From e8dfdfd5c93e599b56cf9fa0353054461f7a636c Mon Sep 17 00:00:00 2001
From: Lukas Reichwein <lukas.reichwein@informatik.hs-fulda.de>
Date: Tue, 16 Jul 2019 18:40:13 +0200
Subject: [PATCH] Added conjugationOf to the ComplexNumber object

---
 .../ugsbo/complexnumcalc/ComplexNumber.java   | 14 ++++++++++++
 .../conjugationOfComplexNumbersTest.java      | 22 +++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 src/test/java/com/ugsbo/complexnumcalc/conjugationOfComplexNumbersTest.java

diff --git a/src/main/java/com/ugsbo/complexnumcalc/ComplexNumber.java b/src/main/java/com/ugsbo/complexnumcalc/ComplexNumber.java
index ca5fddc..ade991d 100644
--- a/src/main/java/com/ugsbo/complexnumcalc/ComplexNumber.java
+++ b/src/main/java/com/ugsbo/complexnumcalc/ComplexNumber.java
@@ -137,4 +137,18 @@ public class ComplexNumber {
         return absoluteValue;
     }
 
+    /**
+     * Calucates the absolute value of this complex number
+     * @return the absolute value
+     */
+    public ComplexNumber conjugationOf(){
+        if(this.imaginaryPart.equals(Double.valueOf(0))){
+            return this;
+        } else {
+            this.imaginaryPart *= (-1);
+            return this;
+        }
+        
+    }
+
 }
\ No newline at end of file
diff --git a/src/test/java/com/ugsbo/complexnumcalc/conjugationOfComplexNumbersTest.java b/src/test/java/com/ugsbo/complexnumcalc/conjugationOfComplexNumbersTest.java
new file mode 100644
index 0000000..e996959
--- /dev/null
+++ b/src/test/java/com/ugsbo/complexnumcalc/conjugationOfComplexNumbersTest.java
@@ -0,0 +1,22 @@
+package com.ugsbo.complexnumcalc;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class conjugationOfComplexNumbersTest {
+
+    @Test
+    public void TheConjugatedComplexNumberOfAComplexNumberWithOnlyARealPartShouldBeTheRealPart_ButItIsNot() { 
+        Double realPart = Double.valueOf(4);
+        Double imaginaryPart = Double.valueOf(0);
+        ComplexNumber complexNumber = new ComplexNumber(realPart, imaginaryPart);
+        ComplexNumber expected = new ComplexNumber(realPart, imaginaryPart);
+        
+        ComplexNumber actual = complexNumber.conjugationOf();
+
+        assertTrue("TheConjugatedComplexNumberOfAComplexNumberWithOnlyARealPartIsTheRealPart", expected.equals(actual));
+        //TODO change equals to equalTo
+        //assertThat("TheConjugatedComplexNumberOfAComplexNumberWithOnlyARealPartIsTheRealPart", expected, equalsTo(actual));
+    }
+}
\ No newline at end of file