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Java Resit/assesment/Class Exercises/Complex Numbers/javaassesex1/src/AppTest.java

+import static org.junit.Assert.assertEquals;
+import org.junit.Test;
+
+public class AppTest {
+
+  @Test
+  public void testConstructor() {
+      /* Constructor should put the first parameter as the real part and second as the imaginary part.
+       * real() should return real part, imag() imaginary part.
+       */
+      Complex a = new Complex(4.2, 5.7);
+      assertEquals(4.2, a.real(), 1e-6);
+      assertEquals(5.7, a.imag(), 1e-6);
+      Complex b = new Complex();
+      assertEquals(0, b.real(), 1e-6);
+      assertEquals(0, b.imag(), 1e-6);
+  }
+
+  @Test
+  public void testMagnitude() {
+      /* magnitude() should return the magnitude of the complex number */
+      Complex a = new Complex(9.6, 11.5);
+      assertEquals(14.98032042, a.magnitude(), 1e-6);
+  }
+  
+  @Test
+  public void testArgument() {
+      /* argument() should return the argument of the complex number */
+      Complex a = new Complex(9.6, 11.5);
+      assertEquals(0.87520335, a.argument(), 1e-6);
+  }
+  
+
+  @Test
+  public void testToString() {
+      /* toString() should return a string like 1.2 + j3.4 where 1.2 is the real part
+       * and 3.4 the imaginary part.
+       */
+      Complex a = new Complex(1.2, 3.4);
+      assertEquals("1.2 + j3.4", a.toString());
+      Complex b = new Complex(1.2, 0.0);
+      assertEquals("1.2", b.toString());
+      Complex c = new Complex(0.0, 9.3);
+      assertEquals("j9.3", c.toString());
+      Complex d = new Complex(1.2, -3.4);
+      assertEquals("1.2 - j3.4", d.toString());
+  }  
+
+  @Test
+  public void testAdd() {
+      /* add() should return a new complex number which is the sum of this and the parameter */
+      Complex a = new Complex(6.6, 12.9);
+      Complex b = new Complex(13.1, 13.5);
+      Complex c = a.add(b);
+      assertEquals(19.7, c.real(), 1e-6);
+      assertEquals(26.4, c.imag(), 1e-6);
+  }
+  
+
+}