Add tests for UserActivities module

Tests:
- Activity grouping by day and type
- Pagination with limit/offset
- Activity day counting
- All activity types inclusion
- Visibility flag handling

test/lib/user_activities_test.rb

@@ -0,0 +1,112 @@
+require "test_helper"
+
+class UserActivitiesTest < ActiveSupport::TestCase
+  def setup
+    @user = create(:user)
+    # Create a language for diary entries
+    Language.create!(:code => "en", :english_name => "English")
+  end
+
+  def test_for_user_returns_activities_grouped_by_day
+    # Create activities on different days
+    create(:changeset, :user => @user, :created_at => 2.days.ago)
+    create(:diary_entry, :user => @user, :created_at => 2.days.ago)
+    create(:changeset, :user => @user, :created_at => 1.day.ago)
+    create(:note_comment, :author => @user, :created_at => 1.day.ago)
+
+    activities = UserActivities.for_user(@user.id)
+
+    assert_equal 2, activities.length # Two days of activities
+
+    # First day should have activities
+    first_day = activities[0]
+    assert first_day["activity_date"]
+    assert first_day["activity_groups"]
+
+    # Second day should have activities
+    second_day = activities[1]
+    assert second_day["activity_date"]
+    assert second_day["activity_groups"]
+
+    # Check that we have the right number of activities per day
+    first_day_count = JSON.parse(first_day["activity_groups"]).values.sum { |g| g["count"] }
+    second_day_count = JSON.parse(second_day["activity_groups"]).values.sum { |g| g["count"] }
+    assert_equal 2, first_day_count
+    assert_equal 2, second_day_count
+  end
+
+  def test_for_user_respects_limit_and_offset
+    # Create activities across three days
+    create(:changeset, :user => @user, :created_at => 3.days.ago)
+    create(:diary_entry, :user => @user, :created_at => 2.days.ago)
+    create(:note_comment, :author => @user, :created_at => 1.day.ago)
+
+    # Get first page
+    activities = UserActivities.for_user(@user.id, :limit => 2, :offset => 0)
+    assert_equal 2, activities.length
+
+    # Get second page
+    activities = UserActivities.for_user(@user.id, :limit => 2, :offset => 2)
+    assert_equal 1, activities.length
+  end
+
+  def test_count_activities_returns_number_of_active_days
+    create(:changeset, :user => @user, :created_at => 2.days.ago)
+    create(:diary_entry, :user => @user, :created_at => 2.days.ago) # Same day
+    create(:note_comment, :author => @user, :created_at => 1.day.ago) # Different day
+
+    count = UserActivities.count_activities(@user.id)
+    assert_equal 2, count # Should count two distinct days
+  end
+
+  def test_activities_include_all_types
+    # Create one of each activity type
+    changeset = create(:changeset, :user => @user)
+    diary = create(:diary_entry, :user => @user)
+    note = create(:note_comment, :author => @user)
+    gpx = create(:trace, :user => @user)
+    diary_comment = create(:diary_comment, :user => @user)
+
+    activities = UserActivities.for_user(@user.id)
+
+    # Extract all items from all activity groups
+    all_items = []
+    activities.each do |day|
+      groups = JSON.parse(day["activity_groups"])
+      groups.each_value do |group|
+        items = group["items"].is_a?(String) ? JSON.parse(group["items"]) : group["items"]
+        all_items.concat(items)
+      end
+    end
+
+    # Check that each activity type is present
+    assert(all_items.any? { |i| i["reference_id"] == changeset.id })
+    assert(all_items.any? { |i| i["reference_id"] == diary.id })
+    assert(all_items.any? { |i| i["reference_id"] == note.note_id })
+    assert(all_items.any? { |i| i["reference_id"] == gpx.id })
+    assert(all_items.any? { |i| i["reference_id"] == diary_comment.diary_entry_id })
+  end
+
+  def test_activities_respect_visibility
+    # Create visible and invisible items
+    create(:diary_entry, :user => @user, :visible => true)
+    create(:diary_entry, :user => @user, :visible => false)
+    create(:diary_comment, :user => @user, :visible => true)
+    create(:diary_comment, :user => @user, :visible => false)
+
+    activities = UserActivities.for_user(@user.id)
+
+    # Count all items from all activity groups
+    all_items = []
+    activities.each do |day|
+      groups = JSON.parse(day["activity_groups"])
+      groups.each_value do |group|
+        items = group["items"].is_a?(String) ? JSON.parse(group["items"]) : group["items"]
+        all_items.concat(items)
+      end
+    end
+
+    # Should only include visible items
+    assert_equal 2, all_items.length
+  end
+end