commit 7bea08ddac2ddd78dfd9e9305329c39b11d27897
Author: Jef Roosens <jefroosens@outlook.com>
Date:   Fri May 22 10:09:59 2026 +0200

    feat: set up modularized version of project with testing

diff --git a/.coverage b/.coverage
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Binary files /dev/null and b/.coverage differ
diff --git a/.gitignore b/.gitignore
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+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv
diff --git a/.python-version b/.python-version
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+++ b/.python-version
@@ -0,0 +1 @@
+3.13
diff --git a/AGENTS.md b/AGENTS.md
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+++ b/AGENTS.md
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+# Timesheets — Agent Guide
+
+## Project overview
+
+A Python CLI tool that parses markdown pipe-delimited timesheet tables and
+exports them to CSV for import into Odoo (or similar tools). It also supports
+a human-readable summary view.
+
+### Package layout
+
+```
+timesheets/
+├── pyproject.toml                  # package metadata, entry point, dev dependencies
+├── AGENTS.md
+└── src/timesheets/
+    ├── cli.py        # argument parsing, main() entry point
+    ├── parser.py     # markdown table parsing and row aggregation
+    ├── projects.py   # project_map.json loading and key resolution
+    ├── output.py     # CSV writing and summary printing
+    └── utils.py      # shared low-level helpers (duration parsing, formatting, etc.)
+```
+
+Tests live in `tests/`, one file per source module:
+
+```
+tests/
+├── test_utils.py
+├── test_parser.py
+├── test_projects.py
+└── test_output.py
+```
+
+---
+
+## Package manager — uv
+
+All dependency management and script execution is done via [`uv`](https://docs.astral.sh/uv/).
+Do **not** use `pip` or `python` directly.
+
+| Task | Command |
+|---|---|
+| Install / sync dependencies | `uv sync` |
+| Add a runtime dependency | `uv add <package>` |
+| Add a dev-only dependency | `uv add --dev <package>` |
+| Run the CLI | `uv run timesheets <args>` |
+| Run any Python script | `uv run python <script>` |
+
+---
+
+## CLI usage
+
+```sh
+# Print CSV to stdout (date defaults to today)
+uv run timesheets input.md
+
+# Write CSV to a file
+uv run timesheets input.md -o output.csv
+
+# Override the date (DD/MM/YY)
+uv run timesheets input.md --date 22/03/26
+
+# Use a specific project map file
+uv run timesheets input.md --map /path/to/project_map.json
+
+# Print a human-readable summary instead of CSV
+uv run timesheets input.md --summary
+
+# Read from stdin
+cat input.md | uv run timesheets -
+```
+
+`project_map.json` is auto-discovered in the current working directory if
+`--map` is not provided.
+
+---
+
+## Testing
+
+The test suite uses **pytest** with **pytest-cov** for coverage reporting.
+
+```sh
+# Run all tests
+uv run pytest
+
+# Run with coverage report
+uv run pytest --cov
+
+# Run a specific test file
+uv run pytest tests/test_parser.py
+
+# Run a specific test
+uv run pytest tests/test_parser.py::TestParseTable::test_empty_input
+```
+
+### Rules for adding or changing functionality
+
+1. **Always update or add tests** when introducing new behaviour or modifying
+   existing behaviour. Tests live in the `tests/` file that corresponds to the
+   module being changed (e.g. changes to `parser.py` → `tests/test_parser.py`).
+
+2. **Run the full test suite before finishing** and confirm it passes with no
+   failures:
+   ```sh
+   uv run pytest --cov
+   ```
+
+3. **Do not reduce coverage.** Every new function or branch should have at
+   least one test covering the happy path. Edge cases and error paths should be
+   covered where the logic is non-trivial.
+
+4. `cli.py` is intentionally excluded from unit tests — it is thin glue code.
