feat: JSON, Excel export and time summary

- #23: add JSONFormatter and XLSXFormatter
- add openpyxl dependency for .xlsx export
- #22: add --summary flag and calculate_summary() in report_builder
- ReportRow now carries raw hours for summary calculations
- update CLI help and README with .json/.xlsx formats and --summary
- add tests for new formatters and summary computation

Closes #22, closes #23

tests/test_formatters.py

@@ -1,4 +1,5 @@
 import io
+import json
 from typing import List
 from unittest import mock
 
@@ -7,9 +8,12 @@ from odf.opendocument import OpenDocument, OpenDocumentText
 
 from redmine_reporter.formatters.console import CompactFormatter, TableFormatter
 from redmine_reporter.formatters.csv import CSVFormatter
+from redmine_reporter.formatters.factory import get_formatter_by_extension
 from redmine_reporter.formatters.html import HTMLFormatter
+from redmine_reporter.formatters.json import JSONFormatter
 from redmine_reporter.formatters.markdown import MarkdownFormatter
 from redmine_reporter.formatters.odt import ODTFormatter
+from redmine_reporter.formatters.xlsx import XLSXFormatter
 from redmine_reporter.types import ReportRow
 
 
@@ -223,6 +227,7 @@ TEXT_FORMATTER_FACTORIES = [
     ("table", lambda: TableFormatter()),
     ("compact", lambda: CompactFormatter()),
     ("csv", lambda: CSVFormatter()),
+    ("json", lambda: JSONFormatter()),
     ("markdown", lambda: MarkdownFormatter()),
 ]
 
@@ -250,6 +255,10 @@ def test_text_formatter_contains_key_content(fake_rows, name, factory):
         # В CSV issue_id и subject -- отдельные колонки
         assert "101" in output
         assert "Реализовать фичу X" in output
+    elif name == "json":
+        # В JSON issue_id -- число, subject -- отдельное поле
+        assert '"issue_id": 101' in output
+        assert "Реализовать фичу X" in output
     else:
         assert "101. Реализовать фичу X" in output
 
@@ -298,6 +307,44 @@ def test_csv_uses_full_values_not_display(fake_rows):
     assert "v1.0" in lines[2]
 
 
+def test_json_save_writes_parsable_data(fake_rows, tmp_path):
+    """JSON-файл содержит валидный JSON со всеми строками отчёта."""
+    output = tmp_path / "report.json"
+    JSONFormatter().save(fake_rows, str(output))
+    data = json.loads(output.read_text(encoding="utf-8"))
+    assert len(data) == len(fake_rows)
+    assert data[0]["project"] == "Проект A"
+    assert data[0]["issue_id"] == 101
+
+
+def test_get_formatter_by_extension_json():
+    """get_formatter_by_extension('.json') возвращает JSONFormatter."""
+    formatter = get_formatter_by_extension(".json")
+    assert isinstance(formatter, JSONFormatter)
+
+
+def test_get_formatter_by_extension_xlsx():
+    """get_formatter_by_extension('.xlsx') возвращает XLSXFormatter."""
+    formatter = get_formatter_by_extension(".xlsx")
+    assert isinstance(formatter, XLSXFormatter)
+
+
+def test_xlsx_save_creates_valid_file(fake_rows, tmp_path):
+    """XLSX-файл сохраняется и содержит корректные данные."""
+    from openpyxl import load_workbook
+
+    output = tmp_path / "report.xlsx"
+    XLSXFormatter().save(fake_rows, str(output))
+
+    wb = load_workbook(str(output))
+    ws = wb.active
+    assert ws.title == "Report"
+    assert ws["A1"].value == "Project"
+    assert ws["A2"].value == "Проект A"
+    assert ws["C2"].value == 101
+    assert ws.max_row == len(fake_rows) + 1  # header + data
+
+
 def test_markdown_formatter_escapes_table_cells():
     rows = make_fake_report_rows()
     rows[0]["project"] = "A|B"