Fix issue with invisible chars (#107)

Author: tracyloisel

lib/csv_importer/header.rb

@@ -9,6 +9,9 @@ class Header
 
     def columns
       column_names.map do |column_name|
+        # ensure column name escapes invisible characters
+        column_name = column_name.gsub(/[^[:print:]]/, '')
+
         Column.new(
           name: column_name,
           definition: find_column_definition(column_name)

spec/csv_importer_spec.rb

@@ -425,6 +425,19 @@ class ImportUserCSVByFirstName
     expect { import.run! }.to_not raise_error
   end
 
+  it "supports invisible characters" do
+    csv_content = "Email,Confirmed,First name,last_name
+bob@example.com   ,  true,   bob   ,,"
+
+    # insert invisible characters
+    csv_content.insert(-1, "\u{FEFF}")
+
+    csv_io = StringIO.new(csv_content)
+    import = ImportUserCSV.new(file: csv_io)
+
+    expect { import.run! }.to_not raise_error
+  end
+
   it "imports from a path" do
     import = ImportUserCSV.new(path: "spec/fixtures/valid_csv.csv")