#!/usr/bin/env bash
# shellcheck disable=SC2034 # Used by test runner for reporting.
TEST_DESC="Deduplicate back-to-back list_changed notifications."
set -euo pipefail
# Source common assertion helpers and env
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=../common/env.sh
# shellcheck disable=SC1091
. "${SCRIPT_DIR}/../common/env.sh"
# shellcheck source=../common/assert.sh
# shellcheck disable=SC1091
. "${SCRIPT_DIR}/../common/assert.sh"
test_fast_sequence_notification_count() {
# The exact repro from the bug report
# Set up a workspace with at least one tool to ensure registries exist
local test_dir
test_dir="$(mktemp -d)"
mkdir -p "${test_dir}/tools/test-tool"
cat >"${test_dir}/tools/test-tool/tool.sh" <<'TOOL'
#!/usr/bin/env bash
# @describe A test tool
echo "ok"
TOOL
chmod +x "${test_dir}/tools/test-tool/tool.sh"
local output_file="${test_dir}/output.json"
# We use 2>/dev/null to ignore stderr logs
# Set short/disabled intervals to ensure background workers don't hold stdout open for long
# Redirect to file instead of pipe to separate process lifecycles
MCPBASH_RESOURCES_POLL_INTERVAL_SECS=0 \
MCPBASH_PROGRESS_FLUSH_INTERVAL=0.1 \
MCPBASH_PROJECT_ROOT="${test_dir}" \
"${MCPBASH_TEST_ROOT}/bin/mcp-bash" <<'EOF' >"${output_file}" 2>/dev/null
{"jsonrpc":"2.0","id":"init","method":"initialize","params":{}}
{"jsonrpc":"2.0","method":"notifications/initialized"}
{"jsonrpc":"2.0","id":"l1","method":"tools/list"}
{"jsonrpc":"2.0","id":"l2","method":"tools/list"}
EOF
local count
count=$(grep -c "list_changed" "${output_file}")
rm -rf "${test_dir}"
# With registries present, expect exactly 3 notifications (one triplet)
# NOT 0 (that would mean notifications are broken)
# NOT >3 (that would mean spurious notifications)
assert_eq 3 "${count}" "Fast sequence should produce exactly one triplet of notifications"
}
# Run the test
test_fast_sequence_notification_count
