Add negative tests for Find and Find All

Author: psaikkonen

src/test/robotframework/acceptance/FindTest.robot

@@ -1,5 +1,5 @@
 *** Settings ***
-Documentation       Tests to test javafxlibrary keywords
+Documentation       Tests to test javafxlibrary.keywords.AdditionalKeywords.Find related keywords
 Library             JavaFXLibrary
 Suite Setup         Setup all tests
 Suite Teardown      Teardown all tests
@@ -121,7 +121,46 @@ Find All With Pseudo Class
     Should Contain      ${hovered}      ${node}
 
 # TODO: Add test for text= prefix when next TestFX version comes out (4.0.14-alpha)
-# TODO: Add negative tests
+
+Nothing Is Found
+    [Tags]              smoke       negative
+    ${node}             Find        css=NoSuchSelector
+    Should Be Empty     ${node}
+
+Nothing Is Found When failIfNotFound Is True
+    [Tags]              smoke    negative
+    ${msg}              Run Keyword And Expect Error    *    Find    css=NoSuchSelector    true
+    Should Be Equal     ${msg}    Unable to find anything with query: "css=NoSuchSelector"
+
+Nothing Is Found With Find All
+    [Tags]              smoke       negative
+    ${nodes}            Find All    css=NoSuchSelector
+    Should Be Empty     ${nodes}
+
+Nothing Is Found With Find All When failIfNotFound Is True
+    [Tags]              smoke    negative
+    ${msg}              Run Keyword And Expect Error    *    Find All    css=NoSuchSelector    true
+    Should Be Equal     ${msg}    Unable to find anything with query: "css=NoSuchSelector"
+
+Previous Query Returns Nothing In Chained Selector
+    [Tags]              smoke    negative
+    ${node}             Find    css=VBox css=ZBox Pane id=lime
+    Should Be Empty     ${node}
+
+Previous Query Returns Nothing In Chained Selector With Find All
+    [Tags]              smoke    negative
+    ${nodes}            Find All    css=VBox css=ZBox Pane id=lime
+    Should Be Empty     ${nodes}
+
+Previous Query Returns Nothing In Chained Selector When failIfNotFound Is True
+    [Tags]              smoke    negative
+    ${msg}              Run Keyword And Expect Error    *    Find    css=VBox css=ZBox Pane id=lime    true
+    Should Be Equal     ${msg}    Unable to find anything with query: "css=VBox css=ZBox Pane id=lime"
+
+Previous Query Returns Nothing In Chained Selector With Find All When failIfNotFound Is True
+    [Tags]              smoke    negative
+    ${msg}              Run Keyword And Expect Error    *    Find All    css=VBox css=ZBox Pane id=lime    true
+    Should Be Equal     ${msg}    Unable to find anything with query: "css=VBox css=ZBox Pane id=lime"
 
 *** Keywords ***
 Setup all tests