Complex

.classpath

@@ -2,5 +2,6 @@
 <classpath>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/5"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>

src/Complex.java

+
+public class Complex {
+
+	public Complex(double d, double e) {
+		// TODO Auto-generated constructor stub
+	}
+
+	public double real() {
+		// TODO Auto-generated method stub
+		return 0;
+	}
+
+	public double imag() {
+		// TODO Auto-generated method stub
+		return 0;
+	}
+
+	public double magnitude() {
+		// TODO Auto-generated method stub
+		return 0;
+	}
+
+	public double argument() {
+		// TODO Auto-generated method stub
+		return 0;
+	}
+
+	public Complex add(Complex b) {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
+}
+

src/ComplexTest.java

+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class ComplexTest {
+
+    @Test
+    void testBasic() {
+        /* 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(0, 0);
+        assertEquals(0, b.real(), 1e-6);
+        assertEquals(0, b.imag(), 1e-6);
+    }
+    
+    @Test
+    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
+    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
+    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);
+    }
+    
+    @Test
+    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());
+    }
+}