FEATURE: allow admins to choose a group as a primary group

FEATURE: allow admins to set a default title for a group

spec/models/group_spec.rb

@@ -47,7 +47,73 @@ describe Group do
     Group[:staff].user_ids - [-1]
   end
 
-  it "Correctly handles primary group" do
+  it "Correctly handles primary groups" do
+    group = Fabricate(:group, primary_group: true)
+    user = Fabricate(:user)
+
+    group.add(user)
+
+    user.reload
+    expect(user.primary_group_id).to eq group.id
+
+    group.remove(user)
+
+    user.reload
+    expect(user.primary_group_id).to eq nil
+
+    group.add(user)
+    group.primary_group = false
+    group.save
+
+    user.reload
+    expect(user.primary_group_id).to eq nil
+
+  end
+
+  it "Correctly handles title" do
+
+    group = Fabricate(:group, title: 'Super Awesome')
+    user = Fabricate(:user)
+
+    expect(user.title).to eq nil
+
+    group.add(user)
+    user.reload
+
+    expect(user.title).to eq 'Super Awesome'
+
+    group.title = 'BOOM'
+    group.save
+
+    user.reload
+    expect(user.title).to eq 'BOOM'
+
+    group.title = nil
+    group.save
+
+    user.reload
+    expect(user.title).to eq nil
+
+    group.title = "BOB"
+    group.save
+
+    user.reload
+    expect(user.title).to eq "BOB"
+
+    group.remove(user)
+
+    user.reload
+    expect(user.title).to eq nil
+
+    group.add(user)
+    group.destroy
+
+    user.reload
+    expect(user.title).to eq nil
+
+  end
+
+  it "Correctly handles removal of primary group" do
     group = Fabricate(:group)
     user = Fabricate(:user)
     group.add(user)