WIP: add unit tests

Author: jkittner

.coveragerc

@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: 2021 Jonas Kittner
+#
+# SPDX-License-Identifier: Unlicense
+[run]
+plugins = covdefaults
+
+[report]
+fail_under = 1

requirements-dev.txt

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+# SPDX-FileCopyrightText: 2021 Jonas Kittner
+#
+# SPDX-License-Identifier: Unlicense
+covdefaults
+coverage
+pytest

tests/__init__.py

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+# pylint: disable=missing-function-docstring,missing-module-docstring
+
+# SPDX-FileCopyrightText: 2021 Jonas Kittner
+#
+# SPDX-License-Identifier: MIT
+import pytest
+
+from adafruit_gps import _parse_degrees
+from adafruit_gps import _parse_int
+from adafruit_gps import _parse_float
+from adafruit_gps import _read_degrees
+from adafruit_gps import _parse_talker
+
+
+@pytest.mark.parametrize(
+    ("val", "exp"),
+    (
+        pytest.param("0023.456", 0.390933, id="leading zero"),
+        pytest.param("6413.9369", 64.23228, id="regular value"),
+        pytest.param("2747.416122087989", 27.79027, id="long value"),
+    ),
+)
+def test_parse_degrees(val, exp):
+    assert _parse_degrees(val) == pytest.approx(exp)
+
+
+def test_parse_degrees_too_short():
+    assert _parse_degrees("12") is None
+
+
+def test_parse_int():
+    assert _parse_int("456") == 456
+
+
+@pytest.mark.parametrize(
+    "val",
+    (None, ""),
+)
+def test_parse_int_invalid(val):
+    assert _parse_int(val) is None
+
+
+def test_parse_float():
+    assert _parse_float("456") == 456
+
+
+@pytest.mark.parametrize(
+    "val",
+    (None, ""),
+)
+def test_parse_float_invalid(val):
+    assert _parse_float(val) is None
+
+
+@pytest.mark.parametrize(
+    ("data", "neg", "exp"),
+    (
+        pytest.param([27.79027, "S"], "s", -27.79027, id="south negative"),
+        pytest.param([64.23228, "N"], "s", 64.23228, id="north not negative"),
+        pytest.param([123.4567, "W"], "w", -123.4567, id="west negative"),
+        pytest.param([10.7891, "E"], "w", 10.7891, id="east not negative"),
+    ),
+)
+def test_read_degrees(data, neg, exp):
+    assert _read_degrees(data, 0, neg) == exp
+
+
+def test_parse_talker_prop_code():
+    assert _parse_talker(b"PMTK001") == (b"P", b"MTK001")
+
+
+def test_parse_talker_regular():
+    assert _parse_talker(b"GPRMC") == (b"GP", b"RMC")