Fix flaky typecheck-all-parents-of-interest test

Author: wz1000

ghcide/test/exe/Main.hs

@@ -743,6 +743,10 @@ diagnosticTests = testGroup "diagnostics"
 
     -- Open A and edit to fix the type error
     adoc <- createDoc aPath "haskell" aSource
+    expectDiagnostics
+      [("A.hs", [(DsError, (5, 4), "Couldn't match expected type 'Int' with actual type 'Bool'")])
+      ]
+
     changeDoc adoc [TextDocumentContentChangeEvent Nothing Nothing $
                     T.unlines ["module A where", "import B", "x :: Bool", "x = y"]]