+   All logic worth testing belongs in the other modules.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/project_map.json b/project_map.json
new file mode 100644
index 0000000..197f29e
--- /dev/null
+++ b/project_map.json
@@ -0,0 +1,57 @@
+{
+  "bugs": {
+    "Project": "[Factry] Historian Product Development",
+    "Task": "[Historian] Bugs"
+  },
+  "scrum": {
+    "Project": "[Factry] Historian Product Development",
+    "Task": "[Historian] SCRUM Meetings"
+  },
+  "office": {
+    "Project": "[Factry] Internal",
+    "Task": "Office Management"
+  },
+  "requests": {
+    "Project": "[Factry] Historian Product Development",
+    "Task": "[Historian] Incoming requests"
+  },
+  "internal": {
+    "Project": "[Factry] Internal"
+  },
+  "environ": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian] Environment Management"
+  },
+  "v8": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian][Feature] v8 - Release"
+  },
+  "refine": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian] Product refinement /26"
+  },
+  "ignition": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian][Feature] Ignition Module"
+  },
+  "e2e": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian] E2E Testing"
+  },
+  "tsdb": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian][Feature] Alernative TSDB"
+  },
+  "rate": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian][Feature] API Rate limiting | OpenAPI v3"
+  },
+  "hatch": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": "[Historian][Feature] Hatchry | MR previews"
+  },
+  "product": {
+      "Project": "[Factry] Historian Product Development",
+      "Task": ""
+  }
+}
diff --git a/pyproject.toml b/pyproject.toml
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index 0000000..d342ad5
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,32 @@
+[project]
+name = "timesheets"
+version = "0.1.0"
+description = "Parse markdown timesheet tables and export to CSV"
+readme = "README.md"
+authors = [
+    { name = "Jef Roosens", email = "roosenj@factry.io" }
+]
+requires-python = ">=3.13"
+dependencies = []
+
+[project.scripts]
+timesheets = "timesheets.cli:main"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+
+[tool.coverage.run]
+source = ["timesheets"]
+
+[tool.coverage.report]
+show_missing = true
+
+[build-system]
+requires = ["uv_build>=0.10.8,<0.11.0"]
+build-backend = "uv_build"
+
+[dependency-groups]
+dev = [
+    "pytest>=9.0.3",
+    "pytest-cov>=7.1.0",
+]
diff --git a/src/timesheets/__init__.py b/src/timesheets/__init__.py
new file mode 100644
index 0000000..ed32c05
--- /dev/null
+++ b/src/timesheets/__init__.py
@@ -0,0 +1,3 @@
+from .cli import main
+
+__all__ = ["main"]
diff --git a/src/timesheets/cli.py b/src/timesheets/cli.py
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--- /dev/null
+++ b/src/timesheets/cli.py
@@ -0,0 +1,85 @@
+import argparse
+import os
+import sys
+from datetime import date
+
+from .output import print_summary, write_csv
+from .parser import aggregate_rows, detect_has_duration_column, parse_table
+from .projects import load_project_map
+from .utils import format_date
+
+
+def build_parser() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser(
+        description="Parse a markdown timesheet table and output a CSV file."
+    )
+    parser.add_argument(
+        "input",
+        help="Path to the markdown file containing the timesheet table, or '-' to read from stdin.",
+    )
+    parser.add_argument(
+        "-o", "--output",
+        help="Path to the output CSV file. Defaults to stdout.",
+        default=None,
+    )
+    parser.add_argument(
+        "--date",
+        help="Date to use in the output (DD/MM/YY). Defaults to today.",
+        default=None,
+    )
+    parser.add_argument(
+        "--map",
+        help=(
+            "Path to a JSON file mapping project keys to Project+Task pairs. "
+            "Defaults to project_map.json in the current working directory if it exists."
