Improve testing of double's

src/test/java/ExpressionTest.java

@@ -7,6 +7,8 @@ import static org.junit.jupiter.api.Assertions.*;
 // TODO: Write more tests
 public class ExpressionTest {
 
+    private static final double DELTA = 1e-15;
+
     @Test
     public void testAdditionOnNumbers0() {
         Expression expr = new Addition(new Number(4), new Number(3));
@@ -26,7 +28,7 @@ public class ExpressionTest {
         assertInstanceOf(Number.class, result);
 
         Number value = (Number) result;
-        assertEquals(14, value.getNumber());
+        assertEquals(14, value.getNumber(), DELTA);
     }
 
     @Test
@@ -52,7 +54,7 @@ public class ExpressionTest {
                 5, 7, 12, 5,
                 0, 7, 7, 15,
                 18, 14, 18, 14
-        }, resultMatrix.getElements());
+        }, resultMatrix.getElements(), DELTA);
     }
 
     @Test
@@ -63,7 +65,7 @@ public class ExpressionTest {
         assertInstanceOf(Number.class, result);
 
         Number value = (Number) result;
-        assertEquals(1, value.getNumber());
+        assertEquals(1, value.getNumber(), DELTA);
     }
 
     @Test
@@ -77,7 +79,7 @@ public class ExpressionTest {
         assertInstanceOf(Number.class, result);
 
         Number value = (Number) result;
-        assertEquals(-2, value.getNumber());
+        assertEquals(-2, value.getNumber(), DELTA);
     }
 
     @Test
@@ -93,7 +95,7 @@ public class ExpressionTest {
         assertInstanceOf(Number.class, result);
 
         Number value = (Number) result;
-        assertEquals(-6, value.getNumber());
+        assertEquals(-6, value.getNumber(), DELTA);
     }
 
     @Test
@@ -103,7 +105,7 @@ public class ExpressionTest {
 
         assertInstanceOf(Number.class, result);
         Number value = (Number) result;
-        assertEquals(12, value.getNumber());
+        assertEquals(12, value.getNumber(), DELTA);
     }
 
     @Test
@@ -113,7 +115,7 @@ public class ExpressionTest {
 
         assertInstanceOf(Number.class, result);
         Number value = (Number) result;
-        assertEquals(30, value.getNumber());
+        assertEquals(30, value.getNumber(), DELTA);
     }
 
     @Test
@@ -123,7 +125,7 @@ public class ExpressionTest {
 
         assertInstanceOf(Number.class, result);
         Number value = (Number) result;
-        assertEquals(2.5, value.getNumber());
+        assertEquals(2.5, value.getNumber(), DELTA);
     }
 
     @Test
@@ -134,7 +136,7 @@ public class ExpressionTest {
 
         assertInstanceOf(Number.class, result);
         Number value = (Number) result;
-        assertEquals(0.625, value.getNumber());
+        assertEquals(0.625, value.getNumber(), DELTA);
     }
 
     @Test
@@ -156,7 +158,7 @@ public class ExpressionTest {
                 2, 6, 10,
                 3, 7, 11,
                 4, 8, 12,
-        }, resultMatrix.getElements());
+        }, resultMatrix.getElements(), DELTA);
     }
 
     @Test
@@ -183,7 +185,7 @@ public class ExpressionTest {
                 22, 70, 118,
                 112, 248, 384,
                 73, 161, 249
-        }, resultMatrix.getElements());
+        }, resultMatrix.getElements(), DELTA);
     }
 
     @Test
@@ -204,7 +206,7 @@ public class ExpressionTest {
         assertInstanceOf(Number.class, result);
         Number value = (Number) result;
         double det = value.getNumber();
-        assertEquals(0, det);
+        assertEquals(0, det, DELTA);
     }
 
     @Test
@@ -226,6 +228,6 @@ public class ExpressionTest {
                 1, 0, 0,
                 0, 1, 0,
                 0, 0, 1
-        }, resultMatrix.getElements());
+        }, resultMatrix.getElements(), DELTA);
     }
 }

src/test/java/MatrixTest.java

@@ -4,13 +4,19 @@ import static org.junit.jupiter.api.Assertions.*;
 
 public class MatrixTest {
 
+    private static final double DELTA = 1e-15;
+
     @Test
     void testAddition() {
         Matrix a = new Matrix(3, 3, new double[]{1, 2, 3, 4, 5, 6, 7, 8, 9});
         Matrix b = new Matrix(3, 3, new double[]{1, 2, 3, 4, 5, 6, 7, 8, 9});
         a.add(b);
 
-        assertArrayEquals(new double[]{2, 4, 6, 8, 10, 12, 14, 16, 18}, a.getElements());
+        assertArrayEquals(new double[]{
+                2, 4, 6,
+                8, 10, 12,
+                14, 16, 18
+        }, a.getElements(), DELTA);
     }
 
     @Test
@@ -21,7 +27,12 @@ public class MatrixTest {
 
         assertEquals(4, a.getRows());
         assertEquals(4, a.getCols());
-        assertArrayEquals(new double[]{6, 6, 6, 6, 12, 12, 12, 12, 18, 18, 18, 18, 24, 24, 24, 24}, a.getElements());
+        assertArrayEquals(new double[]{
+                6, 6, 6, 6,
+                12, 12, 12, 12,
+                18, 18, 18, 18,
+                24, 24, 24, 24
+        }, a.getElements(), DELTA);
     }
 
     @Test
@@ -31,7 +42,12 @@ public class MatrixTest {
 
         assertEquals(4, a.getRows());
         assertEquals(3, a.getCols());
-        assertArrayEquals(new double[]{3, 3, 3, 6, 6, 6, 9, 9, 9, 12, 12, 12}, a.getElements());
+        assertArrayEquals(new double[]{
+                3, 3, 3,
+                6, 6, 6,
+                9, 9, 9,
+                12, 12, 12
+        }, a.getElements(), DELTA);
     }
 
     @Test
@@ -90,7 +106,8 @@ public class MatrixTest {
                 1, 5, 9,
                 2, 6, 4,
                 3, 7, 2,
-                4, 8, 1}, transpose.getElements());
+                4, 8, 1
+        }, transpose.getElements(), DELTA);
     }
 
     @Test