1 files changed, 38 insertions, 0 deletions
diff --git a/spec/lib/gitlab/string_placeholder_replacer_spec.rb b/spec/lib/gitlab/string_placeholder_replacer_spec.rb
new file mode 100644
index 00000000000..7a03ea4154c
--- /dev/null
+++ b/spec/lib/gitlab/string_placeholder_replacer_spec.rb
@@ -0,0 +1,38 @@
+require 'spec_helper'
+
+describe Gitlab::StringPlaceholderReplacer do
+  describe '.render_url' do
+    it 'returns the nil if the string is blank' do
+      expect(described_class.replace_string_placeholders(nil, /whatever/)).to be_blank
+    end
+
+    it 'returns the string if the placeholder regex' do
+      expect(described_class.replace_string_placeholders('whatever')).to eq 'whatever'
+    end
+
+    it 'returns the string if no block given' do
+      expect(described_class.replace_string_placeholders('whatever', /whatever/)).to eq 'whatever'
+    end
+
+    context 'when all params are valid' do
+      let(:string) { '%{path}/%{id}/%{branch}' }
+      let(:regex) { /(path|id)/ }
+
+      it 'replaces each placeholders with the block result' do
+        result = described_class.replace_string_placeholders(string, regex) do |arg|
+          'WHATEVER'
+        end
+
+        expect(result).to eq 'WHATEVER/WHATEVER/%{branch}'
+      end
+
+      it 'does not replace the placeholder if the block result is nil' do
+        result = described_class.replace_string_placeholders(string, regex) do |arg|
+          arg == 'path' ? nil : 'WHATEVER'
+        end
+
+        expect(result).to eq '%{path}/WHATEVER/%{branch}'
+      end
+    end
+  end
+end