Add tests for coerce_json_field

test/lightning/helpers_test.exs

@@ -1,16 +1,27 @@
 defmodule Lightning.HelpersTest do
-  describe "Helpers" do
-    import Lightning.Helpers, only: [coerce_json_field: 2]
+  use ExUnit.Case, async: true
 
-    test "coerce a good json string" do
-      json = %{name: "Sadio Mane", stats: "{'goals':126, 'teams': ['Metz', 'Liverpool']}"}
+  import Lightning.Helpers, only: [coerce_json_field: 2]
 
-      coerced_map = coerce_json_field(json, "stats")
+  test "coerce_json_field/2 will transform a json string inside a map by it's key" do
+    input = %{
+      "body" =>
+        "{\n  \"a\": 1,\n  \"b\": {\n    \"sadio\": true, \"other\": [1,2,\"bah\"]\n  }\n}",
+      "name" => "My Credential"
+    }
 
-      assert coerced_map = %{
-               name: "Sadio Mane",
-               stats: %{goals: 126, teams: ['Metz', 'Liverpool']}
-             }
-    end
+    assert coerce_json_field(input, "body") == %{
+             "body" => %{"a" => 1, "b" => %{"other" => [1, 2, "bah"], "sadio" => true}},
+             "name" => "My Credential"
+           }
+  end
+
+  test "coerce_json_field/2 will not do anything if the json string inside a map is invalid" do
+    input = %{name: "Sadio Mane", stats: "goals:126, teams: Metz, Liverpool"}
+
+    assert coerce_json_field(input, "stats") == %{
+             name: "Sadio Mane",
+             stats: "goals:126, teams: Metz, Liverpool"
+           }
   end
 end