+        ),
+        default=None,
+    )
+    parser.add_argument(
+        "--summary",
+        action="store_true",
+        help="Print a human-readable summary instead of writing CSV.",
+    )
+    return parser
+
+
+def main() -> None:
+    args = build_parser().parse_args()
+
+    date_str = args.date or format_date(date.today())
+
+    if args.input == "-":
+        content = sys.stdin.read()
+    else:
+        try:
+            with open(args.input, "r", encoding="utf-8") as f:
+                content = f.read()
+        except FileNotFoundError:
+            print(f"Error: file not found: {args.input}", file=sys.stderr)
+            sys.exit(1)
+
+    lines = content.splitlines()
+    rows = parse_table(lines, has_duration_col=detect_has_duration_column(lines))
+
+    if not rows:
+        print("Warning: no timesheet rows found in input.", file=sys.stderr)
+
+    aggregated = aggregate_rows(rows)
+
+    # Resolve project map: explicit --map flag, else project_map.json in cwd
+    map_path = args.map
+    if map_path is None:
+        default_map = os.path.join(os.getcwd(), "project_map.json")
+        if os.path.exists(default_map):
+            map_path = default_map
+
+    project_map = load_project_map(map_path)
+
+    if args.summary:
+        print_summary(aggregated, project_map)
+    elif args.output:
+        with open(args.output, "w", newline="", encoding="utf-8") as f:
+            write_csv(aggregated, f, date_str, project_map)
+        print(f"Written to {args.output}", file=sys.stderr)
+    else:
+        write_csv(aggregated, sys.stdout, date_str, project_map)
diff --git a/src/timesheets/output.py b/src/timesheets/output.py
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--- /dev/null
+++ b/src/timesheets/output.py
@@ -0,0 +1,54 @@
+import csv
+import sys
+from collections import OrderedDict
+from typing import IO
+
+from .projects import resolve_project_task
+from .utils import decimal_to_hhmm
+
+
+def write_csv(
+    aggregated: list[dict],
+    output: IO[str],
+    date_str: str,
+    project_map: dict,
+) -> None:
+    """Write the aggregated timesheet data as CSV."""
+    writer = csv.writer(output)
+    writer.writerow(["Date*", "Project*", "Task", "Description", "Quantity"])
+    for entry in aggregated:
+        project, task = resolve_project_task(entry["project"], project_map)
+        writer.writerow(
+            [
+                date_str,
+                project,
+                task,
+                entry["description"],
+                f"{entry['quantity']:.2f}",
+            ]
+        )
+
+
+def print_summary(aggregated: list[dict], project_map: dict) -> None:
+    """Print a human-readable summary of time blocks to stdout."""
+    grouped: dict[str, list[dict]] = OrderedDict()
+    for entry in aggregated:
+        project, task = resolve_project_task(entry["project"], project_map)
+        label = f"{project} / {task}" if task else project
+        grouped.setdefault(label, []).append(entry)
+
+    total_all = sum(e["quantity"] for e in aggregated)
+
+    all_descs = [e["description"] for e in aggregated]
+    desc_width = max(max((len(d) for d in all_descs), default=40), 40)
+    separator = "-" * (desc_width + 16)
+
+    for label, entries in grouped.items():
+        project_total = sum(e["quantity"] for e in entries)
+        print(f"\n  {label}  ({decimal_to_hhmm(project_total)})")
+        print("  " + separator)
+        for entry in entries:
+            print(f"    {entry['description']:<{desc_width}}  {decimal_to_hhmm(entry['quantity'])}")
+        print("  " + separator)
+
+    print(f"\n  {'TOTAL':<{desc_width + 2}}  {decimal_to_hhmm(total_all)}\n")
diff --git a/src/timesheets/parser.py b/src/timesheets/parser.py
new file mode 100644
index 0000000..eadc9f5
--- /dev/null
+++ b/src/timesheets/parser.py
@@ -0,0 +1,115 @@
+import re
+from collections import defaultdict
+
+from .utils import duration_from_start_end, parse_duration, strip_markdown_link
+
+
+def detect_has_duration_column(lines: list[str]) -> bool:
+    """
+    Inspect the header row to determine whether a Duration column is present.
+    Falls back to True if no header row is found.
+    """
+    for line in lines:
+        line = line.strip()
+        if not (line.startswith("|") and line.endswith("|")):
+            continue
+        cells = [c.strip().lower() for c in line.strip("|").split("|")]
+        if "start" in cells:
+            return "duration" in cells
+    return True
+
+
+def parse_table(lines: list[str], has_duration_col: bool = True) -> list[dict]:
+    """
+    Parse markdown table lines into a list of row dicts.
