test: characterize microblock recipes

src/test/java/codechicken/microblock/MicroRecipeBinaryCompatibilityTest.java

@@ -0,0 +1,84 @@
+package codechicken.microblock;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Arrays;
+import java.util.Set;
+import java.util.TreeSet;
+
+import org.junit.jupiter.api.Test;
+
+class MicroRecipeBinaryCompatibilityTest {
+
+    @Test
+    void staticFacadeAndCompanionKeepTheirCompletePublishedShape() throws Exception {
+        Set<String> expected = new TreeSet<>(
+                Arrays.asList(
+                        "canCut(codechicken.microblock.Saw,net.minecraft.item.ItemStack,int)boolean",
+                        "create(int,int,int,int)net.minecraft.item.ItemStack",
+                        "findMaterial(net.minecraft.item.ItemStack)int",
+                        "getCraftingResult(net.minecraft.inventory.InventoryCrafting)net.minecraft.item.ItemStack",
+                        "getGluingResult(net.minecraft.inventory.InventoryCrafting)net.minecraft.item.ItemStack",
+                        "getHollowFillResult(net.minecraft.inventory.InventoryCrafting)net.minecraft.item.ItemStack",
+                        "getHollowResult(net.minecraft.inventory.InventoryCrafting)net.minecraft.item.ItemStack",
+                        "getRecipeOutput()net.minecraft.item.ItemStack",
+                        "getRecipeSize()int",
+                        "getSaw(net.minecraft.inventory.InventoryCrafting)scala.Tuple3",
+                        "getSplittingResult(net.minecraft.inventory.InventoryCrafting)net.minecraft.item.ItemStack",
+                        "getThinningResult(net.minecraft.inventory.InventoryCrafting)net.minecraft.item.ItemStack",
+                        "matches(net.minecraft.inventory.InventoryCrafting,net.minecraft.world.World)boolean",
+                        "microClass(net.minecraft.item.ItemStack)int",
+                        "microMaterial(net.minecraft.item.ItemStack)int",
+                        "microSize(net.minecraft.item.ItemStack)int",
+                        "splitMap()scala.collection.immutable.Map"));
+
+        assertEquals(expected, publicSignatures(MicroRecipe.class, true));
+        assertEquals(expected, publicSignatures(MicroRecipe$.class, false));
+        assertTrue(Modifier.isFinal(MicroRecipe.class.getModifiers()));
+        assertTrue(Modifier.isFinal(MicroRecipe$.class.getModifiers()));
+
+        Field module = MicroRecipe$.class.getField("MODULE$");
+        assertSame(MicroRecipe$.class, module.getType());
+        assertTrue(Modifier.isStatic(module.getModifiers()));
+        assertTrue(Modifier.isFinal(module.getModifiers()));
+        assertSame(MicroRecipe$.MODULE$, module.get(null));
+    }
+
+    @Test
+    void splittingMapKeepsScalaTypeValuesAndFacadeIdentity() {
+        assertSame(MicroRecipe$.MODULE$.splitMap(), MicroRecipe.splitMap());
+        assertEquals(3, ((Number) MicroRecipe.splitMap().apply(0)).intValue());
+        assertEquals(3, ((Number) MicroRecipe.splitMap().apply(1)).intValue());
+        assertEquals(2, ((Number) MicroRecipe.splitMap().apply(3)).intValue());
+        assertEquals(3, MicroRecipe.splitMap().size());
+    }
+
+    private static Set<String> publicSignatures(Class<?> type, boolean requireStatic) {
+        Set<String> signatures = new TreeSet<>();
+        for (Method method : type.getDeclaredMethods()) {
+            if (!Modifier.isPublic(method.getModifiers())) {
+                continue;
+            }
+            assertEquals(requireStatic, Modifier.isStatic(method.getModifiers()), method.toString());
+            signatures.add(signature(method));
+        }
+        return signatures;
+    }
+
+    private static String signature(Method method) {
+        StringBuilder out = new StringBuilder(method.getName()).append('(');
+        Class<?>[] parameters = method.getParameterTypes();
+        for (int i = 0; i < parameters.length; i++) {
+            if (i > 0) {
+                out.append(',');
+            }
+            out.append(parameters[i].getName());
+        }
+        return out.append(')').append(method.getReturnType().getName()).toString();
+    }
+}