add specs for version bump rake task

spec/integration/generated_locale_spec.rb

@@ -1,14 +1,13 @@
 # frozen_string_literal: true
 
 require "rails_helper"
+require "support/load_rake_tasks"
 
 describe "test locale generation" do
-  before(:context) { Rails.application.load_tasks }
-
   it "succeeds" do
     allow($stdout).to receive(:puts)
 
-    Rake::Task["locale:generate"].invoke
+    Rake::Task["locale:generate"].execute
 
     %w[activerecord controllers errors frontend views voc].each do |locale_type|
       expect($stdout).to have_received(:puts).with a_string_including("generating #{locale_type}.en-xx.yml")

spec/integration/version_bump_spec.rb

@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+require "support/load_rake_tasks"
+
+describe "version bumping tasks" do
+  include ActiveSupport::Testing::TimeHelpers
+
+  describe "version:bump" do
+    around do |example|
+      # make a backup of our version file
+      version_path = Rails.root.join("lib/retrospring/version.rb")
+      version_contents = File.read(version_path)
+      example.run
+    ensure
+      # restore our version file
+      File.write(version_path, version_contents)
+    end
+
+    it "updates the version if the version date differs" do
+      travel_to(Time.utc(2069, 6, 21, 13, 37, 0))
+      allow($stdout).to receive(:puts)
+
+      Rake::Task["version:bump"].execute
+
+      expect($stdout).to have_received(:puts).with "New version: 2069.0621.0"
+      travel_back
+    end
+
+    context "when version is already from today" do
+      before do
+        allow(Retrospring::Version).to receive(:year).and_return 2069
+        allow(Retrospring::Version).to receive(:month).and_return 6
+        allow(Retrospring::Version).to receive(:day).and_return 21
+        allow(Retrospring::Version).to receive(:patch).and_return 0
+
+        # just stubbing the constant is not enough, we need to stub away the
+        # reading of the version file too; otherwise only the patch value is
+        # updated
+        version_path = Rails.root.join("lib/retrospring/version.rb")
+        version_contents = File.read(version_path)
+                               .sub!(/def year = .+/,  "def year = 2069")
+                               .sub!(/def month = .+/, "def month = 6")
+                               .sub!(/def day = .+/,   "def day = 21")
+                               .sub!(/def patch = .+/, "def patch = 0")
+        allow(File).to receive(:read).with(version_path).and_return(version_contents)
+      end
+
+      it "updates the version if the version date differs" do
+        travel_to(Time.utc(2069, 6, 21, 13, 37, 0))
+        allow($stdout).to receive(:puts)
+
+        Rake::Task["version:bump"].execute
+
+        expect($stdout).to have_received(:puts).with "Current version: 2069.0621.0"
+        expect($stdout).to have_received(:puts).with "New version: 2069.0621.1"
+        travel_back
+      end
+    end
+  end
+
+  describe "version:commit" do
+    before do
+      allow(Retrospring::Version).to receive(:year).and_return 2069
+      allow(Retrospring::Version).to receive(:month).and_return 6
+      allow(Retrospring::Version).to receive(:day).and_return 21
+      allow(Retrospring::Version).to receive(:patch).and_return 3
+    end
+
+    it "runs the correct git commands" do
+      allow($stdout).to receive(:puts)
+      version_path = Rails.root.join("lib/retrospring/version.rb")
+
+      expect_any_instance_of(Rake::FileUtilsExt)
+        .to receive(:sh)
+        .with(%(git commit -m 'Bump version to 2069.0621.3' -- #{version_path.to_s.inspect}))
+      expect_any_instance_of(Rake::FileUtilsExt)
+        .to receive(:sh)
+        .with(%(git tag -a -m 'Bump version to 2069.0621.3' 2069.0621.3))
+
+      Rake::Task["version:commit"].execute
+    end
+  end
+end

spec/support/load_rake_tasks.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+# ensure Rake tasks are only loaded once during the entire RSpec run.
+#
+# when using it from a `before(:context) { ... }` block this will load the
+# tasks more than once and therefore run tasks more often than they should ...
+Rails.application.load_tasks