1 files changed, 167 insertions, 0 deletions
diff --git a/gerber/tests/test_utils.py b/gerber/tests/test_utils.py
new file mode 100644
index 0000000..68484d1
--- /dev/null
+++ b/gerber/tests/test_utils.py
@@ -0,0 +1,167 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Author: Hamilton Kibbe <ham@hamiltonkib.be>
+
+import pytest
+from ..utils import *
+
+
+def test_zero_suppression():
+    """ Test gerber value parser and writer handle zero suppression correctly.
+    """
+    # Default format
+    fmt = (2, 5)
+
+    # Test leading zero suppression
+    zero_suppression = "leading"
+    test_cases = [
+        ("1", 0.00001),
+        ("10", 0.0001),
+        ("100", 0.001),
+        ("1000", 0.01),
+        ("10000", 0.1),
+        ("100000", 1.0),
+        ("1000000", 10.0),
+        ("-1", -0.00001),
+        ("-10", -0.0001),
+        ("-100", -0.001),
+        ("-1000", -0.01),
+        ("-10000", -0.1),
+        ("-100000", -1.0),
+        ("-1000000", -10.0),
+        ("0", 0.0),
+    ]
+    for string, value in test_cases:
+        assert value == parse_gerber_value(string, fmt, zero_suppression)
+        assert string == write_gerber_value(value, fmt, zero_suppression)
+
+    # Test trailing zero suppression
+    zero_suppression = "trailing"
+    test_cases = [
+        ("1", 10.0),
+        ("01", 1.0),
+        ("001", 0.1),
+        ("0001", 0.01),
+        ("00001", 0.001),
+        ("000001", 0.0001),
+        ("0000001", 0.00001),
+        ("-1", -10.0),
+        ("-01", -1.0),
+        ("-001", -0.1),
+        ("-0001", -0.01),
+        ("-00001", -0.001),
+        ("-000001", -0.0001),
+        ("-0000001", -0.00001),
+        ("0", 0.0),
+    ]
+    for string, value in test_cases:
+        assert value == parse_gerber_value(string, fmt, zero_suppression)
+        assert string == write_gerber_value(value, fmt, zero_suppression)
+
+    assert write_gerber_value(0.000000001, fmt, "leading") == "0"
+    assert write_gerber_value(0.000000001, fmt, "trailing") == "0"
+
+
+def test_format():
+    """ Test gerber value parser and writer handle format correctly
+    """
+    zero_suppression = "leading"
+    test_cases = [
+        ((2, 7), "1", 0.0000001),
+        ((2, 6), "1", 0.000001),
+        ((2, 5), "1", 0.00001),
+        ((2, 4), "1", 0.0001),
+        ((2, 3), "1", 0.001),
+        ((2, 2), "1", 0.01),
+        ((2, 1), "1", 0.1),
+        ((2, 7), "-1", -0.0000001),
+        ((2, 6), "-1", -0.000001),
+        ((2, 5), "-1", -0.00001),
+        ((2, 4), "-1", -0.0001),
+        ((2, 3), "-1", -0.001),
+        ((2, 2), "-1", -0.01),
+        ((2, 1), "-1", -0.1),
+        ((2, 6), "0", 0),
+    ]
+    for fmt, string, value in test_cases:
+        assert value == parse_gerber_value(string, fmt, zero_suppression)
+        assert string == write_gerber_value(value, fmt, zero_suppression)
+
+    zero_suppression = "trailing"
+    test_cases = [
+        ((6, 5), "1", 100000.0),
+        ((5, 5), "1", 10000.0),
+        ((4, 5), "1", 1000.0),
+        ((3, 5), "1", 100.0),
+        ((2, 5), "1", 10.0),
+        ((1, 5), "1", 1.0),
+        ((6, 5), "-1", -100000.0),
+        ((5, 5), "-1", -10000.0),
+        ((4, 5), "-1", -1000.0),
+        ((3, 5), "-1", -100.0),
+        ((2, 5), "-1", -10.0),
+        ((1, 5), "-1", -1.0),
+        ((2, 5), "0", 0),
+    ]
+    for fmt, string, value in test_cases:
+        assert value == parse_gerber_value(string, fmt, zero_suppression)
+        assert string == write_gerber_value(value, fmt, zero_suppression)
+
+
+def test_decimal_truncation():
+    """ Test decimal_string truncates value to the correct precision
+    """
+    value = 1.123456789
+    for x in range(10):
+        result = decimal_string(value, precision=x)
+        calculated = "1." + "".join(str(y) for y in range(1, x + 1))
+        assert result == calculated
+
+
+def test_decimal_padding():
+    """ Test decimal_string padding
+    """
+    value = 1.123
+    assert decimal_string(value, precision=3, padding=True) == "1.123"
+    assert decimal_string(value, precision=4, padding=True) == "1.1230"
+    assert decimal_string(value, precision=5, padding=True) == "1.12300"
+    assert decimal_string(value, precision=6, padding=True) == "1.123000"
+    assert decimal_string(0, precision=6, padding=True) == "0.000000"
+
+
+def test_parse_format_validation():
+    """ Test parse_gerber_value() format validation
+    """
+    pytest.raises(ValueError, parse_gerber_value, "00001111", (7, 5))
+    pytest.raises(ValueError, parse_gerber_value, "00001111", (5, 8))
+    pytest.raises(ValueError, parse_gerber_value, "00001111", (13, 1))
+
+
+def test_write_format_validation():
+    """ Test write_gerber_value() format validation
+    """
+    pytest.raises(ValueError, write_gerber_value, 69.0, (7, 5))
+    pytest.raises(ValueError, write_gerber_value, 69.0, (5, 8))
+    pytest.raises(ValueError, write_gerber_value, 69.0, (13, 1))
+
+
+def test_detect_format_with_short_file():
+    """ Verify file format detection works with short files
+    """
+    assert "unknown" == detect_file_format("gerber/tests/__init__.py")
+
+
+def test_validate_coordinates():
+    pytest.raises(TypeError, validate_coordinates, 3)
+    pytest.raises(TypeError, validate_coordinates, 3.1)
+    pytest.raises(TypeError, validate_coordinates, "14")
+    pytest.raises(TypeError, validate_coordinates, (0,))
+    pytest.raises(TypeError, validate_coordinates, (0, 1, 2))
+    pytest.raises(TypeError, validate_coordinates, (0, "string"))
+
+
+def test_convex_hull():
+    points = [(0, 0), (1, 0), (1, 1), (0.5, 0.5), (0, 1), (0, 0)]
+    expected = [(0, 0), (1, 0), (1, 1), (0, 1), (0, 0)]
+    assert set(convex_hull(points)) == set(expected)