1 files changed, 41 insertions, 0 deletions
diff --git a/spec/helpers/safe_format_helper_spec.rb b/spec/helpers/safe_format_helper_spec.rb
new file mode 100644
index 00000000000..ced48b0c9c1
--- /dev/null
+++ b/spec/helpers/safe_format_helper_spec.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe SafeFormatHelper, feature_category: :shared do
+  describe '#safe_format' do
+    shared_examples 'safe formatting' do |format, args:, result:|
+      subject { helper.safe_format(format, **args) }
+
+      it { is_expected.to eq(result) }
+      it { is_expected.to be_html_safe }
+    end
+
+    it_behaves_like 'safe formatting', '', args: {}, result: ''
+    it_behaves_like 'safe formatting', 'Foo', args: {}, result: 'Foo'
+
+    it_behaves_like 'safe formatting', '<b>strong</b>', args: {},
+      result: '&lt;b&gt;strong&lt;/b&gt;'
+
+    it_behaves_like 'safe formatting', '%{open}strong%{close}',
+      args: { open: '<b>'.html_safe, close: '</b>'.html_safe },
+      result: '<b>strong</b>'
+
+    it_behaves_like 'safe formatting', '%{open}strong%{close} %{user_input}',
+      args: { open: '<b>'.html_safe, close: '</b>'.html_safe,
+              user_input: '<a href="">link</a>' },
+      result: '<b>strong</b> &lt;a href=&quot;&quot;&gt;link&lt;/a&gt;'
+
+    context 'when format is marked as html_safe' do
+      let(:format) { '<b>strong</b>'.html_safe }
+      let(:args) { {} }
+
+      it 'raises an error' do
+        message = 'Argument `format` must not be marked as html_safe!'
+
+        expect { helper.safe_format(format, **args) }
+          .to raise_error ArgumentError, message
+      end
+    end
+  end
+end