Ensure that ClickedThumbnail message is emitted

tests/PhotoGrooveTest.elm

@@ -1,12 +1,13 @@
 module PhotoGrooveTest exposing (..)
 
 import Expect
-import Fuzz
+import Fuzz exposing (Fuzzer)
 import Html.Attributes as Attr
 import Json.Decode as J
 import Json.Encode as Encode
 import PhotoGroove.Internal as Testee exposing (FilterType(..), FilterValues, Message(..), Photo, filterTypeToName, initialModel)
 import Test exposing (..)
+import Test.Html.Event as Event
 import Test.Html.Query as Query
 import Test.Html.Selector exposing (attribute, tag)
 
@@ -89,6 +90,28 @@ thumbnailRendered url query =
         |> Query.count (Expect.atLeast 1)
 
 
+clickThumbnail : Test
+clickThumbnail =
+    fuzz3 urlFuzzer Fuzz.string urlFuzzer "clicking a thumbnail selects it" <|
+        \urlsBefore urlSelected urlsAfter ->
+            let
+                url =
+                    urlSelected ++ ".jpeg"
+
+                photos =
+                    (urlsBefore ++ url :: urlsAfter) |> List.map photoFromUrl
+
+                srcToClick =
+                    Testee.urlPrefix ++ url
+            in
+            { initialModel | status = Testee.Loaded photos "" }
+                |> Testee.view
+                |> Query.fromHtml
+                |> Query.find [ tag "img", attribute (Attr.src srcToClick) ]
+                |> Event.simulate Event.click
+                |> Event.expect (Testee.ClickedThumbnail url)
+
+
 photoFromUrl : String -> Photo
 photoFromUrl url =
     { url = url, size = 0, title = "" }
@@ -105,3 +128,15 @@ selectedUrl status =
 
         Testee.Errored _ ->
             Nothing
+
+
+urlFuzzer : Fuzzer (List String)
+urlFuzzer =
+    Fuzz.intRange 1 5
+        |> Fuzz.map urlsFromCount
+
+
+urlsFromCount : Int -> List String
+urlsFromCount count =
+    List.range 1 count
+        |> List.map (\num -> String.fromInt num ++ ".jpg")