added test for nested generic type

Author: Jolanrensen

core/generated-sources/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/TypeUtils.kt

@@ -74,6 +74,7 @@ internal fun KType.replaceGenericTypeParametersWithUpperbound(): KType {
                             (oldType.classifier as KTypeParameter).upperBounds.firstOrNull() ?: typeOf<Any?>()
 
                         // Type<in T> cannot be replaced with Type<Any?>, instead it should be replaced with Type<Nothing>
+                        // TODO: issue #471
                         IN -> nothingType(false)
                     }
                 }

core/generated-sources/src/test/kotlin/org/jetbrains/kotlinx/dataframe/types/UtilTests.kt

@@ -168,14 +168,18 @@ class UtilTests {
     interface TypeWithUpperbound1<T : UpperBound>
     interface TestType1<T : UpperBound> : TypeWithUpperbound1<T>
     interface TestTypeIn1<in T> : Comparable<T>
+    interface TestType2<S: UpperBound> : TestTypeIn1<TestType1<S>>
 
     @Test
-    fun eraseGenericTypeParameters() {
+    fun replaceGenericTypeParametersWithUpperbound() {
         val typeWithUpperboundT = TestType1::class.supertypes.first() // TypeWithUpperbound<T>
         typeWithUpperboundT.replaceGenericTypeParametersWithUpperbound() shouldBe typeOf<TypeWithUpperbound1<UpperBound>>()
 
         val comparableTypeT = TestTypeIn1::class.supertypes.first() // Comparable<T>
         comparableTypeT.replaceGenericTypeParametersWithUpperbound() shouldBe typeOf<Comparable<Nothing>>()
+
+        val nestedTypeWithUpperboundT = TestType2::class.supertypes.first() // TestTypeIn1<TestType1<S>>
+        nestedTypeWithUpperboundT.replaceGenericTypeParametersWithUpperbound() shouldBe typeOf<TestTypeIn1<TestType1<UpperBound>>>()
     }
 
     interface AbstractType<T>

core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/impl/TypeUtils.kt

@@ -74,6 +74,7 @@ internal fun KType.replaceGenericTypeParametersWithUpperbound(): KType {
                             (oldType.classifier as KTypeParameter).upperBounds.firstOrNull() ?: typeOf<Any?>()
 
                         // Type<in T> cannot be replaced with Type<Any?>, instead it should be replaced with Type<Nothing>
+                        // TODO: issue #471
                         IN -> nothingType(false)
                     }
                 }

core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/types/UtilTests.kt

@@ -168,14 +168,18 @@ class UtilTests {
     interface TypeWithUpperbound1<T : UpperBound>
     interface TestType1<T : UpperBound> : TypeWithUpperbound1<T>
     interface TestTypeIn1<in T> : Comparable<T>
+    interface TestType2<S: UpperBound> : TestTypeIn1<TestType1<S>>
 
     @Test
-    fun eraseGenericTypeParameters() {
+    fun replaceGenericTypeParametersWithUpperbound() {
         val typeWithUpperboundT = TestType1::class.supertypes.first() // TypeWithUpperbound<T>
         typeWithUpperboundT.replaceGenericTypeParametersWithUpperbound() shouldBe typeOf<TypeWithUpperbound1<UpperBound>>()
 
         val comparableTypeT = TestTypeIn1::class.supertypes.first() // Comparable<T>
         comparableTypeT.replaceGenericTypeParametersWithUpperbound() shouldBe typeOf<Comparable<Nothing>>()
+
+        val nestedTypeWithUpperboundT = TestType2::class.supertypes.first() // TestTypeIn1<TestType1<S>>
+        nestedTypeWithUpperboundT.replaceGenericTypeParametersWithUpperbound() shouldBe typeOf<TestTypeIn1<TestType1<UpperBound>>>()
     }
 
     interface AbstractType<T>