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+
+        p1 = new Point(0,1);
+        p2 = new Point(1,0);
+        assertTrue(ref.polarOrder().compare(p1, p2) < 0);
+    }
+}