Add code

data-tables/features/json.feature

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+Feature:
+	As the owner of a book collection
+	I want to be able to generate JSON containing titles from this collection
+
+	Scenario:
+		Given the following books by Simon Frank are in the collection:
+			| id | title                      |
+			| 1  | Der Gegenstand des Wissens |
+			| 2  | Lebendiges Wissen          |
+		When I stringify it
+		Then I should get:
+			"""
+			[{
+			  "id": 1,
+			  "title": "Der Gegenstand des Wissens"
+			},{
+			  "id": 2,
+			  "title": "Lebendiges Wissen"
+			}]
+			"""
+
+		Given the following books by Søren Kierkegaard are in the collection:
+			| id | title                  |
+			| 1  | Die Krankheit zum Tode |
+			| 2  | Entweder-Oder          |
+		When I stringify it
+		Then I should get:
+			"""
+			[{
+			  "id": 1,
+			  "title": "Die Krankheit zum Tode"
+			},{
+			  "id": 2,
+			  "title": "Entweder-Oder"
+			}]
+			"""
+
+		Given the following book is in the collection:
+			| id     | 1               |
+			| title  | Leonce und Lena |
+			| author | Georg Büchner   |
+		When I stringify it
+		Then I should get:
+			"""
+			{
+			  "id": 1,
+			  "title": "Leonce und Lena",
+			  "author": "Georg Büchner"
+			}
+			"""
+
+		Given the following books are in the collection:
+			| Friedrich Nietzsche | Die Geburt der Tragödie    |
+			| Jacques Derrida     | Die unbedingte Universität |
+			| Honoré de Balzac    | Die Frau von 30 Jahren     |
+		When I stringify it
+		Then I should get:
+			"""
+			[{
+			  "author": "Friedrich Nietzsche",
+			  "title": "Die Geburt der Tragödie"
+			},{
+			  "author": "Jacques Derrida",
+			  "title": "Die unbedingte Universität"
+			},{
+			  "author": "Honoré de Balzac",
+			  "title": "Die Frau von 30 Jahren"
+			}]
+			"""