Add tests ensuring platform defaults compatibility with the latest Scala Toolkit

Author: Gedochao

modules/integration/src/test/scala/scala/cli/integration/RunScalaJsTestDefinitions.scala

@@ -265,4 +265,22 @@ trait RunScalaJsTestDefinitions { _: RunTestDefinitions =>
       expect(output == "H")
     }
   }
+
+  test("js defaults & toolkit latest") {
+    val msg = "Hello"
+    TestInputs(
+      os.rel / "script.sc" ->
+        s"""//> using toolkit latest
+           |//> using platform "scala-js"
+           |import scala.scalajs.js
+           |val console = js.Dynamic.global.console
+           |val jsonString = "{\\"msg\\": \\"$msg\\"}"
+           |val json: ujson.Value  = ujson.read(jsonString)
+           |console.log(json("msg").str)
+           |""".stripMargin
+    ).fromRoot { root =>
+      val result = os.proc(TestUtil.cli, "run", "script.sc").call(cwd = root)
+      expect(result.out.trim() == msg)
+    }
+  }
 }

modules/integration/src/test/scala/scala/cli/integration/RunScalaNativeTestDefinitions.scala

@@ -300,4 +300,17 @@ trait RunScalaNativeTestDefinitions { _: RunTestDefinitions =>
       expect(output2 == "Hello from Main2")
     }
   }
+
+  test("native defaults & toolkit latest") {
+    TestInputs(
+      os.rel / "script.sc" ->
+        """//> using toolkit latest
+          |//> using platform "scala-native"
+          |println(os.pwd)
+          |""".stripMargin
+    ).fromRoot { root =>
+      val result = os.proc(TestUtil.cli, "run", "script.sc").call(cwd = root)
+      expect(result.out.trim() == root.toString)
+    }
+  }
 }