Move stuff

intro-to-elm/part9/tests/RoutingTests.elm

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+module RoutingTests exposing (..)
+
+import Data.Article as Article exposing (Slug)
+import Data.User as User exposing (Username)
+import Expect exposing (Expectation)
+import Json.Decode exposing (decodeString)
+import Navigation exposing (Location)
+import Route exposing (Route(..))
+import Test exposing (..)
+
+
+-- TODO need to add lots more tests!
+
+
+fromLocation : Test
+fromLocation =
+    describe "Route.fromLocation"
+        [ testLocation "" Root
+        , testLocation "#login" Login
+        , testLocation "#logout" Logout
+        , testLocation "#settings" Settings
+        , testLocation "#profile/foo" (Profile (usernameFromStr "foo"))
+        , testLocation "#register" Register
+        , testLocation "#article/foo" (Article (slugFromStr "foo"))
+        , testLocation "#editor" NewArticle
+        , testLocation "#editor/foo" (EditArticle (slugFromStr "foo"))
+        ]
+
+
+
+-- HELPERS --
+
+
+testLocation : String -> Route -> Test
+testLocation hash route =
+    test ("Parsing hash: \"" ++ hash ++ "\"") <|
+        \() ->
+            makeHashLocation hash
+                |> Route.fromLocation
+                |> Expect.equal (Just route)
+
+
+makeHashLocation : String -> Location
+makeHashLocation hash =
+    { hash = hash
+    , href = ""
+    , host = ""
+    , hostname = ""
+    , protocol = ""
+    , origin = ""
+    , port_ = ""
+    , pathname = ""
+    , search = ""
+    , username = ""
+    , password = ""
+    }
+
+
+
+-- CONSTRUCTING UNEXPOSED VALUES --
+-- By decoding values that are not intended to be exposed directly - and crashing
+-- if they cannot be decoded, since crashing is harmless in tests - we can let
+-- our internal modules continue to expose only the intended ways of
+-- constructing those, while still being able to test them.
+
+
+usernameFromStr : String -> Username
+usernameFromStr str =
+    case decodeString User.usernameDecoder ("\"" ++ str ++ "\"") of
+        Ok username ->
+            username
+
+        Err err ->
+            Debug.crash ("Error decoding Username from \"" ++ str ++ "\": " ++ err)
+
+
+slugFromStr : String -> Slug
+slugFromStr str =
+    let
+        json =
+            """
+            { "description": null
+            , "slug": \"""" ++ str ++ """"
+            , "title": ""
+            , "tagList": []
+            , "createdAt": "2012-04-23T18:25:43.511Z"
+            , "updatedAt": "2012-04-23T18:25:43.511Z"
+            , "favorited": false
+            , "favoritesCount": 1
+            , "author":
+                 { "username": ""
+                 , "bio": null
+                 , "image": null
+                 , "following": false
+                 }
+            }
+        """
+    in
+    case decodeString Article.decoder json of
+        Ok article ->
+            article.slug
+
+        Err err ->
+            Debug.crash ("Error decoding Slug from \"" ++ str ++ "\": " ++ err)