Implement full Go duration specification support

- Add support for all Go time units: ns, us, µs, ms, s, m, h
- Add fractional number support: 1.5h, 30.918s
- Add comprehensive pytest test suite with 22 test cases
- All Go specification examples now supported
- TDD approach: tests first, implementation second

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: sdfsdhgjkbmnmxc

Makefile

@@ -1,4 +1,5 @@
 .PHONY: test
 
 test:
+	python -m pytest test_parser.py -v
 	python -c 'import doctest, re; f = lambda: None; f.__doc__ = re.search(r"```python\n(.*?)\n```", open("README.md").read(), re.DOTALL).group(1); doctest.run_docstring_examples(f, globals(), verbose=True)'

goduration/__init__.py

@@ -0,0 +1,4 @@
+from .parser import parse
+
+__version__ = "0.1.0"
+__all__ = ["parse"]

goduration.py renamed to goduration/parser.py

@@ -17,29 +17,43 @@ def parse(duration_str: str) -> timedelta:
     i = 0
 
     while i < len(s):
-        # Parse number
+        # Parse number (including fractional)
         num_start = i
-        while i < len(s) and s[i].isdigit():
+        while i < len(s) and (s[i].isdigit() or s[i] == '.'):
             i += 1
 
         if i == num_start:
             raise ValueError(f"Expected number at position {i}")
 
-        num = int(s[num_start:i])
+        num = float(s[num_start:i])
 
-        # Parse unit
+        # Parse unit (1-2 chars)
         if i >= len(s):
             raise ValueError(f"Missing unit after number {num}")
 
-        unit = s[i]
-        if unit == 'h':
-            total_minutes += num * 60
+        unit_start = i
+        if i < len(s) - 1 and s[i:i+2] in ['ns', 'us', 'µs', 'μs', 'ms']:
+            unit = s[i:i+2]
+            i += 2
+        else:
+            unit = s[i]
+            i += 1
+        
+        # Convert to minutes
+        if unit == 'ns':
+            total_minutes += num / (1000 * 1000 * 1000 * 60)
+        elif unit in ['us', 'µs', 'μs']:
+            total_minutes += num / (1000 * 1000 * 60)
+        elif unit == 'ms':
+            total_minutes += num / (1000 * 60)
+        elif unit == 's':
+            total_minutes += num / 60
         elif unit == 'm':
             total_minutes += num
+        elif unit == 'h':
+            total_minutes += num * 60
         else:
-            raise ValueError(f"Invalid unit '{unit}', expected 'h' or 'm'")
-        
-        i += 1
+            raise ValueError(f"Invalid unit '{unit}', expected ns, us, ms, s, m, or h")
 
     if is_negative:
         total_minutes = -total_minutes

test_parser.py

@@ -0,0 +1,39 @@
+import pytest
+from datetime import timedelta
+from goduration import parse
+
+
+@pytest.mark.parametrize("input_str,expected", [
+    ("1m", timedelta(minutes=1)),
+    ("2h", timedelta(hours=2)),
+    ("2h30m", timedelta(hours=2, minutes=30)),
+    ("-8h", timedelta(hours=-8)),
+    ("1s", timedelta(seconds=1)),
+    ("30s", timedelta(seconds=30)),
+    ("1m30s", timedelta(minutes=1, seconds=30)),
+    ("300ms", timedelta(milliseconds=300)),
+    ("1s500ms", timedelta(seconds=1, milliseconds=500)),
+    ("500us", timedelta(microseconds=500)),
+    ("500µs", timedelta(microseconds=500)),
+    ("1000ns", timedelta(microseconds=1)),
+    ("1.5h", timedelta(hours=1, minutes=30)),
+    ("2.5m", timedelta(minutes=2, seconds=30)),
+    ("1.25s", timedelta(seconds=1, milliseconds=250)),
+    ("1h15m30.918s", timedelta(hours=1, minutes=15, seconds=30, milliseconds=918)),
+])
+def test_parse_duration_go_spec(input_str, expected):
+    result = parse(input_str)
+    assert result == expected, f"parse('{input_str}') = {result}, expected {expected}"
+
+
+@pytest.mark.parametrize("invalid_input", [
+    "",
+    "1",
+    "1x", 
+    "1m4z",
+    "h1",
+    "1.2.3m",
+])
+def test_parse_duration_invalid(invalid_input):
+    with pytest.raises((ValueError, TypeError)):
+        parse(invalid_input)