Add tests for json decoding.

stages/3/src/ElmHub.elm

@@ -55,10 +55,11 @@ responseDecoder =
 
 searchResultDecoder : Decoder SearchResult
 searchResultDecoder =
-  Json.Decode.object2
+  Json.Decode.object3
     SearchResult
     ("id" := Json.Decode.int)
     ("name" := Json.Decode.string)
+    ("stargazers_count" := Json.Decode.int)
 
 
 type alias Model =
@@ -70,6 +71,7 @@ type alias Model =
 type alias SearchResult =
   { id : ResultId
   , name : String
+  , stars : Int
   }
 
 
@@ -107,7 +109,11 @@ defaultValue str =
 
 viewSearchResult : SearchResult -> Html
 viewSearchResult result =
-  div [] [ text result.name ]
+  div
+    []
+    [ div [ class "star-count" ] [ text (toString result.stars) ]
+    , div [] [ text result.name ]
+    ]
 
 
 type Action

stages/3/test/Tests.elm

@@ -1,15 +1,35 @@
-module Tests where
+module Tests (..) where
 
 import ElmTest exposing (..)
-
-import String
+import ElmHub exposing (responseDecoder)
+import Json.Decode exposing (decodeString)
 
 
 all : Test
 all =
-    suite "A Test Suite"
-        [
-            test "Addition" (assertEqual (3 + 7) 10),
-            test "String.left" (assertEqual "a" (String.left 1 "abcdefg")),
-            test "This test should fail" (assert False)
+  suite
+    "Decoding responses from GitHub"
+    [ test "they can decode empty responses"
+        <| let
+            emptyResponse =
+              """{ "items": [] }"""
+           in
+            assertEqual
+              (decodeString responseDecoder emptyResponse)
+              (Ok [])
+    , test "they can decode responses with results in them"
+        <| let
+            response =
+              """{ "items": [
+                { "id": 5, "name": "foo", "stargazers_count": 42 },
+                { "id": 3, "name": "bar", "stargazers_count": 77 }
+              ] }"""
+           in
+            assertEqual
+              (decodeString responseDecoder response)
+              (Ok
+                [ { id = 5, name = "foo", stars = 42 }
+                , { id = 3, name = "bar", stars = 77 }
+                ]
+              )
     ]