Send email even if there was an exception in Preparsing

app/workers/preparsing.rb

@@ -110,6 +110,7 @@ def perform(genotype_id)
       file_has_mails = true
     end
 
+  ensure
     # not proper file!
     if not file_is_ok
       if file_is_duplicate

spec/workers/preparsing_spec.rb

@@ -0,0 +1,19 @@
+RSpec.describe Preparsing do
+  subject(:worker) { described_class.new }
+
+  let!(:genotype) do
+    create(
+      :genotype,
+      genotype: Rails.root.join("spec/fixtures/files/broken_genotype_file.gz").open
+    )
+  end
+
+  it "handles errors" do
+    expect { worker.perform(genotype.id) }
+      .to raise_error(ArgumentError, "invalid byte sequence in UTF-8")
+
+    expect(ActionMailer::Base.deliveries.count).to eq(1)
+    expect(ActionMailer::Base.deliveries.last.subject)
+      .to eq("openSNP.org: Something went wrong while parsing")
+  end
+end