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The Berlin Clock

The Berlin Uhr (Clock) is a rather strange way to show the time. On the top of the clock there is a yellow lamp that blinks on/off every two seconds. The time is calculated by adding rectangular lamps.

The top two rows of lamps are red. These indicate the hours of a day. In the top row there are 4 red lamps. Every lamp represents 5 hours. In the lower row of red lamps every lamp represents 1 hour. So if two lamps of the first row and three of the second row are switched on that indicates 5+5+3=13h or 1 pm.

The two rows of lamps at the bottom count the minutes. The first of these rows has 11 lamps, the second 4. In the first row every lamp represents 5 minutes. In this first row the 3rd, 6th and 9th lamp are red and indicate the first quarter, half and last quarter of an hour. The other lamps are yellow. In the last row with 4 lamps every lamp represents 1 minute.

One can be seen here

The brief

We have created a number of acceptance tests for the Berlin Clock and your challenge is to get them passing.

Some hints

ensure that your machine has visual studio (we used 2013), and the following 2 extensions: 1) Nuget 2) 'specflow for visual studio 2013' (or appropriate). These can be installed under menu tools, Extensions and updates.

The exercise contains an un-implemented Specflow BDD test (see http://www.specflow.org/getting-started/). The use of BDD in this instance is to provide you with our definition of done for the task.

Please ensure that you are familiar with our values in the instructions project. They are important to us.

  • simple, elegant code that reads like a narrative
  • thinking about the code more than the writing of the code (we spend a lot of time thinking/debating about what we are writing)
  • transparency and feedback to support continuous learning
  • excellent testing that acts as documentation for the code
  • challenging boundaries where necessary

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