Dicing things up a little

- Trying to slim this beauty down to a size 6.
- Shes a size 7.1

buildSrc/src/test/java/ClassReferencesTest.java

@@ -0,0 +1,55 @@
+import org.junit.Test;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
+
+import java.util.Set;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class ClassReferencesTest {
+    @Test
+    public void includesDeclarationOnlyFieldAndMethodTypes() {
+        ClassWriter writer = createClass();
+        writer.visitField(Opcodes.ACC_PUBLIC, "field", "[[Lexample/FieldType;", null, null).visitEnd();
+        writer.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_ABSTRACT, "method",
+                "(Lexample/Argument;[I)[Lexample/Result;", null, null).visitEnd();
+        writer.visitEnd();
+
+        Set<String> references = ClassReferences.read(writer.toByteArray());
+        assertTrue(references.containsAll(Set.of("example/FieldType", "example/Argument", "example/Result")));
+        assertFalse(references.contains("I"));
+    }
+
+    @Test
+    public void includesMemberReferenceAndMethodTypeDescriptors() {
+        ClassWriter writer = createClass();
+        writer.newMethod("example/Owner", "method", "(Lexample/Argument;)Lexample/Result;", false);
+        writer.newConst(Type.getMethodType("(Lexample/HandleArgument;)Lexample/HandleResult;"));
+        writer.visitEnd();
+
+        Set<String> references = ClassReferences.read(writer.toByteArray());
+        assertTrue(references.containsAll(Set.of("example/Owner", "example/Argument", "example/Result",
+                "example/HandleArgument", "example/HandleResult")));
+    }
+
+    @Test
+    public void doesNotTreatStringsOrAnnotationOnlyTypesAsLinkage() {
+        ClassWriter writer = createClass();
+        writer.newConst("Lexample/StringValue;");
+        writer.visitAnnotation("Lexample/Annotation;", true).visitEnd();
+        writer.visitEnd();
+
+        Set<String> references = ClassReferences.read(writer.toByteArray());
+        assertFalse(references.contains("example/StringValue"));
+        assertFalse(references.contains("example/Annotation"));
+    }
+
+    private static ClassWriter createClass() {
+        ClassWriter writer = new ClassWriter(0);
+        writer.visit(Opcodes.V25, Opcodes.ACC_PUBLIC | Opcodes.ACC_ABSTRACT,
+                "example/Consumer", null, "java/lang/Object", null);
+        return writer;
+    }
+}