`SchemaComparison` from `caliban-tools` does not detect changes in base interfaces

[Sergey Torgashov]

Versions:

• Caliban v2.5.0
• Scala v2.13.12

Minimal example:

import caliban.tools._
import zio._

object ExampleApp extends ZIOAppDefault {

  val schema1: String =
    """interface A { x: Int }
      |interface B { x: Int }
      |
      |type C implements A { x: Int }
      |""".stripMargin

  val schema2: String =
    """interface A { x: Int }
      |interface B { x: Int }
      |
      |type C implements B { x: Int } # NOTE: `C` implements `B` instead of `A`
      |""".stripMargin

  val schema3: String =
    """interface A { x: Int }
      |interface B { x: Int }
      |
      |type C { x: Int } # NOTE: `C` implements nothing
      |""".stripMargin

  val loader1: SchemaLoader = SchemaLoader.fromString(schema1)
  val loader2: SchemaLoader = SchemaLoader.fromString(schema2)
  val loader3: SchemaLoader = SchemaLoader.fromString(schema3)

  override def run: Task[Unit] = {
    for {
      changes12 <- SchemaComparison.compare(loader1, loader2)
      changes13 <- SchemaComparison.compare(loader1, loader3)
      changes23 <- SchemaComparison.compare(loader2, loader3)
      _ <- Console.printLine(s"changes12: $changes12")
      _ <- Console.printLine(s"changes13: $changes13")
      _ <- Console.printLine(s"changes23: $changes23")
    } yield ()
  }
}

Expected result:

• all three printed values (changes12, changes13, changes23) should reflect somehow that the base interface of type C is different between either of the schemas involved.

Actual result:

• all three values are printed as empty lists:

  changes12: List()
  changes13: List()
  changes23: List()
  

[kyri-petrou]

@satorg thanks for reporting this issue. Out of curiosity, is this also an issue with Scala 3?

[Sergey Torgashov]

@kyri-petrou , I've just checked it out. Looks like yes, the same issue for Scala 3.3.1.