Index: test/unit/issue_test.rb
===================================================================
--- test/unit/issue_test.rb	(revision 1977)
+++ test/unit/issue_test.rb	(working copy)
@@ -20,7 +20,7 @@
 class IssueTest < Test::Unit::TestCase
   fixtures :projects, :users, :members,
            :trackers, :projects_trackers,
-           :issue_statuses, :issue_categories,
+           :issue_statuses, :issue_categories, :issue_relations, :workflows, 
            :enumerations,
            :issues,
            :custom_fields, :custom_fields_projects, :custom_fields_trackers, :custom_values,
@@ -190,4 +190,36 @@
     assert_nil Issue.find_by_id(1)
     assert_nil TimeEntry.find_by_issue_id(1)
   end
+  
+  def test_blocked
+    blocked_issue = Issue.find(7)
+    blocking_issue = Issue.find(8)
+    
+    assert blocked_issue.blocked?
+    assert !blocking_issue.blocked?
+  end
+  
+  def test_blocked_issues_dont_allow_closed_statuses
+    blocked_issue = Issue.find(7)
+
+    allowed_statuses = blocked_issue.new_statuses_allowed_to(users(:users_002))
+    assert !allowed_statuses.empty?
+
+    allowed_statuses.each do |status|
+      assert !status.is_closed?
+    end
+
+    closed_statuses = allowed_statuses.find_all {|st| st.is_closed?}
+    assert closed_statuses.empty?
+  end
+
+  def test_unblocked_issues_allow_closed_statuses
+    blocking_issue = Issue.find(8)
+
+    allowed_statuses = blocking_issue.new_statuses_allowed_to(users(:users_002))
+    assert !allowed_statuses.empty?
+
+    closed_statuses = allowed_statuses.find_all {|st| st.is_closed?}
+    assert !closed_statuses.empty?
+  end
 end
Index: test/fixtures/issues.yml
===================================================================
--- test/fixtures/issues.yml	(revision 1977)
+++ test/fixtures/issues.yml	(working copy)
@@ -91,4 +91,35 @@
   status_id: 1
   start_date: <%= Date.today.to_s(:db) %>
   due_date: <%= 1.days.from_now.to_date.to_s(:db) %>
-  
\ No newline at end of file
+issues_007: 
+  created_on: <%= 1.minute.ago.to_date.to_s(:db) %>
+  project_id: 5
+  updated_on: <%= 1.minute.ago.to_date.to_s(:db) %>
+  priority_id: 3
+  subject: Blocked Issue
+  id: 7
+  fixed_version_id: 
+  category_id: 
+  description: This is an issue that is blocked by another
+  tracker_id: 1
+  assigned_to_id: 
+  author_id: 2
+  status_id: 1
+  start_date: <%= Date.today.to_s(:db) %>
+  due_date: <%= 1.days.from_now.to_date.to_s(:db) %>
+issues_008: 
+  created_on: <%= 1.minute.ago.to_date.to_s(:db) %>
+  project_id: 5
+  updated_on: <%= 1.minute.ago.to_date.to_s(:db) %>
+  priority_id: 3
+  subject: Issue Doing the Blocking
+  id: 8
+  fixed_version_id: 
+  category_id: 
+  description: This is an issue that blocks issue 7
+  tracker_id: 1
+  assigned_to_id: 
+  author_id: 2
+  status_id: 1
+  start_date: <%= Date.today.to_s(:db) %>
+  due_date: <%= 1.days.from_now.to_date.to_s(:db) %>
Index: test/fixtures/issue_relations.yml
===================================================================
--- test/fixtures/issue_relations.yml	(revision 0)
+++ test/fixtures/issue_relations.yml	(revision 0)
@@ -0,0 +1,8 @@
+issue_relation_001:
+  id: 1
+  issue_from_id: 8
+  issue_to_id: 7
+  relation_type: blocks
+  delay:
+
+  
\ No newline at end of file
Index: app/models/issue.rb
===================================================================
--- app/models/issue.rb	(revision 1977)
+++ app/models/issue.rb	(working copy)
@@ -199,11 +199,19 @@
     project.assignable_users
   end
   
+  # Returns true if this issue is blocked by another issue that is still open
+  def blocked?
+    !(relations_to.find_all {|ir| ir.relation_type == 'blocks' && !ir.issue_from.closed?}.empty?)
+  end
+  
   # Returns an array of status that user is able to apply
   def new_statuses_allowed_to(user)
     statuses = status.find_new_statuses_allowed_to(user.role_for_project(project), tracker)
     statuses << status unless statuses.empty?
-    statuses.uniq.sort
+
+    unified_list = statuses.uniq.sort
+    
+    blocked? ? unified_list.reject {|s| s.is_closed?} : unified_list
   end
   
   # Returns the mail adresses of users that should be notified for the issue