add test for fields with different visibility

scope4j/src/test/java/org/extendj/FieldsTest.java

+package org.extendj;
+
+import org.extendj.ast.AbstractFinding;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import java.util.Set;
+
+public class FieldsTest extends ScopeAnalysisTest {
+
+  @Test
+  void test() {
+
+    ScopeAnalysis scopeAnalysis = new ScopeAnalysis();
+    Set<AbstractFinding> findings = scopeAnalysis.analyze("src/test/resources/fields", true, false);
+
+
+//    assertShadow(findings, "fieldC", 19, 3);
+//    assertShadow(findings, "fieldB", 21, 4);
+//    assertRedefinition(findings, "fieldB", 2);
+//    assertRedefinition(findings, "fieldB", 4);
+
+//    Assertions.assertEquals(4, findings.size());
+
+  }
+
+}

scope4j/src/test/resources/fields/ClassA.java

+public abstract class ClassA {
+​
+  public int publicField;
+  protected int protectedField;
+  int packageField;
+  private int privateField;
+
+  void n(int parameter) {
+    int member;
+    {
+      int memberInBlock;
+    }
+  }
+​
+}