Specs: add more tests for StoryRepository (#562)

This brings test coverage up to 100%, so I'm also enabling the
`minimum_coverage` threshold to make sure it stays there.

spec/factories/stories.rb

@@ -1,6 +1,7 @@
 module Factories
   STORY_TRAITS = {
     read: -> { { is_read: true } },
+    starred: -> { { is_starred: true } },
     unread: -> { { is_read: false } }
   }.freeze
 

spec/repositories/story_repository_spec.rb

@@ -293,6 +293,61 @@
     end
   end
 
+  describe ".starred" do
+    it "returns starred stories" do
+      story = create_story(:starred)
+
+      expect(StoryRepository.starred).to eq([story])
+    end
+
+    it "sorts stories by published" do
+      story1 = create_story(:starred, published: 1.day.ago)
+      story2 = create_story(:starred, published: 1.hour.ago)
+
+      expect(StoryRepository.starred).to eq([story2, story1])
+    end
+
+    it "does not return unstarred stories" do
+      create_story
+
+      expect(StoryRepository.starred).to be_empty
+    end
+
+    it "paginates results" do
+      stories =
+        21.times.map { |num| create_story(:starred, published: num.days.ago) }
+
+      expect(StoryRepository.starred).to eq(stories[0...20])
+      expect(StoryRepository.starred(2)).to eq([stories.last])
+    end
+  end
+
+  describe ".unstarred_read_stories_older_than" do
+    it "returns unstarred read stories older than given number of days" do
+      story = create_story(:read, published: 6.days.ago)
+
+      expect(StoryRepository.unstarred_read_stories_older_than(5)).to eq([story])
+    end
+
+    it "does not return starred stories older than the given number of days" do
+      create_story(:read, :starred, published: 6.days.ago)
+
+      expect(StoryRepository.unstarred_read_stories_older_than(5)).to be_empty
+    end
+
+    it "does not return unread stories older than the given number of days" do
+      create_story(:unread, published: 6.days.ago)
+
+      expect(StoryRepository.unstarred_read_stories_older_than(5)).to be_empty
+    end
+
+    it "does not return stories newer than given number of days" do
+      create_story(:read, published: 4.days.ago)
+
+      expect(StoryRepository.unstarred_read_stories_older_than(5)).to be_empty
+    end
+  end
+
   describe ".read_count" do
     it "returns the count of read stories" do
       create_story(:read)

spec/support/coverage.rb

@@ -14,4 +14,6 @@
   add_group("Repositories", "app/repositories")
   add_group("Tasks", "app/tasks")
   add_group("Utils", "app/utils")
+  add_filter("/db/migrate/")
 end
+SimpleCov.minimum_coverage(100)