added failing test for loading Dataset and then training predictor

test/test_class1_binding_predictor_A0205.py

+from mhcflurry.dataset import Dataset
+from mhcflurry.paths import CLASS1_DATA_CSV_PATH
+from mhcflurry import Class1BindingPredictor
+
+from nose.tools import eq_
+import numpy as np
+
+
+def class1_binding_predictor_A0205_training_accuracy():
+
+    dataset = Dataset.from_csv(CLASS1_DATA_CSV_PATH)
+    dataset_a0205 = dataset.get_allele("HLA-A0205")
+
+    predictor = Class1BindingPredictor.from_hyperparameters(name="A0205")
+    predictor.fit_dataset(dataset_a0205)
+    peptides = dataset_a0205.peptides
+    ic50_pred = predictor.predict(peptides)
+    ic50_true = dataset_a0205.affinities
+    eq_(len(ic50_pred), len(ic50_true))
+    assert np.allclose(ic50_pred, ic50_true)
+
+if __name__ == "__main__":
+    class1_binding_predictor_A0205_training_accuracy()