+
+    With duration:    Start | End | Duration | Project | Story | Note  (6 cols)
+    Without duration: Start | End | Project  | Story   | Note         (5 cols)
+    """
+    min_cols = 6 if has_duration_col else 5
+    rows = []
+
+    for line in lines:
+        line = line.strip()
+        if not line or re.match(r"^\|[-| :]+\|$", line):
+            continue
+        if not (line.startswith("|") and line.endswith("|")):
+            continue
+
+        cells = [c.strip() for c in line.strip("|").split("|")]
+        if len(cells) < min_cols:
+            continue
+
+        if has_duration_col:
+            start, end, duration, project, story, note = (
+                cells[0], cells[1], cells[2], cells[3],
+                strip_markdown_link(cells[4]),
+                strip_markdown_link(cells[5]),
+            )
+        else:
+            start, end, project, story, note = (
+                cells[0], cells[1], cells[2],
+                strip_markdown_link(cells[3]),
+                strip_markdown_link(cells[4]),
+            )
+            duration = None
+
+        if start.lower() == "start":
+            continue
+        if not re.match(r"^\d+:\d{2}$", start):
+            continue
+
+        if duration is not None:
+            if not re.match(r"^\d+:\d{2}$", duration):
+                continue
+            duration_hours = parse_duration(duration)
+        else:
+            try:
+                duration_hours = duration_from_start_end(start, end)
+            except ValueError:
+                continue
+
+        rows.append(
+            {
+                "start": start,
+                "end": end,
+                "duration_hours": duration_hours,
+                "project": project,
+                "story": story,
+                "note": note,
+            }
+        )
+
+    return rows
+
+
+def build_description(story: str, note: str) -> str:
+    """Combine story and note into a single description string."""
+    parts = [p.strip() for p in [story, note] if p.strip()]
+    return " - ".join(parts) if parts else "/"
+
+
+def aggregate_rows(rows: list[dict]) -> list[dict]:
+    """
+    Group rows by (project, description) and sum durations.
+    Returns a list of dicts with keys: project, description, quantity.
+    Preserves insertion order of first occurrence.
+    """
+    key_order: list[tuple] = []
+    totals: dict[tuple, float] = defaultdict(float)
+
+    for row in rows:
+        description = build_description(row["story"], row["note"])
+        key = (row["project"].strip(), description)
+        if key not in totals:
+            key_order.append(key)
+        totals[key] += row["duration_hours"]
+
+    return [
+        {
+            "project": project,
+            "description": description,
+            "quantity": totals[(project, description)],
+        }
+        for project, description in key_order
+    ]
diff --git a/src/timesheets/projects.py b/src/timesheets/projects.py
new file mode 100644
index 0000000..c1a7cd5
--- /dev/null
+++ b/src/timesheets/projects.py
@@ -0,0 +1,29 @@
+import json
+import sys
+
+
+def load_project_map(path: str | None) -> dict:
+    """Load a project map JSON file. Returns an empty dict if path is None or missing."""
+    if not path:
+        return {}
+    try:
+        with open(path, "r", encoding="utf-8") as f:
+            return json.load(f)
+    except FileNotFoundError:
+        print(f"Warning: project map file not found: {path}", file=sys.stderr)
+        return {}
+    except json.JSONDecodeError as e:
+        print(f"Warning: could not parse project map file: {e}", file=sys.stderr)
+        return {}
+
+
+def resolve_project_task(raw_project: str, project_map: dict) -> tuple[str, str]:
+    """
+    Look up a raw project key in the project map.
+    Returns (Project, Task) if found, or (raw_project, "") as fallback.
+    """
+    key = raw_project.strip().lower()
+    entry = project_map.get(key) or project_map.get(raw_project.strip())
+    if entry:
+        return entry.get("Project", raw_project), entry.get("Task", "")
+    return raw_project, ""
diff --git a/src/timesheets/utils.py b/src/timesheets/utils.py
new file mode 100644
index 0000000..7ef7d89
--- /dev/null
+++ b/src/timesheets/utils.py
@@ -0,0 +1,44 @@
+import re
+from datetime import date
+
+
+def parse_duration(duration_str: str) -> float:
+    """Convert HH:MM duration string to decimal hours."""
+    duration_str = duration_str.strip()
+    match = re.match(r"^(\d+):(\d{2})$", duration_str)
+    if not match:
+        raise ValueError(f"Invalid duration format: {duration_str!r}")
+    return int(match.group(1)) + int(match.group(2)) / 60.0
+
+
+def duration_from_start_end(start_str: str, end_str: str) -> float:
+    """Calculate duration in decimal hours from two HH:MM time strings."""
