1 files changed, 16 insertions, 0 deletions
diff --git a/spec/services/file_service_spec.rb b/spec/services/file_service_spec.rb
new file mode 100644
index 000000000..90e164408
--- /dev/null
+++ b/spec/services/file_service_spec.rb
@@ -0,0 +1,16 @@
+RSpec.describe FileService do
+
+  it 'computes a unique filename' do
+    expect( File ).to receive(:exists?).with('xxx/yyy_0').and_return( false )
+
+    expect(described_class.unique_filename('xxx/yyy')).to eq('xxx/yyy_0')
+  end
+
+  it 'handles duplicate names by means of a counter' do
+    expect( File ).to receive(:exists?).with('xxx/yyy_0').and_return( true )
+    expect( File ).to receive(:exists?).with('xxx/yyy_1').and_return( true )
+    expect( File ).to receive(:exists?).with('xxx/yyy_2').and_return( false )
+
+    expect(described_class.unique_filename('xxx/yyy')).to eq('xxx/yyy_2')
+  end
+end