docstr: Test single motif detection
docstr_tok: ["Test","single","motif","detection"]
code: def test_single_motif_detection(self):
      "Test single motif detection"
      params = {
          "motif_name": "TAL1_known4",
          "seq_length": 1000,
          "num_pos": 30,
          "num_neg": 30,
          "GC_fraction": 0.4,
      }
      sequences, y, embed = dc.molnet.simulate_single_motif_detection(
          **params
      )
      assert sequences.shape == (60,)
      assert y.shape == (60, 1)
  
file_path: deepchem/deepchem/molnet/tests/test_dnasim.py
imports: import deepchem
  import unittest
label_desc: Use image node_id 5 for calling the TestDNASim obj's underlying member method code with example usage: obj.test_single_motif_detection() without return types