old_contents: import pytest
  import os
  from locuspocus import Locus
  from locuspocus import Loci
  
  @pytest.fixture(scope='module')
  def simpleLoci():
      # Create a Locus
      a = Locus(1,100,150, id='gene_a')
      # Create a couple more!
      b = Locus(1,160,175, id='gene_b')
      c = Locus(1,180,200, id='gene_c')
      d = Locus(1,210,300, id='gene_d')
      e = Locus(2,100,150, id='gene_e')
  
      x = Loci('simpleLoci')
      x.add_loci([a,b,c,d,e])
      return x
  
  @pytest.fixture(scope="module")
  def testRefGen():
      # We have to build it
      gff = os.path.expanduser(
          os.path.join(
              'raw', 'ZmB73_5b_FGS.gff.gz'
          )
      )
      x = Loci('Zm5bFGS')
      if len(x) == 0:
          x.add_gff(  
              gff
          )
      return x
  
  
  
new_contents: import pytest
  import os
  from locuspocus import Locus
  from locuspocus import Loci
  from locuspocus import Fasta
  
  from locuspocus.Fasta import Chromosome
  
  @pytest.fixture(scope='module')
  def simpleLoci():
      # Create a Locus
      a = Locus(1,100,150, id='gene_a')
      # Create a couple more!
      b = Locus(1,160,175, id='gene_b')
      c = Locus(1,180,200, id='gene_c')
      d = Locus(1,210,300, id='gene_d')
      e = Locus(2,100,150, id='gene_e')
  
      x = Loci('simpleLoci')
      x.add_loci([a,b,c,d,e])
      return x
  
  @pytest.fixture(scope="module")
  def testRefGen():
      # We have to build it
      gff = os.path.expanduser(
          os.path.join(
              'raw', 'ZmB73_5b_FGS.gff.gz'
          )
      )
      x = Loci('Zm5bFGS')
      if len(x) == 0:
          x.add_gff(  
              gff
          )
      return x
  
  @pytest.fixture()                                                               
  def smpl_fasta():                                                                  
      ''' A simple fasta that agrees with smpl_annot'''                           
      fasta = Fasta()                                                             
      chr1 = Chromosome('A'*500000)                                                  
      chr2 = Chromosome('C'*500000)                                               
      chr3 = Chromosome('G'*500000)                                               
      chr4 = Chromosome('T'*500000)                                                  
      fasta.add_chrom('chr1',chr1)                                                
      fasta.add_chrom('chr2',chr2)                                                
      fasta.add_chrom('chr3',chr3)                                                
      fasta.add_chrom('chr4',chr4)                                                
      return fasta  
  
subject: add fixture for Fasta