added List.toDataFrame() test with local class

Author: Jolanrensen

core/src/test/kotlin/org/jetbrains/kotlinx/dataframe/api/constructors.kt

@@ -38,6 +38,7 @@ class ConstructorsTests {
     @Suppress("ktlint:standard:argument-list-wrapping")
     @Test
     fun `dataFrameOf with local class`() {
+        // issue #928
         data class Car(val type: String, val model: String)
 
         val cars: DataFrame<*> = dataFrameOf("owner", "car")(
@@ -50,5 +51,13 @@ class ConstructorsTests {
         val unfolded = cars.unfold("car")
         unfolded["car"]["type"].type shouldBe typeOf<String>()
         unfolded["car"]["model"].type shouldBe typeOf<String>()
+
+        val cars2 = listOf(
+            Car("audi", "a8"),
+            Car("toyota", "corolla"),
+        ).toDataFrame()
+
+        cars2["type"].type shouldBe typeOf<String>()
+        cars2["model"].type shouldBe typeOf<String>()
     }
 }