+
+    def to_minutes(t: str) -> int:
+        match = re.match(r"^(\d+):(\d{2})$", t.strip())
+        if not match:
+            raise ValueError(f"Invalid time format: {t!r}")
+        return int(match.group(1)) * 60 + int(match.group(2))
+
+    start_minutes = to_minutes(start_str)
+    end_minutes = to_minutes(end_str)
+    if end_minutes < start_minutes:
+        end_minutes += 24 * 60  # midnight rollover
+    return (end_minutes - start_minutes) / 60.0
+
+
+def decimal_to_hhmm(hours: float) -> str:
+    """Convert decimal hours to a HH:MM string."""
+    total_minutes = round(hours * 60)
+    h, m = divmod(total_minutes, 60)
+    return f"{h:02d}:{m:02d}"
+
+
+def strip_markdown_link(text: str) -> str:
+    """Strip markdown link syntax [label](url), keeping only the label."""
+    return re.sub(r"\[([^\]]+)\]\([^)]*\)", r"\1", text)
+
+
+def format_date(d: date) -> str:
+    """Format date as DD/MM/YY."""
+    return d.strftime("%d/%m/%y")
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_output.py b/tests/test_output.py
new file mode 100644
index 0000000..ec349a3
--- /dev/null
+++ b/tests/test_output.py
@@ -0,0 +1,113 @@
+import csv
+import io
+
+import pytest
+
+from timesheets.output import print_summary, write_csv
+
+# ---------------------------------------------------------------------------
+# Shared fixtures
+# ---------------------------------------------------------------------------
+
+PROJECT_MAP = {
+    "bugs": {"Project": "[Factry] Historian", "Task": "[Historian] Bugs"},
+}
+
+AGGREGATED = [
+    {"project": "bugs", "description": "ticket 1", "quantity": 1.0},
+    {"project": "bugs", "description": "ticket 2", "quantity": 0.5},
+    {"project": "scrum", "description": "dsu", "quantity": 0.25},
+]
+
+
+# ---------------------------------------------------------------------------
+# write_csv
+# ---------------------------------------------------------------------------
+
+
+class TestWriteCsv:
+    def _run(self, aggregated=None, date_str="22/03/26", project_map=None):
+        buf = io.StringIO()
+        write_csv(
+            aggregated or AGGREGATED,
+            buf,
+            date_str,
+            project_map or {},
+        )
+        buf.seek(0)
+        return list(csv.reader(buf))
+
+    def test_header_row(self):
+        rows = self._run()
+        assert rows[0] == ["Date*", "Project*", "Task", "Description", "Quantity"]
+
+    def test_row_count(self):
+        rows = self._run()
+        assert len(rows) == 1 + len(AGGREGATED)
+
+    def test_date_column(self):
+        rows = self._run(date_str="01/01/26")
+        assert all(r[0] == "01/01/26" for r in rows[1:])
+
+    def test_quantity_format(self):
+        rows = self._run()
+        assert rows[1][4] == "1.00"
+        assert rows[2][4] == "0.50"
+
+    def test_project_map_applied(self):
+        rows = self._run(project_map=PROJECT_MAP)
+        assert rows[1][1] == "[Factry] Historian"
+        assert rows[1][2] == "[Historian] Bugs"
+
+    def test_unmapped_project_fallback(self):
+        rows = self._run(project_map=PROJECT_MAP)
+        # "scrum" is not in the map
+        scrum_row = next(r for r in rows[1:] if "dsu" in r)
+        assert scrum_row[1] == "scrum"
+        assert scrum_row[2] == ""
+
+    def test_description_column(self):
+        rows = self._run()
+        assert rows[1][3] == "ticket 1"
+
+
+# ---------------------------------------------------------------------------
+# print_summary
+# ---------------------------------------------------------------------------
+
+
+class TestPrintSummary:
+    def _run(self, aggregated=None, project_map=None, capsys=None):
+        print_summary(aggregated or AGGREGATED, project_map or {})
+        return capsys.readouterr().out
+
+    def test_contains_project_label(self, capsys):
+        out = self._run(capsys=capsys)
+        assert "scrum" in out
+
+    def test_contains_mapped_project_label(self, capsys):
+        out = self._run(project_map=PROJECT_MAP, capsys=capsys)
+        assert "[Factry] Historian" in out
+        assert "[Historian] Bugs" in out
+
