Add unit tests for spatial indexing and random number generation utilities

2025-12-21 23:47:14 +01:00
parent 5470c3a180
commit bcf44bb8e2
7 changed files with 923 additions and 0 deletions
--- a/src/test/java/de/extio/game_engine/util/rng/JavaReferenceRandomTests.java
+++ b/src/test/java/de/extio/game_engine/util/rng/JavaReferenceRandomTests.java
@@ -0,0 +1,54 @@
+/* Copyright (C) 2023 Stephan Birkl - All Rights Reserved.
+ * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 
+ * OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package de.extio.game_engine.util.rng;
+
+import java.util.Random;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+public class JavaReferenceRandomTests {
+	
+	@Disabled
+	@Test
+	public void testReferenceRandom() {
+		final Random random = new Random(42);
+		
+		System.out.println("nextDouble()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextDouble());
+		}
+		System.out.println("nextInt()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextInt());
+		}
+		System.out.println("nextInt(5)");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextInt(5));
+		}
+		System.out.println("nextLong()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextLong());
+		}
+		System.out.println("nextBoolean()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextBoolean());
+		}
+		
+		System.out.println();
+		System.out.println("Performance:");
+		final long start = System.currentTimeMillis();
+		long a = 5;
+		for (int i = 0; i < 1000000000; i++) {
+			a = a + random.nextLong();
+		}
+		System.out.println(a + " " + (System.currentTimeMillis() - start));
+	}
+	
+}
--- a/src/test/java/de/extio/game_engine/util/rng/JavaThreadLocalRandomTests.java
+++ b/src/test/java/de/extio/game_engine/util/rng/JavaThreadLocalRandomTests.java
@@ -0,0 +1,62 @@
+/* Copyright (C) 2023 Stephan Birkl - All Rights Reserved.
+ * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 
+ * OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package de.extio.game_engine.util.rng;
+
+import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
+
+import org.junit.jupiter.api.Test;
+
+public class JavaThreadLocalRandomTests {
+	
+	@Test
+	public void testReferenceRandom() {
+		final Random random = ThreadLocalRandom.current();
+		
+		System.out.println("nextDouble()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextDouble());
+		}
+		System.out.println("nextInt()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextInt());
+		}
+		System.out.println("nextInt(5)");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextInt(5));
+		}
+		System.out.println("nextLong()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextLong());
+		}
+		System.out.println("nextBoolean()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextBoolean());
+		}
+		
+		System.out.println();
+		System.out.println("Performance longs:");
+		long start = System.currentTimeMillis();
+		long a = 5;
+		for (int i = 0; i < 1000000000; i++) {
+			a = a + random.nextLong();
+		}
+		System.out.println(a + " " + (System.currentTimeMillis() - start));
+		
+		System.out.println();
+		System.out.println("Performance ints:");
+		start = System.currentTimeMillis();
+		int b = 5;
+		for (int i = 0; i < 1000000000; i++) {
+			b = b + random.nextInt();
+		}
+		System.out.println(b + " " + (System.currentTimeMillis() - start));
+	}
+	
+}
--- a/src/test/java/de/extio/game_engine/util/rng/XorShift128RandomTests.java
+++ b/src/test/java/de/extio/game_engine/util/rng/XorShift128RandomTests.java
@@ -0,0 +1,101 @@
+/* Copyright (C) 2023 Stephan Birkl - All Rights Reserved.
+ * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 
+ * OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package de.extio.game_engine.util.rng;
+
+import java.util.Random;
+
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+public class XorShift128RandomTests {
+	
+	@Test
+	public void testXorShift128Random() {
+		final Random random = new XorShift128Random(42);
+		
+		System.out.println("nextDouble()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextDouble());
+		}
+		System.out.println("nextInt()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextInt());
+		}
+		System.out.println("nextInt(5)");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextInt(5));
+		}
+		System.out.println("nextLong()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextLong());
+		}
+		System.out.println("nextBoolean()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextBoolean());
+		}
+		
+		System.out.println();
+		System.out.println("Performance longs:");
+		long start = System.currentTimeMillis();
+		long a = 5;
+		for (int i = 0; i < 1000000000; i++) {
+			a = a + random.nextLong();
+		}
+		System.out.println(a + " " + (System.currentTimeMillis() - start));
+		
+		System.out.println();
+		System.out.println("Performance ints:");
+		start = System.currentTimeMillis();
+		int b = 5;
+		for (int i = 0; i < 1000000000; i++) {
+			b = b + random.nextInt();
+		}
+		System.out.println(b + " " + (System.currentTimeMillis() - start));
+	}
+	
+	@Test
+	public void testXorShift128RandomSeed0() {
+		final Random random = new XorShift128Random(0);
+		
+		System.out.println("nextDouble()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(random.nextDouble());
+		}
+	}
+	
+	@Test
+	public void testXorShift128RandomIntRange() {
+		final Random random = new XorShift128Random(777);
+		
+		for (int i = 1; i < 10; i++) {
+			for (int ii = 0; ii < 10; ii++) {
+				System.out.println(i + " " + ii + " random.nextInt(i): " + random.nextInt(i));
+			}
+		}
+	}
+	
+	@Test
+	@Disabled
+	public void testXorShift128RandomDoubleRange() {
+		final Random random = new XorShift128Random();
+		
+		final int[] buckets = new int[1000];
+		
+		for (int i = 0; i < 1000000; i++) {
+			final double n = random.nextDouble();
+			final int bucket = (int) Math.floor(n / 0.001);
+			buckets[bucket]++;
+		}
+		
+		for (int i = 0; i < 1000; i++) {
+			System.out.println(String.format("%03d", i) + " " + buckets[i]);
+		}
+	}
+	
+}
--- a/src/test/java/de/extio/game_engine/util/rng/ZeroRandomTests.java
+++ b/src/test/java/de/extio/game_engine/util/rng/ZeroRandomTests.java
@@ -0,0 +1,52 @@
+/* Copyright (C) 2023 Stephan Birkl - All Rights Reserved.
+ * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR 
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE 
+ * OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package de.extio.game_engine.util.rng;
+
+import java.util.Random;
+
+import org.junit.jupiter.api.Test;
+
+public class ZeroRandomTests {
+	
+	@Test
+	public void testSpeedRunRandom() {
+		final Random speedRunRandom = new ZeroRandom();
+		
+		System.out.println("nextDouble()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(speedRunRandom.nextDouble());
+		}
+		System.out.println("nextInt()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(speedRunRandom.nextInt());
+		}
+		System.out.println("nextInt(5)");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(speedRunRandom.nextInt(5));
+		}
+		System.out.println("nextLong()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(speedRunRandom.nextLong());
+		}
+		System.out.println("nextBoolean()");
+		for (int i = 0; i < 10; i++) {
+			System.out.println(speedRunRandom.nextBoolean());
+		}
+		
+		System.out.println();
+		System.out.println("Performance:");
+		final long start = System.currentTimeMillis();
+		long a = 5;
+		for (int i = 0; i < 1000000000; i++) {
+			a = a + speedRunRandom.nextLong();
+		}
+		System.out.println(a + " " + (System.currentTimeMillis() - start));
+	}
+	
+}