refactor: move language examples to fixture files

tests/fixtures/languages/elm/test.elm

@@ -0,0 +1,38 @@
+module Main exposing (main, Person, Greeting)
+
+import Html exposing (Html, div, text)
+import Html.Attributes exposing (class)
+
+type alias Person =
+    { name : String
+    , age : Int
+    }
+
+type Greeting
+    = Formal
+    | Casual
+
+greet : Greeting -> Person -> String
+greet style person =
+    let
+        prefix =
+            case style of
+                Formal ->
+                    "Good day"
+
+                Casual ->
+                    "Hi"
+    in
+    prefix ++ ", " ++ person.name ++ "!"
+
+defaultPerson : Person
+defaultPerson =
+    { name = "World"
+    , age = 42
+    }
+
+main : Html msg
+main =
+    div [ class "greeting" ]
+        [ text (greet Formal defaultPerson)
+        ]