Support for checking loaded descriptors agains an expected txt file

compiler/testData/lazyResolve/diagnostics/incompleteCode/incompleteAssignment.txt

@@ -0,0 +1,10 @@
+namespace <root>
+
+// <namespace name="sum">
+namespace sum
+
+internal final fun </*0*/ T : jet.Any?>assertEquals(/*0*/ actual: T?, /*1*/ expected: T?, /*2*/ message: jet.Any? = ?): jet.Tuple0
+internal final fun main(/*0*/ args: jet.Array<jet.String>): jet.Tuple0
+internal final fun sum(/*0*/ a: jet.IntArray): jet.Int
+internal final fun test(/*0*/ expectedSum: jet.Int, /*1*/ vararg data: jet.Int /*jet.IntArray*/): jet.Tuple0
+// </namespace name="sum">