[IR][tests] Make ABI compatibility tests less verbose, part 2

compiler/testData/klibABI/removeAbstractFunctionFromAbstractClass/main/m.kt

@@ -1,26 +1,8 @@
+import abitestutils.abiTest
 import lib1.A
 import lib2.B
 
-fun box(): String {
+fun box() = abiTest {
     val a: A = B()
-
-    return try {
-        val answer: Int = a.foo() // <-- should throw linkage error here
-        println(answer)
-        "FAIL"
-    } catch (e: Throwable) {
-        e.checkLinkageError("foo", "B")
-    }
-}
-
-private fun Throwable.checkLinkageError(symbolName: String, className: String): String {
-    if (this::class.simpleName != "IrLinkageError") return "Unexpected throwable: ${this::class}"
-
-    val expectedMessage = "Abstract function $symbolName is not implemented in non-abstract class $className"
-    val actualMessage = message.orEmpty()
-
-    return if (expectedMessage == actualMessage)
-        "OK"
-    else
-        "EXPECTED: $expectedMessage, ACTUAL: $actualMessage"
+    expectFailure(nonImplementedCallable("function foo", "class B")) { a.foo() }
 }