Fix issues mentioned but not closed for JIRA

The `ReferenceExtractor` would return an array of `ExternalIssue`
objects, and then perform `Array#-` to remove the issues
closed. `ExternalIssue`s had `==` defined, but not `hash` or `eql?`,
which are used by `Array#-`.

1 files changed, 9 insertions, 0 deletions

diff --git a/spec/factories/services.rb b/spec/factories/services.rb
index 51335bdcf1d..88f6c265505 100644
--- a/spec/factories/services.rb
+++ b/spec/factories/services.rb
@@ -12,4 +12,13 @@ FactoryGirl.define do
       token: 'a' * 40,
     })
   end
+
+  factory :jira_service do
+    project factory: :empty_project
+    active true
+    properties(
+      url: 'https://jira.example.com',
+      project_key: 'jira-key'
+    )
+  end
 end