+    def test_contains_description(self, capsys):
+        out = self._run(capsys=capsys)
+        assert "ticket 1" in out
+        assert "dsu" in out
+
+    def test_contains_total(self, capsys):
+        out = self._run(capsys=capsys)
+        assert "TOTAL" in out
+        # 1.0 + 0.5 + 0.25 = 1.75 hours = 01:45
+        assert "01:45" in out
+
+    def test_project_subtotal(self, capsys):
+        out = self._run(capsys=capsys)
+        # bugs total = 1.0 + 0.5 = 1.5 hours = 01:30
+        assert "01:30" in out
+
+    def test_hhmm_durations_shown(self, capsys):
+        out = self._run(capsys=capsys)
+        assert "01:00" in out
+        assert "00:30" in out
+        assert "00:15" in out
diff --git a/tests/test_parser.py b/tests/test_parser.py
new file mode 100644
index 0000000..2691c6c
--- /dev/null
+++ b/tests/test_parser.py
@@ -0,0 +1,150 @@
+import pytest
+
+from timesheets.parser import (
+    aggregate_rows,
+    build_description,
+    detect_has_duration_column,
+    parse_table,
+)
+
+# ---------------------------------------------------------------------------
+# Fixtures / shared data
+# ---------------------------------------------------------------------------
+
+WITH_DURATION = [
+    "| Start | End   | Duration | Project | Story       | Note    |",
+    "|-------|-------|----------|---------|-------------|---------|",
+    "| 08:00 | 08:30 | 00:30    | bugs    | story one   |         |",
+    "| 08:30 | 09:00 | 00:30    | bugs    | story one   |         |",
+    "| 09:00 | 09:15 | 00:15    | scrum   |             | dsu     |",
+]
+
+WITHOUT_DURATION = [
+    "| Start | End   | Project | Story       | Note    |",
+    "|-------|-------|---------|-------------|---------|",
+    "| 08:00 | 08:30 | bugs    | story one   |         |",
+    "| 08:30 | 09:15 | scrum   |             | dsu     |",
+]
+
+
+# ---------------------------------------------------------------------------
+# detect_has_duration_column
+# ---------------------------------------------------------------------------
+
+
+class TestDetectHasDurationColumn:
+    def test_with_duration(self):
+        assert detect_has_duration_column(WITH_DURATION) is True
+
+    def test_without_duration(self):
+        assert detect_has_duration_column(WITHOUT_DURATION) is False
+
+    def test_no_header_defaults_to_true(self):
+        assert detect_has_duration_column(["no table here"]) is True
+
+    def test_case_insensitive(self):
+        lines = ["| Start | End | DURATION | Project | Story | Note |"]
+        assert detect_has_duration_column(lines) is True
+
+
+# ---------------------------------------------------------------------------
+# parse_table
+# ---------------------------------------------------------------------------
+
+
+class TestParseTable:
+    def test_with_duration_column(self):
+        rows = parse_table(WITH_DURATION, has_duration_col=True)
+        assert len(rows) == 3
+        assert rows[0]["project"] == "bugs"
+        assert rows[0]["duration_hours"] == 0.5
+        assert rows[2]["project"] == "scrum"
+        assert rows[2]["note"] == "dsu"
+
+    def test_without_duration_column(self):
+        rows = parse_table(WITHOUT_DURATION, has_duration_col=False)
+        assert len(rows) == 2
+        assert rows[0]["duration_hours"] == 0.5  # 08:00–08:30
+        assert rows[1]["duration_hours"] == 0.75  # 08:30–09:15
+
+    def test_header_row_skipped(self):
+        rows = parse_table(WITH_DURATION)
+        assert all(r["start"] != "Start" for r in rows)
+
+    def test_separator_row_skipped(self):
+        rows = parse_table(WITH_DURATION)
+        assert all(r["start"] != "---" for r in rows)
+
+    def test_markdown_link_stripped_in_story(self):
+        lines = [
+            "| Start | End   | Duration | Project | Story                      | Note |",
+            "|-------|-------|----------|---------|----------------------------|------|",
+            "| 08:00 | 08:30 | 00:30    | bugs    | [ticket 1](:/abc123)       |      |",
+        ]
+        rows = parse_table(lines)
+        assert rows[0]["story"] == "ticket 1"
+
