diff --git a/src/test/java/schule/ngb/zm/util/NoiseTest.java b/src/test/java/schule/ngb/zm/util/NoiseTest.java
index 5488b57..a92a0e1 100644
--- a/src/test/java/schule/ngb/zm/util/NoiseTest.java
+++ b/src/test/java/schule/ngb/zm/util/NoiseTest.java
@@ -1,4 +1,126 @@
+package schule.ngb.zm.util;
+
+import org.junit.jupiter.api.Test;
+
 import static org.junit.jupiter.api.Assertions.*;
+
 class NoiseTest {
 
+	@Test
+	void noise() {
+		int N = 1000;
+
+		Noise perlin = new Noise();
+		Noise perlin1 = new Noise(1001);
+		Noise perlin2 = new Noise(2002);
+		Noise perlin3 = new Noise(2002);
+
+		int pp1 = 0, p1p2 = 0;
+		for( int i = 1; i < N; i++ ) {
+			double x = i * 0.005;
+
+			assertInRange(perlin.noise(x));
+			assertInRange(perlin1.noise(x));
+			assertInRange(perlin2.noise(x));
+			if( perlin.noise(x) == perlin1.noise(x) ) {
+				pp1++;
+			}
+			if( perlin1.noise(x) == perlin2.noise(x) ) {
+				p1p2++;
+			}
+			assertEquals(perlin2.noise(x), perlin3.noise(x), "perlin2 and perlin3 should be equal for input " + x);
+		}
+		assertTrue(pp1 < N * 0.75, "perlin and perlin1 should not be equal more than 75% (was " + pp1 / 1000.0 + ")");
+		assertTrue(p1p2 < N * 0.75, "perlin1 and perlin2 should not be equal more than 75% (was " + p1p2 / 1000.0 + ")");
+	}
+
+	private void assertInRange( double d ) {
+		assertTrue(0.0 <= d && 1.0 >= d);
+	}
+
+	private void assertInRange( double d, double min, double max ) {
+		assertTrue(min <= d && max >= d);
+	}
+
+	@Test
+	void noise2d() {
+		int N = 100;
+
+		Noise perlin = new Noise();
+		Noise perlin1 = new Noise(1001);
+		Noise perlin2 = new Noise(2002);
+		Noise perlin3 = new Noise(2002);
+
+		int pp1 = 0, p1p2 = 0;
+		for( int i = 1; i < N; i++ ) {
+			for( int j = 0; j < N; j++ ) {
+				double x = i * 0.005;
+				double y = j * 0.001;
+
+				assertInRange(perlin.noise(x, y));
+				assertInRange(perlin1.noise(x, y));
+				assertInRange(perlin2.noise(x, y));
+				if( perlin.noise(x, y) == perlin1.noise(x, y) ) {
+					pp1++;
+				}
+				if( perlin1.noise(x, y) == perlin2.noise(x, y) ) {
+					p1p2++;
+				}
+				assertEquals(perlin2.noise(x, y), perlin3.noise(x, y), "perlin2 and perlin3 should be equal for input " + x + "," + y);
+			}
+		}
+		assertTrue(pp1 < N * N * 0.75, "perlin and perlin1 should not be equal more than 75% (was " + (pp1 / 1.0 * N * N) + ")");
+		assertTrue(p1p2 < N * N * 0.75, "perlin1 and perlin2 should not be equal more than 75% (was " + (p1p2 / 1.0 * N * N) + ")");
+	}
+
+	@Test
+	void noise3d() {
+		int N = 100;
+
+		Noise perlin = new Noise();
+		Noise perlin1 = new Noise(1001);
+		Noise perlin2 = new Noise(2002);
+		Noise perlin3 = new Noise(2002);
+
+		int pp1 = 0, p1p2 = 0;
+		for( int i = 1; i < N; i++ ) {
+			for( int j = 0; j < N; j++ ) {
+				for( int k = 0; k < N; k++ ) {
+					double x = i * 0.005;
+					double y = j * 0.001;
+					double z = k * 0.004;
+
+					assertInRange(perlin.noise(x, y, z));
+					assertInRange(perlin1.noise(x, y, z));
+					assertInRange(perlin2.noise(x, y, z));
+					if( perlin.noise(x, y, z) == perlin1.noise(x, y, z) ) {
+						pp1++;
+					}
+					if( perlin1.noise(x, y, z) == perlin2.noise(x, y, z) ) {
+						p1p2++;
+					}
+					assertEquals(perlin2.noise(x, y, z), perlin3.noise(x, y, z), "perlin2 and perlin3 should be equal for input " + x + "," + y);
+				}
+			}
+		}
+		assertTrue(pp1 < N * N * N* 0.75, "perlin and perlin1 should not be equal more than 75% (was " + (pp1 / 1.0 * N * N * N) + ")");
+		assertTrue(p1p2 < N * N * N * 0.75, "perlin1 and perlin2 should not be equal more than 75% (was " + (p1p2 / 1.0 * N * N * N) + ")");
+	}
+
+	@Test
+	void range() {
+		Noise perlin = new Noise(1001);
+		perlin.setRange(100, 255);
+
+		for( int i = 0; i < 1000; i++ ) {
+			assertInRange(perlin.noise(i * 0.005), 100, 255);
+		}
+
+		perlin.setRange(-100, 100);
+
+		for( int i = 0; i < 1000; i++ ) {
+			assertInRange(perlin.noise(i * 0.005), -100, 100);
+		}
+	}
+
 }