Add spec for deduplicate query identifier

spec/features/search_and_results_spec.rb

@@ -16,6 +16,10 @@ def nucleotide_query
     File.read File.join(__dir__, '..', 'sequences', 'protein_query.fa')
   end
 
+  let(:duplicated_query) do
+    File.read File.join(__dir__, '..', 'sequences', 'duplicated_query.fa')
+  end
+
   let(:funkyid_query) do
     'GATGAACGCTGGCGGCGTGCCTAATACATGCAAGTCGAG'
   end
@@ -193,6 +197,16 @@ def nucleotide_query
     expect(File.read(downloaded_file)).to eq(File.read('spec/sequences/funky_ids_download.fa'))
   end
 
+  it 'on download deduplicates by identifiers' do
+    perform_search(query: duplicated_query, databases: nucleotide_databases.values_at(1))
+
+    page.click_link('FASTA of all hits')
+    wait_for_download
+
+    expect(File.basename(downloaded_file)).to eq('sequenceserver-SI2.2.0_13722.fa')
+    expect(File.read(downloaded_file)).to eq(File.read('spec/sequences/sequenceserver-1_hit.fa'))
+  end
+
   it 'can download alignment for each hit' do
     # Do a BLASTP search. protein_query refers to the first two sequence in
     # protein_databases[0], so the top hits are the query sequences themselves.

spec/sequences/duplicated_query.fa

@@ -0,0 +1,22 @@
+>SI2.2.0_13722 Si_gnF.scaffold06207[1925625..1928536].pep_1
+ATGTCCGCGAATCGATTGAACGTGCTGGTGACCCTGATGCTCGCCGTCGCGCTTCTTGTG
+ACGGAATCAGGAAATGCACAGGTGGATGGCTATCTCCAATTCAACCCAAAGCGATCCGCC
+GTGAGCTCGCCGCAGAAGTATTGCGGCAAAAAGCTTTCTAATGCTCTACAGATAATCTGT
+GATGGCGTGTACAATTCCATGTTTAAGAAGAGTGGTCAAGATTTTCCCCCGCAAAATAAG
+AGACACATAGCACACAGAATAAATGGGAATGAGGAAGAGAGCTTTACTACGTTAAAGTCG
+AATTTTTTAAACTGGTGTGTTGAAGTTTATCATCGTCACTACAGATTCGTTTTTGTTTCA
+GAGATGGAAATGGCCGATTACCCGCTCGCCTATGATATTTCCCCGTATCTTCCGCCGTTC
+CTGTCGCGAGCGAGGGCACGGGGAATGTTAGACGGTCGCTTCGCCGGCAGACGCTACCGA
+AGGGAGTCGCGGGGCATTCACGAGGAGTGTTGCATCAACGGATGTACGATAAACGAATTG
+ACCAGCTACTGCGGCCCC
+>SI2.2.0_13722 Si_gnF.scaffold06207[1925625..1928536].pep_1
+ATGTCCGCGAATCGATTGAACGTGCTGGTGACCCTGATGCTCGCCGTCGCGCTTCTTGTG
+ACGGAATCAGGAAATGCACAGGTGGATGGCTATCTCCAATTCAACCCAAAGCGATCCGCC
+GTGAGCTCGCCGCAGAAGTATTGCGGCAAAAAGCTTTCTAATGCTCTACAGATAATCTGT
+GATGGCGTGTACAATTCCATGTTTAAGAAGAGTGGTCAAGATTTTCCCCCGCAAAATAAG
+AGACACATAGCACACAGAATAAATGGGAATGAGGAAGAGAGCTTTACTACGTTAAAGTCG
+AATTTTTTAAACTGGTGTGTTGAAGTTTATCATCGTCACTACAGATTCGTTTTTGTTTCA
+GAGATGGAAATGGCCGATTACCCGCTCGCCTATGATATTTCCCCGTATCTTCCGCCGTTC
+CTGTCGCGAGCGAGGGCACGGGGAATGTTAGACGGTCGCTTCGCCGGCAGACGCTACCGA
+AGGGAGTCGCGGGGCATTCACGAGGAGTGTTGCATCAACGGATGTACGATAAACGAATTG
+ACCAGCTACTGCGGCCCC

spec/sequences/sequenceserver-1_hit.fa

@@ -0,0 +1,11 @@
+>SI2.2.0_13722 Si_gnF.scaffold06207[1925625..1928536].pep_1
+ATGTCCGCGAATCGATTGAACGTGCTGGTGACCCTGATGCTCGCCGTCGCGCTTCTTGTG
+ACGGAATCAGGAAATGCACAGGTGGATGGCTATCTCCAATTCAACCCAAAGCGATCCGCC
+GTGAGCTCGCCGCAGAAGTATTGCGGCAAAAAGCTTTCTAATGCTCTACAGATAATCTGT
+GATGGCGTGTACAATTCCATGTTTAAGAAGAGTGGTCAAGATTTTCCCCCGCAAAATAAG
+AGACACATAGCACACAGAATAAATGGGAATGAGGAAGAGAGCTTTACTACGTTAAAGTCG
+AATTTTTTAAACTGGTGTGTTGAAGTTTATCATCGTCACTACAGATTCGTTTTTGTTTCA
+GAGATGGAAATGGCCGATTACCCGCTCGCCTATGATATTTCCCCGTATCTTCCGCCGTTC
+CTGTCGCGAGCGAGGGCACGGGGAATGTTAGACGGTCGCTTCGCCGGCAGACGCTACCGA
+AGGGAGTCGCGGGGCATTCACGAGGAGTGTTGCATCAACGGATGTACGATAAACGAATTG
+ACCAGCTACTGCGGCCCC