Remove imports from default package (#338)

Author: Nikita Vlaev

utbot-framework-api/src/main/kotlin/org/utbot/framework/plugin/api/Api.kt

@@ -653,6 +653,9 @@ open class ClassId(
 
     open val packageName: String get() = jClass.`package`?.name ?: "" // empty package for primitives
 
+    open val isInDefaultPackage: Boolean
+        get() = packageName.isEmpty()
+
     open val isPublic: Boolean
         get() = Modifier.isPublic(jClass.modifiers)
 

utbot-framework/src/main/kotlin/org/utbot/framework/codegen/model/constructor/util/ConstructorUtils.kt

@@ -169,6 +169,8 @@ internal fun CgContextOwner.importIfNeeded(type: ClassId) {
         .takeIf { (it.isRefType && it.packageName != testClassPackageName && it.packageName != "java.lang") || it.isNested }
         // we cannot import inaccessible classes (builtin classes like JUnit are accessible here because they are public)
         ?.takeIf { it.isAccessibleFrom(testClassPackageName) }
+        // don't import classes from default package
+        ?.takeIf { !it.isInDefaultPackage }
         // cannot import anonymous classes
         ?.takeIf { !it.isAnonymous }
         // do not import if there is a simple name clash