Coverage for tests / test_matplotlibFormatter.py: 46%

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27 

28"""Tests for MatplotlibFormatter.""" 

29 

30import os 

31import tempfile 

32import unittest 

33from random import Random 

34 

35try: 

36 import matplotlib 

37 

38 matplotlib.use("Agg") 

39 from matplotlib import pyplot 

40except ImportError: 

41 pyplot = None 

42 

43import filecmp 

44 

45from lsst.daf.butler import Butler, DatasetType 

46from lsst.daf.butler.tests.utils import makeTestTempDir, removeTestTempDir 

47 

48TESTDIR = os.path.abspath(os.path.dirname(__file__)) 

49 

50 

51@unittest.skipIf(pyplot is None, "skipping test because matplotlib import failed") 

52class MatplotlibFormatterTestCase(unittest.TestCase): 

53 """Test for MatplotlibFormatter.""" 

54 

55 RANDOM_SEED = 10 

56 

57 def setUp(self): 

58 self.root = makeTestTempDir(TESTDIR) 

59 Butler.makeRepo(self.root) 

60 # Create a random image for testing 

61 self.rng = Random(self.RANDOM_SEED) 

62 

63 def tearDown(self): 

64 removeTestTempDir(self.root) 

65 

66 def testMatplotlibFormatter(self): 

67 butler = Butler.from_config(self.root, run="testrun") 

68 self.enterContext(butler) 

69 datasetType = DatasetType("test_plot", [], "Plot", universe=butler.dimensions) 

70 butler.registry.registerDatasetType(datasetType) 

71 # Does not have to be a random image 

72 pyplot.imshow( 

73 [ 

74 self.rng.sample(range(50), 10), 

75 self.rng.sample(range(50), 10), 

76 self.rng.sample(range(50), 10), 

77 ] 

78 ) 

79 ref = butler.put(pyplot.gcf(), datasetType) 

80 uri = butler.getURI(ref) 

81 

82 # Following test needs a local file 

83 with uri.as_local() as local, tempfile.NamedTemporaryFile(suffix=".png") as file: 

84 pyplot.gcf().savefig(file.name) 

85 self.assertTrue(filecmp.cmp(local.ospath, file.name, shallow=True)) 

86 self.assertTrue(butler.exists(ref)) 

87 with self.assertRaises(ValueError): 

88 butler.get(ref) 

89 butler.pruneDatasets([ref], unstore=True, purge=True) 

90 self.assertFalse(butler.exists(ref)) 

91 

92 

93if __name__ == "__main__": 

94 unittest.main()