Update tests

spec/update_changelog_action_spec.rb

@@ -57,12 +57,12 @@
       expect(read_result).to eq(post_update_read_result)
     end
 
-    it 'updates [Unreleased] section identifier without appending date' do
-      # Update [Unreleased] section identifier with new one
+    it 'updates [Unreleased] section identifier without appending a date' do
+      # Update [Unreleased] section identifier with new one - explicitly ask to not use a date.
       Fastlane::FastFile.new.parse("lane :test do
         update_changelog(changelog_path: '#{changelog_mock_path}',
                           updated_section_identifier: '#{updated_section_identifier}',
-                          append_date: false)
+                          append_datetime_format: nil)
       end").runner.execute(:test)
 
       # Read updated section line
@@ -80,12 +80,35 @@
       expect(modifiedSectionLine).to eq("## [12.34.56]\n")
     end
 
-    it 'updates [Unreleased] section identifier with appending date' do 
-      # Update [Unreleased] section identifier with new one
+    it 'updates [Unreleased] section identifier appending a date via the default datetime format' do
+      # Update [Unreleased] section identifier with new one via the default datetime format
+      Fastlane::FastFile.new.parse("lane :test do
+        update_changelog(changelog_path: '#{changelog_mock_path}',
+                         updated_section_identifier: '#{updated_section_identifier}')
+      end").runner.execute(:test)
+
+      # Read updated section line
+      modifiedSectionLine = ""
+      File.open(changelog_mock_path_hook, "r") do |file|
+        file.each_line do |line|
+            if line =~ /\#{2}\s?\[#{updated_section_identifier}\]/
+              modifiedSectionLine = line
+            break
+          end
+        end
+      end
+
+      # Expect the modified section line to be with current date
+      now = Time.now.utc.strftime("%FZ")
+      expect(modifiedSectionLine).to eq("## [12.34.56] - #{now}\n")
+    end
+
+    it 'updates [Unreleased] section identifier appending a date via a user specified datetime format' do
+      # Update [Unreleased] section identifier with new one via the user specified datetime format
       Fastlane::FastFile.new.parse("lane :test do
         update_changelog(changelog_path: '#{changelog_mock_path}',
                           updated_section_identifier: '#{updated_section_identifier}',
-                          append_date: true)
+                          append_datetime_format: '%FT:%TZ')
       end").runner.execute(:test)
 
       # Read updated section line
@@ -100,7 +123,7 @@
       end
 
       # Expect the modified section line to be with current date
-      now = Time.now.strftime("%Y-%m-%d")
+      now = Time.now.utc.strftime("%FT:%TZ")
       expect(modifiedSectionLine).to eq("## [12.34.56] - #{now}\n")
     end
   end