diff --git a/Prog3_A_Prak.iml b/Prog3_A_Prak.iml
index c90834f..5dfd50f 100644
--- a/Prog3_A_Prak.iml
+++ b/Prog3_A_Prak.iml
@@ -4,8 +4,10 @@
     <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="junit.jupiter" level="project" />
   </component>
 </module>
\ No newline at end of file
diff --git a/src/Prak1/zahlenfilterNeu.java b/src/Prak1/zahlenfilterNeu.java
new file mode 100644
index 0000000..2a46abe
--- /dev/null
+++ b/src/Prak1/zahlenfilterNeu.java
@@ -0,0 +1,42 @@
+package Prak1;
+
+public class zahlenfilterNeu {
+
+    public static void main(String[] args) {
+        printNumbers();
+    }
+    private static void printNumbers(){
+        int grenze = 20;
+        int i;
+        for (i=1; i<=grenze; i++){
+            if(filter(i)){
+                System.out.println(i);
+            }
+        }
+    }
+    public static boolean filter(int i){
+    return !(durch5teilbar(i) || endetMit9(i) || summeDurch3(i));
+}
+    public static boolean durch5teilbar(int i) {
+        if (i % 5 == 0) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+    public static boolean endetMit9(int i) {
+        if (i % 10 == 9) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+    public static boolean summeDurch3(int i) {
+        int x = i + (i - 1);
+        if (x % 3 == 0) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+}
\ No newline at end of file
diff --git a/test/Prak1/TriangleCheckerTest.java b/test/Prak1/TriangleCheckerTest.java
new file mode 100644
index 0000000..f02485a
--- /dev/null
+++ b/test/Prak1/TriangleCheckerTest.java
@@ -0,0 +1,13 @@
+package Prak1;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class TriangleCheckerTest {
+
+    @Test
+    void checkTriangle_Normal   () {
+        assertEquals(TriangleChecker.TriangleType.NORMAL, TriangleChecker.checkTriangle(15, 12, 22));
+    }
+}
\ No newline at end of file
diff --git a/test/Prak1/zahlenfilterNeuTest.java b/test/Prak1/zahlenfilterNeuTest.java
new file mode 100644
index 0000000..198302e
--- /dev/null
+++ b/test/Prak1/zahlenfilterNeuTest.java
@@ -0,0 +1,36 @@
+package Prak1;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class zahlenfilterNeuTest {
+
+    @Test
+    void filter() {
+        assertTrue(zahlenfilterNeu.filter(3));
+        assertTrue(zahlenfilterNeu.filter(7));
+        assertFalse(zahlenfilterNeu.filter(10));
+    }
+
+    @Test
+    void durch5teilbar() {
+        assertTrue(zahlenfilterNeu.durch5teilbar(15));
+        assertTrue(zahlenfilterNeu.durch5teilbar(20));
+        assertFalse(zahlenfilterNeu.durch5teilbar(27));
+    }
+
+    @Test
+    void endetMit9() {
+        assertTrue(zahlenfilterNeu.endetMit9(9));
+        assertTrue(zahlenfilterNeu.endetMit9(19));
+        assertFalse(zahlenfilterNeu.endetMit9(15));
+    }
+
+    @Test
+    void summeDurch3() {
+        assertTrue(zahlenfilterNeu.summeDurch3(5));
+        assertTrue(zahlenfilterNeu.summeDurch3(8));
+        assertFalse(zahlenfilterNeu.summeDurch3(7));
+    }
+}
\ No newline at end of file