Memory game

• 2 players
• first player starts
• turn 1 card, then another
• if 2 equal cards, score++ and player can go again
• if 2 cards not equal, cards

Interface

void appendToStream(String streamId, Event[] events)
Event[] streamById(String streamId)

Tests

given [<events>]
when <command>
then [<events>]

Example

given []
when StartGame("Thomas, Michel", 1)
then GameStarted("Thomas, Michel", 1)

given GameStarted("Thomas, Michel", 1)
when StartGame("Thomas", "Michel", 1)
then Exception

given GameStarted("Thomas, Michel", 1)
when TurnCard("Michel", ...)
then Exception