test:

- Added ContinentGeneratorTest checking the continent map at world start

Ref.: https://github.com/VolmitSoftware/Iris/issues/1251

core/src/test/java/art/arcane/iris/generation/terrain/ContinentGeneratorTest.java

@@ -0,0 +1,65 @@
+package art.arcane.iris.generation.terrain;
+
+import art.arcane.iris.generation.noise.IrisGeneratorStyle;
+import art.arcane.iris.generation.noise.NoiseStyle;
+import art.arcane.iris.generation.runtime.Engine;
+import art.arcane.iris.pack.loading.IrisData;
+import art.arcane.volmlib.util.math.RNG;
+import art.arcane.volmlib.util.noise.CNG;
+import org.junit.Test;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public class ContinentGeneratorTest {
+    private static final long WORLD_SEED = 7L;
+    private static final double POWER_OF_TWO_CONTINENT_ZOOM = 4D;
+    private static final double[][] SAMPLE_BLOCKS = {{1000D, -2000D}, {12.5D, -7.25D}, {-517D, 333D}};
+    private static final double[] CONTINENT_MAP_OF_EXISTING_WORLDS =
+            {0.21889892332042843D, 0.6984934456740721D, 0.2708759584352327D};
+
+    private final IrisData packData = createPackDataThatBelongsToOneRunningEngine();
+    private final IrisDimension baseZoomDimension = createDimensionWithContinentZoom(POWER_OF_TWO_CONTINENT_ZOOM);
+
+    @Test
+    public void doesTheContinentMapAtWorldStartMatchExistingWorlds() {
+        assertArrayEquals(CONTINENT_MAP_OF_EXISTING_WORLDS, sampleContinentMapAtWorldStart(baseZoomDimension), 0D);
+    }
+
+    private double[] sampleContinentMapAtWorldStart(IrisDimension dimension) {
+        return sampleContinentMap(dimension, SAMPLE_BLOCKS);
+    }
+
+    private double[] sampleContinentMap(IrisDimension dimension, double[][] blocks) {
+        return sampleAtBlocks(ContinentGenerator.create(dimension, new RNG(WORLD_SEED), packData), blocks);
+    }
+
+    private static double[] sampleAtBlocks(CNG continentGenerator, double[][] blocks) {
+        return Arrays.stream(blocks).mapToDouble(block -> sampleAt(continentGenerator, block)).toArray();
+    }
+
+    private static double sampleAt(CNG continentGenerator, double[] block) {
+        return continentGenerator.noise(block[0], block[1]);
+    }
+
+    private static IrisDimension createDimensionWithContinentZoom(double zoom) {
+        return new IrisDimension().setContinentalStyle(createSimplexStyle()).setContinentZoom(zoom);
+    }
+
+    private static IrisGeneratorStyle createSimplexStyle() {
+        return new IrisGeneratorStyle(NoiseStyle.SIMPLEX);
+    }
+
+    private static IrisData createPackDataThatBelongsToOneRunningEngine() {
+        IrisData newPackData = mock(IrisData.class);
+        bindToNewRunningEngine(newPackData);
+        return newPackData;
+    }
+
+    private static void bindToNewRunningEngine(IrisData packData) {
+        when(packData.getEngine()).thenReturn(mock(Engine.class));
+    }
+}