Add tests for applying multiple fixes on a file

tests/FixTest.elm

@@ -173,4 +173,37 @@ a = 1
                     |> Expect.equal """module A exposing (a)
 a = Debug.log "foo" 1
 """
+        , test "should apply multiple fixes regardless of the order" <|
+            \() ->
+                let
+                    source : String
+                    source =
+                        """module A exposing (a)
+a = 1
+"""
+
+                    fixes =
+                        [ Fix.replaceRangeBy
+                            { start = { row = 2, column = 1 }
+                            , end = { row = 2, column = 2 }
+                            }
+                            "someVar"
+                        , Fix.insertAt
+                            { row = 2, column = 5 }
+                            """Debug.log "foo" """
+                        ]
+                in
+                Expect.all
+                    [ \() ->
+                        Fix.fix fixes source
+                            |> Expect.equal """module A exposing (a)
+someVar = Debug.log "foo" 1
+"""
+                    , \() ->
+                        Fix.fix (List.reverse fixes) source
+                            |> Expect.equal """module A exposing (a)
+someVar = Debug.log "foo" 1
+"""
+                    ]
+                    ()
         ]