diff --git a/tests/core/classifiers/test_demarque.py b/tests/core/classifiers/test_demarque.py
new file mode 100644
index 000000000..ec74dcf4f
--- /dev/null
+++ b/tests/core/classifiers/test_demarque.py
@@ -0,0 +1,51 @@
+from core.classifier import DeMarqueClassifier
+
+
+class MockSubject:
+    def __init__(self, identifier, name):
+        self.identifier = identifier
+        self.name = name
+
+
+class TestDeMarqueClassifier:
+    def _subject(self, identifier, name):
+        subject = MockSubject(identifier, name)
+        (
+            subject.genre,
+            subject.audience,
+            subject.target_age,
+            subject.fiction,
+        ) = DeMarqueClassifier.classify(subject)
+        return subject
+
+    def test_scrub_identifier(self):
+        """Make sure that the identifier matches with De Marque codes."""
+        assert "READ0000" == DeMarqueClassifier.scrub_identifier("READ0000")
+
+        # Otherwise, the identifier is left alone.
+        assert "RRRR0000" != DeMarqueClassifier.scrub_identifier("RRRR0000")
+
+    def test_scrub_name(self):
+        """Sometimes a data provider sends BISAC names that contain extra or
+        nonstandard characters. We store the data as it was provided to us,
+        but when it's time to classify things, we normalize it.
+        """
+        assert "Early childhood" == DeMarqueClassifier.scrub_name("Early childhood")
+
+    def test_audience(self):
+        """Test that the correct audience is returned for each identifier."""
+        assert "Children" == DeMarqueClassifier.audience("READ0001", "Early childhood")
+        assert "Children" == DeMarqueClassifier.audience("READ0002", "Beginner reader")
+        assert "Children" == DeMarqueClassifier.audience("READ0003", "Advanced reader")
+        assert "Young Adult" == DeMarqueClassifier.audience("READ0004", "Teen")
+        assert "Young Adult" == DeMarqueClassifier.audience("READ0005", "Young adult")
+        assert "Adult" == DeMarqueClassifier.audience("READ0000", "Adult")
+
+    def test_target_age(self):
+        """Test that the correct target age range is returned for each identifier. Adult books do not have a target age
+        range."""
+        assert (0, 3) == DeMarqueClassifier.target_age("READ0001", "Early childhood")
+        assert (4, 7) == DeMarqueClassifier.target_age("READ0002", "Beginner reader")
+        assert (8, 12) == DeMarqueClassifier.target_age("READ0003", "Advanced reader")
+        assert (13, 18) == DeMarqueClassifier.target_age("READ0004", "Teen")
+        assert (17, None) == DeMarqueClassifier.target_age("READ0005", "Young Adult")
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