final Version Checker

.idea/libraries/jars.xml

+<component name="libraryTable">
+  <library name="jars">
+    <CLASSES>
+      <root url="jar://$PROJECT_DIR$/jars/junit-4.12.jar!/" />
+      <root url="jar://$PROJECT_DIR$/jars/hamcrest-core-1.3.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

.idea/modules.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/TriangleCheckerAssignment.iml" filepath="$PROJECT_DIR$/TriangleCheckerAssignment.iml" />
+    </modules>
+  </component>
+</project>

.idea/runConfigurations.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

.idea/vcs.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

TriangleCheckerAssignment.iml

+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="jars" level="project" />
+  </component>
+</module>

src/TriangleChecker.java

 import java.util.Scanner;
 
 public class TriangleChecker {
-  
+
   public enum TriangleType {
-    NONE, 
+    NONE,
     NORMAL,
     ISOSCELES,  // Gleichschenklig
     EQUILATERAL // Gleichseitig
   }
 
-
   public static void main(String[] args) {
     Scanner s = new Scanner(System.in);
     System.out.println("Geben Sie die Seitenlängen ein.");
     switch (type) {
       case NONE:
         System.out.println("Kein Dreieck");
-        break;        
+        break;
       case NORMAL:
         System.out.println("Dreieck");
-        break;        
+        break;
       case ISOSCELES:
         System.out.println("Gleichschenkliges Dreieck");
-        break;        
+        break;
       case EQUILATERAL:
         System.out.println("Gleichseitiges Dreieck");
-        break;        
+        break;
     }
   }
 
   // Analyse der Dreiecksart
   public static TriangleType checkTriangle(float a, float b, float c) {
+    //check for shape
+    if (a + b > c && a + c > b && b + c > a) {
+      if (a == b && b == c) {
+        //gleichseitiges Dreieck
+        return TriangleType.EQUILATERAL;
+      }
+      if (a == b || a == c || b == c) {
+        //gleichschenkliges Dreieck
+        return TriangleType.ISOSCELES;
+      }
+      //normales Dreieck
+      return TriangleType.NORMAL;
+    }
+    //kein Dreieck
     return TriangleType.NONE;
   }
 
-
 }

test/TriangleCheckerTest.java

         float c = 4;
 
         // Act
-        TriangleChecker.TriangleType type = TriangleChecker.checkTriangle(a, b, c);
+        TriangleChecker.TriangleType normal = TriangleChecker.checkTriangle(a, b, c);
 
         // Assert
-        assertEquals(TriangleChecker.TriangleType.NORMAL, type);
+        assertEquals(TriangleChecker.TriangleType.NORMAL, normal);
+
+        //Arrange
+        a = 1; b = 10; c = 1;
+
+        //Act
+        TriangleChecker.TriangleType none = TriangleChecker.checkTriangle(a, b, c);
+
+        //Assert
+        assertEquals(TriangleChecker.TriangleType.NONE, none);
+
+        //Arrange
+        a = 3; b = 3; c = 2;
+
+        //Act
+        TriangleChecker.TriangleType iso = TriangleChecker.checkTriangle(a, b, c);
+
+        //Assert
+        assertEquals(TriangleChecker.TriangleType.ISOSCELES, iso);
+
+        //Arrange
+        a = 4; b = 4; c = 4;
+
+        //Act
+        TriangleChecker.TriangleType equi = TriangleChecker.checkTriangle(a, b, c);
+
+        //Assert
+        assertEquals(TriangleChecker.TriangleType.EQUILATERAL, equi);
 
     }