+    def test_invalid_duration_row_skipped(self):
+        lines = [
+            "| Start | End   | Duration | Project | Story | Note |",
+            "|-------|-------|----------|---------|-------|------|",
+            "| 08:00 | 08:30 | bad      | bugs    |       |      |",
+        ]
+        assert parse_table(lines) == []
+
+    def test_empty_input(self):
+        assert parse_table([]) == []
+
+    def test_non_table_lines_ignored(self):
+        lines = ["# My Timesheet", "", "Some prose."] + WITH_DURATION
+        rows = parse_table(lines)
+        assert len(rows) == 3
+
+
+# ---------------------------------------------------------------------------
+# build_description
+# ---------------------------------------------------------------------------
+
+
+class TestBuildDescription:
+    def test_story_and_note(self):
+        assert build_description("story", "note") == "story - note"
+
+    def test_story_only(self):
+        assert build_description("story", "") == "story"
+
+    def test_note_only(self):
+        assert build_description("", "note") == "note"
+
+    def test_both_empty(self):
+        assert build_description("", "") == "/"
+
+    def test_strips_whitespace(self):
+        assert build_description("  story  ", "  note  ") == "story - note"
+
+
+# ---------------------------------------------------------------------------
+# aggregate_rows
+# ---------------------------------------------------------------------------
+
+
+class TestAggregateRows:
+    def test_same_project_story_summed(self):
+        rows = parse_table(WITH_DURATION)
+        aggregated = aggregate_rows(rows)
+        bugs = next(e for e in aggregated if e["project"] == "bugs")
+        assert bugs["quantity"] == 1.0  # 00:30 + 00:30
+
+    def test_distinct_entries_preserved(self):
+        rows = parse_table(WITH_DURATION)
+        aggregated = aggregate_rows(rows)
+        assert len(aggregated) == 2  # bugs/story-one and scrum/dsu
+
+    def test_insertion_order_preserved(self):
+        rows = parse_table(WITH_DURATION)
+        aggregated = aggregate_rows(rows)
+        assert aggregated[0]["project"] == "bugs"
+        assert aggregated[1]["project"] == "scrum"
+
+    def test_empty_input(self):
+        assert aggregate_rows([]) == []
diff --git a/tests/test_projects.py b/tests/test_projects.py
new file mode 100644
index 0000000..7f68ce6
--- /dev/null
+++ b/tests/test_projects.py
@@ -0,0 +1,67 @@
+import pytest
+
+from timesheets.projects import load_project_map, resolve_project_task
+
+PROJECT_MAP = {
+    "bugs": {"Project": "[Factry] Historian", "Task": "[Historian] Bugs"},
+    "internal": {"Project": "[Factry] Internal", "Task": ""},
+}
+
+
+# ---------------------------------------------------------------------------
+# load_project_map
+# ---------------------------------------------------------------------------
+
+
+class TestLoadProjectMap:
+    def test_returns_empty_for_none(self):
+        assert load_project_map(None) == {}
+
+    def test_loads_valid_file(self, tmp_path):
+        f = tmp_path / "map.json"
+        f.write_text('{"bugs": {"Project": "X", "Task": "Y"}}')
+        result = load_project_map(str(f))
+        assert result == {"bugs": {"Project": "X", "Task": "Y"}}
+
+    def test_missing_file_returns_empty(self, tmp_path, capsys):
+        result = load_project_map(str(tmp_path / "nonexistent.json"))
+        assert result == {}
+        assert "Warning" in capsys.readouterr().err
+
+    def test_invalid_json_returns_empty(self, tmp_path, capsys):
+        f = tmp_path / "bad.json"
+        f.write_text("not json{{{")
+        result = load_project_map(str(f))
+        assert result == {}
+        assert "Warning" in capsys.readouterr().err
+
+
+# ---------------------------------------------------------------------------
+# resolve_project_task
+# ---------------------------------------------------------------------------
+
+
+class TestResolveProjectTask:
+    def test_exact_key_match(self):
+        project, task = resolve_project_task("bugs", PROJECT_MAP)
+        assert project == "[Factry] Historian"
