Working on debugging line of best fit code.

tests/LineTest.java

@@ -0,0 +1,57 @@
+import org.junit.jupiter.api.Test;
+import processing.core.PApplet;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static java.lang.Math.abs;
+import static org.junit.jupiter.api.Assertions.*;
+
+class LineTest{
+    public void assertFloatEquals(float expected, float actual){
+        assertFloatEquals(expected, actual, (float)0.0001);
+    }
+
+    public void assertFloatEquals(float expected, float actual, float range){
+        assertTrue(abs(expected-actual) < range);
+    }
+    @Test
+    public void P2PLine(){
+        Vector v1 = new Vector(10, 0);
+        Vector v2 = new Vector(10, 10);
+        Line line = new Line(v1, v2);
+
+        // make sure the line is pointing in the right direction
+        Vector lineDirection = v2.sub(v1);
+        assertFloatEquals(lineDirection.angleDiff(line.getDirection()), 0);
+
+        // make sure the line is the correct length
+        assertFloatEquals(lineDirection.mag(), line.getLength());
+
+        // make sure the line is starting in the correct place
+        assertFloatEquals(v1.x, line.getPosition().x);
+        assertFloatEquals(v1.y, line.getPosition().y);
+    }
+
+    @Test
+    public void bestFitLine(){
+        Vector v1 = new Vector(10, 0);
+        Vector v2 = new Vector(10, 10);
+        ArrayList<Vector> points = new ArrayList<>();
+        points.add(v1);
+        points.add(v2);
+        Line line = new Line(points);
+
+        // make sure the line is pointing in the right direction
+        Vector lineDirection = v2.sub(v1);
+        assertFloatEquals(lineDirection.angleDiff(line.getDirection()), 0);
+
+        // make sure the line is the correct length
+        assertFloatEquals(lineDirection.mag(), line.getLength());
+
+        // make sure the line is starting in the correct place
+        assertFloatEquals(v1.x, line.getPosition().x);
+        assertFloatEquals(v1.y, line.getPosition().y);
+    }
+
+}