new_contents: # ------------------------------------------------
  # built-ins
  import unittest
  
  # local
  from .base import TestPostgapBase
  # ------------------------------------------------
  
  class TestPostgapPerLdSnpANDGwasSnp(TestPostgapBase):
  
      def setUp(self):
          self.per_ld_snp_and_gwas_snp = self.pg.groupby(['ld_snp_rsID', 'gwas_snp'])
  
      def test_each_ld_snp_rsID_and_gwas_snp_pair_has_unique_r2(self):
          self.assert_groupby_series_is_unique_per_group(
              self.per_ld_snp_and_gwas_snp.r2
          )
  
  
  if __name__ == '__main__':
      unittest.main()
  
subject: Add test per ld snp and gwas snp