[Bug]: test_unary_propose_fast_path_fallback_slow_path will randomly failed

[Phoenix500526]

Description about the bug

As the title described, the test case test_unary_propose_fast_path_fallback_slow_path will randomly failed.

Version

0.6.1 (Default)

Relevant log output

--- STDOUT:              curp client::tests::test_unary_propose_fast_path_fallback_slow_path ---

running 1 test
2024-06-07T07:51:50.826655Z  WARN test_unary_propose_fast_path_fallback_slow_path: curp::client::unary: propose cmd(0#16819838916010368377) to server(4) error: KeyConflict(())
2024-06-07T07:51:50.826753Z  WARN test_unary_propose_fast_path_fallback_slow_path: curp::client::unary: propose cmd(0#16819838916010368377) to server(3) error: KeyConflict(())
2024-06-07T07:51:50.927001Z DEBUG test_unary_propose_fast_path_fallback_slow_path: curp::client::unary: slow round for cmd(0#16819838916010368377) succeed
test client::tests::test_unary_propose_fast_path_fallback_slow_path ... FAILED

failures:

failures:
    client::tests::test_unary_propose_fast_path_fallback_slow_path

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 112 filtered out; finished in 0.11s

--- STDERR:              curp client::tests::test_unary_propose_fast_path_fallback_slow_path ---
thread 'client::tests::test_unary_propose_fast_path_fallback_slow_path' panicked at crates/curp/src/client/tests.rs:583:5:
assertion `left == right` failed
  left: 3
 right: 5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

   Canceling due to test failure: 3 tests still running
        PASS [   0.023s] curp client::tests::test_unary_slow_round_fetch_leader_first
        PASS [   0.123s] curp client::tests::test_unary_propose_slow_path_works
        PASS [   1.910s] benchmark bench_client::test::test_new_etcd_client
        PASS [   2.092s] benchmark bench_client::test::test_new_xline_client
------------
     Summary [   2.101s] 25/345 tests run: 24 passed, 1 failed, 0 skipped
        FAIL [   0.125s] curp client::tests::test_unary_propose_fast_path_fallback_slow_path
error: test run failed
error: process didn't exit successfully: `/github/home/.rustup/toolchains/1.74.0-x86_64-unknown-linux-gnu/bin/cargo nextest run --manifest-path /__w/Xline/Xline/Cargo.toml --target-dir /__w/Xline/Xline/target/llvm-cov-target --all-features --workspace` (exit status: 100)
Error: Process completed with exit code 1.

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[CrystalAnalyst]

This reason is located and solved in PR : #859