Gems that don't exist just return an empty array for resolving

Signed-off-by: Nick Quaranto <nick@quaran.to>

features/resolve.feature

@@ -34,3 +34,14 @@ Feature: Resolver endpoint
       | stalker | <= 2.0.0     |
       | zealot  | = 1.0.0      |
     And I should not see any dependencies for "zerg" version "1.0.0"
+
+  Scenario: Resolve zerg non-existent gem
+    When I request "/api/v1/dependencies?gems=zerg,XelNaga"
+    Then I should see the following dependencies for "zerg-1.0.0-java":
+      | Name  | Requirements |
+      | drone | >= 0         |
+    And I should see only 1 element in the array
+
+  Scenario: Resolve non-existent gem
+    When I request "/api/v1/dependencies?gems=XelNaga"
+    Then I should see an empty array

features/step_definitions/view_steps.rb

@@ -25,13 +25,12 @@
 end
 
 Then /^I should see the following dependencies for "([^"]*)":$/ do |full_name, table|
-  data    = Marshal.load(response.body)
   version = Version.find_by_full_name!(full_name)
 
   table.hashes.each do |row|
-    gem_hash = data.detect { |hash| hash[:name]     == version.rubygem.name &&
-                                    hash[:number]   == version.number &&
-                                    hash[:platform] == version.platform }
+    gem_hash = marshal_body.detect { |hash| hash[:name]     == version.rubygem.name &&
+                                            hash[:number]   == version.number &&
+                                            hash[:platform] == version.platform }
 
     assert gem_hash.present?
 
@@ -40,7 +39,16 @@
 end
 
 Then /^I should not see any dependencies for "([^"]*)" version "([^"]*)"$/ do |rubygem_name, version_number|
-  data = Marshal.load(response.body)
-  gem_hash = data.detect { |hash| hash[:name] == rubygem_name && hash[:number] == version_number }
+  gem_hash = marshal_body.detect { |hash| hash[:name] == rubygem_name && hash[:number] == version_number }
   assert_nil gem_hash
 end
+
+Then "I should see an empty array" do
+  assert marshal_body.is_a?(Array)
+  assert marshal_body.empty?
+end
+
+Then /^I should see only (\d+) element in the array$/ do |count|
+  assert_equal count.to_i, marshal_body.size
+end
+

features/support/api.rb

@@ -2,6 +2,10 @@ module ApiHelpers
   def api_key_header
     header("HTTP_AUTHORIZATION", @api_key)
   end
+
+  def marshal_body
+    @_marshal_body ||= Marshal.load(response.body)
+  end
 end
 
 World(ApiHelpers)