Add Announcement tests

Gemfile

@@ -104,4 +104,5 @@ group :development, :test do
   gem 'letter_opener' # Use this just in local test environments
   gem 'brakeman'
   gem 'guard-brakeman'
+  gem 'timecop'
 end

Gemfile.lock

@@ -456,6 +456,7 @@ GEM
     thor (1.0.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
+    timecop (0.9.1)
     tiny-color-rails (0.0.2)
       railties (>= 3.0)
     turbolinks (2.5.4)
@@ -566,6 +567,7 @@ DEPENDENCIES
   simplecov-rcov
   spring (~> 2.0)
   sweetalert-rails
+  timecop
   tiny-color-rails
   tumblr_client!
   turbolinks (~> 2.5.3)

spec/models/announcement_spec.rb

@@ -1,5 +1,47 @@
-require 'rails_helper'
+# frozen_string_literal: true
 
-RSpec.describe Announcement, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+require "rails_helper"
+
+RSpec.describe(Announcement, type: :model) do
+  let!(:user) { FactoryBot.create :user }
+  let!(:me) do
+    Announcement.new(
+      content: "Raccoon",
+      starts_at: Time.current,
+      ends_at: Time.current + 1.day,
+      user: user
+    )
+  end
+
+  describe "#active?" do
+    it "returns true when the current time is between starts_at and ends_at" do
+      expect(me.active?).to be(true)
+    end
+
+    it "returns false when the current time is before starts_at" do
+      Timecop.freeze(me.starts_at - 1.second)
+      expect(me.active?).to be(false)
+      Timecop.return
+    end
+
+    it "returns false when the current time is after ends_at" do
+      Timecop.freeze(me.ends_at)
+      expect(me.active?).to be(false)
+      Timecop.return
+    end
+  end
+
+  describe "#link_present?" do
+    it "returns true if a link is present" do
+      me.link_text = "Very good dogs"
+      me.link_href = "https://www.reddit.com/r/rarepuppers/"
+      expect(me.link_present?).to be(true)
+    end
+
+    it "returns false if a link is not present" do
+      me.link_text = nil
+      me.link_href = nil
+      expect(me.link_present?).to be(false)
+    end
+  end
 end