1 files changed, 71 insertions, 0 deletions
diff --git a/spec/helpers/time_zone_helper_spec.rb b/spec/helpers/time_zone_helper_spec.rb
new file mode 100644
index 00000000000..391e9bd38ed
--- /dev/null
+++ b/spec/helpers/time_zone_helper_spec.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe TimeZoneHelper, :aggregate_failures do
+  describe '#timezone_data' do
+    context 'with short format' do
+      subject(:timezone_data) { helper.timezone_data }
+
+      it 'matches schema' do
+        expect(timezone_data).not_to be_empty
+
+        timezone_data.each_with_index do |timezone_hash, i|
+          expect(timezone_hash.keys).to contain_exactly(
+            :identifier,
+            :name,
+            :offset
+          ), "Failed at index #{i}"
+        end
+      end
+
+      it 'formats for display' do
+        tz = ActiveSupport::TimeZone.all[0]
+
+        expect(timezone_data[0]).to eq(
+          identifier: tz.tzinfo.identifier,
+          name: tz.name,
+          offset: tz.now.utc_offset
+        )
+      end
+    end
+
+    context 'with full format' do
+      subject(:timezone_data) { helper.timezone_data(format: :full) }
+
+      it 'matches schema' do
+        expect(timezone_data).not_to be_empty
+
+        timezone_data.each_with_index do |timezone_hash, i|
+          expect(timezone_hash.keys).to contain_exactly(
+            :identifier,
+            :name,
+            :abbr,
+            :offset,
+            :formatted_offset
+          ), "Failed at index #{i}"
+        end
+      end
+
+      it 'formats for display' do
+        tz = ActiveSupport::TimeZone.all[0]
+
+        expect(timezone_data[0]).to eq(
+          identifier: tz.tzinfo.identifier,
+          name: tz.name,
+          abbr: tz.tzinfo.strftime('%Z'),
+          offset: tz.now.utc_offset,
+          formatted_offset: tz.now.formatted_offset
+        )
+      end
+    end
+
+    context 'with unknown format' do
+      subject(:timezone_data) { helper.timezone_data(format: :unknown) }
+
+      it 'raises an exception' do
+        expect { timezone_data }.to raise_error ArgumentError, 'Invalid format :unknown. Valid formats are :short, :full.'
+      end
+    end
+  end
+end