diff --git a/src/kyupy/atalanta.py b/src/kyupy/atalanta.py
new file mode 100644
index 0000000..f101299
--- /dev/null
+++ b/src/kyupy/atalanta.py
@@ -0,0 +1,64 @@
+"""A parser and dumper for Atalanta's plain-text test pattern format (*.test).
+
+A *.test file contains one test pattern per line in the form ``<index>: <bits>``,
+where ``<bits>`` is a string of ``'0'`` and ``'1'`` characters giving the values of
+the primary inputs (in circuit order). Lines starting with ``'*'`` are comments.
+
+This parser also accepts files without ``<index>:`` and patterns elements in 8-valued
+logic such as ``'R'``, ``'F'``, ``'X'``.
+"""
+
+import re
+
+import numpy as np
+
+from . import readtext, logic
+from .circuit import Circuit
+
+_pattern_re = re.compile(r'^\s*(?:\d+:\s*)?([01HLRFX-]+)\s*$')
+
+
+class TestFile:
+    """Intermediate representation of a *.test pattern file.
+
+    :param text: The contents of a *.test file.
+    """
+
+    def __init__(self, text: str):
+        patterns = []
+        for line in text.splitlines():
+            if (m := _pattern_re.match(line)) is not None:
+                patterns.append(logic.mvarray(m.group(1)))
+
+        self.patterns = np.stack(patterns, axis=-1) if patterns \
+            else np.zeros((0, 0), dtype=np.uint8)
+        """The parsed patterns as a mvarray (see :py:mod:`~kyupy.logic`).
+
+        The second-to-last axis goes along primary inputs, the last axis goes along patterns.
+        """
+
+    def tests(self, circuit: Circuit):
+        """Assembles and returns the test pattern set for the given circuit.
+
+        :param circuit: The circuit to assemble the patterns for. The patterns will follow the
+            :py:attr:`~kyupy.circuit.Circuit.io_nodes` ordering of the circuit.
+        :return: A logic array (see :py:mod:`~kyupy.logic`). The values for primary inputs are
+            filled, all other values are left unassigned.
+        """
+        pi_locs = [i for i, n in enumerate(circuit.io_nodes) if len(n.ins) == 0]
+        tests = np.full((len(circuit.io_nodes), self.patterns.shape[-1]), logic.UNASSIGNED, dtype=np.uint8)
+        tests[pi_locs] = self.patterns
+        return tests
+
+
+def parse(text) -> TestFile:
+    """Parses the given ``text`` and returns a :class:`TestFile` object."""
+    return TestFile(text)
+
+
+def load(file) -> TestFile:
+    """Parses the contents of ``file`` and returns a :class:`TestFile` object.
+
+    Files with `.gz`-suffix are decompressed on-the-fly.
+    """
+    return parse(readtext(file))
diff --git a/tests/test_atalanta.py b/tests/test_atalanta.py
new file mode 100644
index 0000000..8fd2c58
--- /dev/null
+++ b/tests/test_atalanta.py
@@ -0,0 +1,29 @@
+import numpy as np
+
+from kyupy import atalanta, logic
+
+
+def test_parse():
+    text = '\n'.join([
+        '* Test pattern file',
+        '1: 0011',
+        '2: 1100',
+        '1010',
+    ])
+    tf = atalanta.parse(text)
+
+    # second-to-last axis = inputs, last axis = patterns
+    assert tf.patterns.shape == (4, 3)
+    assert tf.patterns.dtype == np.uint8
+    assert set(np.unique(tf.patterns)) <= {logic.ZERO, logic.ONE}
+
+    # patterns are stored along the last axis
+    assert list(tf.patterns[:, 0]) == [logic.ZERO, logic.ZERO, logic.ONE, logic.ONE]
+    assert list(tf.patterns[:, 1]) == [logic.ONE, logic.ONE, logic.ZERO, logic.ZERO]
+    assert list(tf.patterns[:, 2]) == [logic.ONE, logic.ZERO, logic.ONE, logic.ZERO]
+
+
+def test_empty():
+    tf = atalanta.parse('* only comments\n* nothing else\n')
+    assert tf.patterns.shape == (0, 0)
+    assert tf.patterns.dtype == np.uint8