[digitalocean|compute] added get_ssh_key request and tests

lib/fog/digitalocean/requests/compute/get_ssh_key.rb

@@ -0,0 +1,39 @@
+module Fog
+  module Compute
+    class DigitalOcean 
+      class Real
+
+        #
+        # This method shows a specific public SSH key in your account
+        # that can be added to a droplet.
+        #
+        # @see https://www.digitalocean.com/api#ssh_keys
+        #
+        def get_ssh_key(id)
+          request(
+            :expects  => [200],
+            :method   => 'GET',
+            :path     => "ssh_keys/#{id}"
+          )
+        end
+
+      end
+
+      class Mock
+
+        def get_ssh_key(id)
+          response = Excon::Response.new
+          response.status = 200
+          response.body = {
+            "status" => "OK",
+            # key listing does not return ssh_pub_key
+            # https://www.digitalocean.com/api#ssh_keys
+            "ssh_key"  => self.data[:ssh_keys].find { |k| k['id'] == id }
+          }
+          response
+        end
+
+      end
+    end
+  end
+end

tests/digitalocean/requests/compute/get_ssh_key_tests.rb

@@ -0,0 +1,22 @@
+Shindo.tests('Fog::Compute[:digitalocean] | get_ssh_keys request', ['digitalocean', 'compute']) do
+
+  @ssh_key_format = {
+    'id'             => Integer,
+    'name'           => String,
+    'ssh_pub_key'    => String,
+  }
+  
+  service = Fog::Compute[:digitalocean]
+
+  tests('success') do
+
+    tests('#get_ssh_key') do
+      key = service.create_ssh_key 'fookey', 'ssh-dss FOO'
+      tests('format').data_matches_schema(@ssh_key_format) do
+        service.get_ssh_key(key.body['ssh_key']['id']).body['ssh_key']
+      end
+    end
+
+  end
+
+end