--- a
+++ b/test/features/test_dep_feature.py
@@ -0,0 +1,83 @@
+# Base Dependencies
+# ----------------
+import pytest
+import numpy as np
+
+# Local Dependencies
+# ------------------
+from features.dep_feature import DEPFeature
+from models import RelationCollection, Entity
+from models.relation import Relation, RelationN2C2
+
+# Constants
+# ---------
+from constants import DEP_TAGS
+
+
+# Tests
+# ------
+def test_dep_init():
+    dep = DEPFeature()
+    assert isinstance(dep, DEPFeature)
+    assert dep.padding_idx is None
+
+
+def test_dep_get_feature_names():
+    dep = DEPFeature()
+    assert dep.get_feature_names() == ["DEP"]
+
+
+def test_dep_fit(n2c2_small_collection):
+    dep = DEPFeature()
+    dep = dep.fit(n2c2_small_collection)
+    assert isinstance(dep, DEPFeature)
+
+
+def test_dep_index():
+    for padding_idx in [0, 1, 5]:
+        dep = DEPFeature(padding_idx=padding_idx)
+
+        for tag in DEP_TAGS:
+            idx = dep.dep_index(tag)
+            assert idx != padding_idx
+
+
+def test_dep_index_unknown_tag_raises():
+    dep = DEPFeature()
+    with pytest.raises(Exception):
+        idx = dep.dep_index("B-UNKN")
+
+
+def test_dep_create_dep_feature_dimensions(n2c2_small_collection, NLP):
+    RelationCollection.set_nlp(NLP)
+
+    dep = DEPFeature()
+    dep_feature = dep.create_dep_feature(n2c2_small_collection)
+    assert len(dep_feature) == len(n2c2_small_collection)
+
+    for i in range(len(n2c2_small_collection)):
+        assert len(dep_feature[i]) == len(n2c2_small_collection.tokens[i])
+
+
+def test_dep_create_dep_feature_values(relation, NLP):
+    RelationCollection.set_nlp(NLP)
+
+    one_collection = RelationCollection(relation)
+
+    dep = DEPFeature()
+    dep_feature = dep.create_dep_feature(one_collection)
+    dep_tags = [
+        "nsubjpass",
+        "auxpass",
+        "ROOT",
+        "compound",
+        "cc",
+        "conj",
+        "nummod",
+        "dobj",
+        "case",
+        "nummod",
+        "nmod",
+    ]
+    dep_idx = [dep.dep_index(t) for t in dep_tags]
+    assert dep_feature[0] == dep_idx