Correct accessibily for package-private fields #1667 (#1685)

Author: EgorkaKulikov

utbot-framework/src/main/kotlin/org/utbot/framework/codegen/tree/CgMethodConstructor.kt

@@ -151,6 +151,7 @@ import org.utbot.framework.plugin.api.util.doubleStreamClassId
 import org.utbot.framework.plugin.api.util.doubleStreamToArrayMethodId
 import org.utbot.framework.plugin.api.util.intStreamClassId
 import org.utbot.framework.plugin.api.util.intStreamToArrayMethodId
+import org.utbot.framework.plugin.api.util.isPackagePrivate
 import org.utbot.framework.plugin.api.util.isSubtypeOf
 import org.utbot.framework.plugin.api.util.longStreamClassId
 import org.utbot.framework.plugin.api.util.longStreamToArrayMethodId
@@ -1112,7 +1113,11 @@ open class CgMethodConstructor(val context: CgContext) : CgContextOwner by conte
     private fun FieldId.getAccessExpression(variable: CgVariable): CgExpression =
         // Can directly access field only if it is declared in variable class (or in its ancestors)
         // and is accessible from current package
-        if (variable.type.hasField(this) && canBeReadFrom(context)) {
+        if (variable.type.hasField(this)
+            //TODO: think about moving variable type checks into [isAccessibleFrom] after contest
+            && (!isPackagePrivate || variable.type.packageName == context.testClassPackageName)
+            && canBeReadFrom(context)
+        ) {
             if (jField.isStatic) CgStaticFieldAccess(this) else CgFieldAccess(variable, this)
         } else {
             utilsClassId[getFieldValue](variable, this.declaringClass.name, this.name)