+        assert task == "[Historian] Bugs"
+
+    def test_case_insensitive_lookup(self):
+        project, task = resolve_project_task("BUGS", PROJECT_MAP)
+        assert project == "[Factry] Historian"
+
+    def test_missing_key_returns_raw(self):
+        project, task = resolve_project_task("unknown", PROJECT_MAP)
+        assert project == "unknown"
+        assert task == ""
+
+    def test_empty_task_in_map(self):
+        project, task = resolve_project_task("internal", PROJECT_MAP)
+        assert project == "[Factry] Internal"
+        assert task == ""
+
+    def test_empty_map(self):
+        project, task = resolve_project_task("bugs", {})
+        assert project == "bugs"
+        assert task == ""
diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 0000000..b043ddf
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,100 @@
+from datetime import date
+
+import pytest
+
+from timesheets.utils import (
+    decimal_to_hhmm,
+    duration_from_start_end,
+    format_date,
+    parse_duration,
+    strip_markdown_link,
+)
+
+
+class TestParseDuration:
+    def test_basic(self):
+        assert parse_duration("01:30") == 1.5
+
+    def test_zero(self):
+        assert parse_duration("00:00") == 0.0
+
+    def test_minutes_only(self):
+        assert parse_duration("00:15") == 0.25
+
+    def test_multidigit_hours(self):
+        assert parse_duration("10:00") == 10.0
+
+    def test_strips_whitespace(self):
+        assert parse_duration("  01:00  ") == 1.0
+
+    @pytest.mark.parametrize("bad", ["1:5", "abc", "1:00:00", ""])
+    def test_invalid_raises(self, bad):
+        with pytest.raises(ValueError):
+            parse_duration(bad)
+
+
+class TestDurationFromStartEnd:
+    def test_basic(self):
+        assert duration_from_start_end("08:00", "09:00") == 1.0
+
+    def test_partial_hour(self):
+        assert duration_from_start_end("08:15", "08:30") == 0.25
+
+    def test_midnight_rollover(self):
+        assert duration_from_start_end("23:45", "00:15") == 0.5
+
+    def test_same_time(self):
+        assert duration_from_start_end("09:00", "09:00") == 0.0
+
+    @pytest.mark.parametrize("bad_start,bad_end", [("9:0", "10:00"), ("08:00", "10:0")])
+    def test_invalid_raises(self, bad_start, bad_end):
+        with pytest.raises(ValueError):
+            duration_from_start_end(bad_start, bad_end)
+
+
+class TestDecimalToHhmm:
+    @pytest.mark.parametrize(
+        "hours,expected",
+        [
+            (1.0, "01:00"),
+            (1.5, "01:30"),
+            (0.25, "00:15"),
+            (0.0, "00:00"),
+            (10.0, "10:00"),
+            # rounding: 0.1666... hours = 10 minutes
+            (1 / 6, "00:10"),
+        ],
+    )
+    def test_conversion(self, hours, expected):
+        assert decimal_to_hhmm(hours) == expected
+
+
+class TestStripMarkdownLink:
+    def test_strips_link(self):
+        assert strip_markdown_link("[foo bar](http://example.com)") == "foo bar"
+
+    def test_strips_joplin_style_link(self):
+        text = "[29497: collector auto update](:/0ce89020cd874f0281a71f62b9d7b75f)"
+        assert strip_markdown_link(text) == "29497: collector auto update"
+
+    def test_plain_text_unchanged(self):
+        assert strip_markdown_link("just plain text") == "just plain text"
+
+    def test_empty_string(self):
+        assert strip_markdown_link("") == ""
+
+    def test_multiple_links(self):
+        text = "[a](url1) and [b](url2)"
+        assert strip_markdown_link(text) == "a and b"
+
+    def test_partial_link_unchanged(self):
+        # Missing closing paren — not a valid link, should be left alone
+        assert strip_markdown_link("[foo](bar") == "[foo](bar"
+
+
+class TestFormatDate:
+    def test_format(self):
+        assert format_date(date(2026, 3, 22)) == "22/03/26"
+
+    def test_single_digit_day_month(self):
+        assert format_date(date(2026, 1, 5)) == "05/01/26"
diff --git a/uv.lock b/uv.lock
new file mode 100644
index 0000000..d078cce
--- /dev/null
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@@ -0,0 +1,166 @@
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