testing module with mock redis connection and command

Cargo.toml

@@ -1,3 +1,2 @@
 [workspace]
-members = ["redis"]
-
+members = ["redis", "redis-test"]

redis-test/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "redis-test"
+version = "0.1.0"
+edition = "2021"
+description = "Testing helpers for the `redis` crate"
+homepage = "https://github.com/redis-rs/redis-rs"
+repository = "https://github.com/redis-rs/redis-rs"
+documentation = "https://docs.rs/redis-test"
+license = "BSD-3-Clause"
+
+[dependencies]
+redis = { version = "0.21.5", path = "../redis" }
+
+bytes = { version = "1", optional = true }
+futures = { version = "0.3", optional = true }
+
+[features]
+aio = ["futures", "redis/aio"]
+tokio-comp = ["redis/tokio-comp"]
+async-std-comp = ["redis/async-std-comp"]
+
+[dev-dependencies]
+tokio = { version = "1", features = ["rt", "macros", "rt-multi-thread", "time"] }
+

redis-test/src/lib.rs

@@ -0,0 +1,26 @@
+//! Testing support
+//!
+//! This module provides `MockRedisConnection` which implements ConnectionLike and can be
+//! used in the same place as any other type that behaves like a Redis connection. This is useful
+//! for writing unit tests without needing a Redis server.
+//!
+//! # Example
+//!
+//! ```rust
+//! use redis::{ConnectionLike, RedisError};
+//! use redis_test::mock_conn::{MockCmd, MockRedisConnection};
+//!
+//! fn my_exists<C: ConnectionLike>(conn: &mut C, key: &str) -> Result<bool, RedisError> {
+//!     let exists: bool = redis::cmd("EXISTS").arg(key).query(conn)?;
+//!     Ok(exists)
+//! }
+//!
+//! let mut mock_connection = MockRedisConnection::new(vec![
+//!     MockCmd::new(redis::cmd("EXISTS").arg("foo"), Ok("1")),
+//! ]);
+//!
+//! let result = my_exists(&mut mock_connection, "foo").unwrap();
+//! assert_eq!(result, true);
+//! ```
+
+pub mod mock_conn;