test(cli): comprehensive test suite for manus-agent history subcommand (+39 tests)

[manus-use]

Summary

Adds a comprehensive test suite for the manus-agent history subcommand, which previously had zero test coverage despite having meaningful logic (text/JSON output, filtering, clearing, ordering, malformed data handling).

What's tested (39 tests)

Text output (6 tests)

• Entry count display, timestamps, agent type column
• Long task truncation with ellipsis
• Success/failure indicators (✓/✗)
• History file path footer

JSON output (3 tests)

• Valid JSON array output
• Most-recent-first ordering
• All fields preserved correctly

--limit (4 tests)

• Default limit of 20
• Custom limit values
• --limit 0 shows all entries
• Limit larger than available records

--grep (5 tests)

• Substring filtering by task content
• Case-insensitive matching
• No-match empty state message
• Combined with --limit
• Partial match behavior

--clear (2 tests)

• File deletion and confirmation message
• Graceful handling of non-existent file

Empty/missing states (3 tests)

• Non-existent history file
• Empty history file
• Whitespace-only file

Malformed JSONL handling (3 tests)

• Skipping invalid JSON lines
• Mixed valid/invalid records
• Records with missing optional fields

_append_history helper (6 tests)

• Parent directory creation
• All fields written correctly
• UTC ISO-8601 timestamps
• Multiple appends (JSONL format)
• Failure records
• Unicode content

Ordering (2 tests)

• Most-recent-first in text output
• Most-recent-first in JSON output

Edge cases (5 tests)

• Single record
• Special regex characters in grep (substring, not regex)
• Empty task field
• Large history file (500 records)
• Explicit --format text

Files changed

File	Change
tests/test_cli_history.py	New — 39 fully-mocked tests

Test results

1197 passed (baseline 1158 + 39 new), 0 failures. Ruff clean.

Duplicate check

Checked all open PRs (#64–#131) and merged PRs (#39–#102) — none cover history subcommand tests. PR #123 covers _run_analyze/_run_remediate/_run_discover tests (different subcommands). PR #121 covers blast-radius tests. PR #120 covers osv tests. This is the first test suite for history.