Feature to disable the async work

serial_test/Cargo.toml

@@ -19,19 +19,22 @@ document-features = { version = "0.2", optional = true }
 log = { version = "0.4", optional = true }
 futures = { version = "^0.3", default_features = false, features = [
     "executor",
-] }
+], optional = true}
 dashmap = { version = "5"}
 
 [dev-dependencies]
 itertools = "0.10"
 tokio = { version = "^1.17", features = ["macros", "rt"] }
 
 [features]
-default = ["logging"]
+default = ["logging", "async"]
 
 ## Switches on debug logging (and requires the `log` package)
 logging = ["log"]
 
+## Enables async features
+async = ["futures"]
+
 ## The file_locks feature unlocks the `file_serial`/`file_parallel` macros
 file_locks = ["fslock"]
 

serial_test/src/lib.rs

@@ -64,26 +64,27 @@ mod parallel_file_lock;
 #[cfg(feature = "file_locks")]
 mod serial_file_lock;
 
-pub use parallel_code_lock::{
-    local_async_parallel_core, local_async_parallel_core_with_return, local_parallel_core,
-    local_parallel_core_with_return,
-};
-pub use serial_code_lock::{
-    local_async_serial_core, local_async_serial_core_with_return, local_serial_core,
-    local_serial_core_with_return,
-};
+#[cfg(feature = "async")]
+pub use parallel_code_lock::{local_async_parallel_core, local_async_parallel_core_with_return};
+
+pub use parallel_code_lock::{local_parallel_core, local_parallel_core_with_return};
+
+#[cfg(feature = "async")]
+pub use serial_code_lock::{local_async_serial_core, local_async_serial_core_with_return};
+
+pub use serial_code_lock::{local_serial_core, local_serial_core_with_return};
+
+#[cfg(all(feature = "file_locks", feature = "async"))]
+pub use serial_file_lock::{fs_async_serial_core, fs_async_serial_core_with_return};
 
 #[cfg(feature = "file_locks")]
-pub use serial_file_lock::{
-    fs_async_serial_core, fs_async_serial_core_with_return, fs_serial_core,
-    fs_serial_core_with_return,
-};
+pub use serial_file_lock::{fs_serial_core, fs_serial_core_with_return};
+
+#[cfg(all(feature = "file_locks", feature = "async"))]
+pub use parallel_file_lock::{fs_async_parallel_core, fs_async_parallel_core_with_return};
 
 #[cfg(feature = "file_locks")]
-pub use parallel_file_lock::{
-    fs_async_parallel_core, fs_async_parallel_core_with_return, fs_parallel_core,
-    fs_parallel_core_with_return,
-};
+pub use parallel_file_lock::{fs_parallel_core, fs_parallel_core_with_return};
 
 // Re-export #[serial/parallel].
 pub use serial_test_derive::{parallel, serial};

serial_test/src/parallel_code_lock.rs

@@ -1,6 +1,7 @@
 #![allow(clippy::await_holding_lock)]
 
 use crate::code_lock::{check_new_key, LOCKS};
+#[cfg(feature = "async")]
 use futures::FutureExt;
 use std::{panic, time::Duration};
 
@@ -40,6 +41,7 @@ pub fn local_parallel_core(name: &str, max_wait: Option<Duration>, function: fn(
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn local_async_parallel_core_with_return<E>(
     name: &str,
     max_wait: Option<Duration>,
@@ -60,6 +62,7 @@ pub async fn local_async_parallel_core_with_return<E>(
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn local_async_parallel_core(
     name: &str,
     max_wait: Option<Duration>,
@@ -78,10 +81,10 @@ pub async fn local_async_parallel_core(
 
 #[cfg(test)]
 mod tests {
-    use crate::{
-        code_lock::LOCKS, local_async_parallel_core, local_async_parallel_core_with_return,
-        local_parallel_core, local_parallel_core_with_return,
-    };
+    #[cfg(feature = "async")]
+    use crate::{local_async_parallel_core, local_async_parallel_core_with_return};
+
+    use crate::{code_lock::LOCKS, local_parallel_core, local_parallel_core_with_return};
     use std::{io::Error, panic};
 
     #[test]
@@ -122,6 +125,7 @@ mod tests {
     }
 
     #[tokio::test]
+    #[cfg(feature = "async")]
     async fn unlock_on_assert_async_without_return() {
         async fn demo_assert() {
             assert!(false);
@@ -146,6 +150,7 @@ mod tests {
     }
 
     #[tokio::test]
+    #[cfg(feature = "async")]
     async fn unlock_on_assert_async_with_return() {
         async fn demo_assert() -> Result<(), Error> {
             assert!(false);

serial_test/src/parallel_file_lock.rs

@@ -1,5 +1,6 @@
 use std::{panic, time::Duration};
 
+#[cfg(feature = "async")]
 use futures::FutureExt;
 
 use crate::file_lock::make_lock_for_name_and_path;
@@ -40,6 +41,7 @@ pub fn fs_parallel_core_with_return<E>(
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn fs_async_parallel_core_with_return<E>(
     name: &str,
     _max_wait: Option<Duration>,
@@ -58,6 +60,7 @@ pub async fn fs_async_parallel_core_with_return<E>(
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn fs_async_parallel_core(
     name: &str,
     _max_wait: Option<Duration>,
@@ -74,10 +77,12 @@ pub async fn fs_async_parallel_core(
 
 #[cfg(test)]
 mod tests {
+    #[cfg(feature = "async")]
+    use crate::{fs_async_parallel_core, fs_async_parallel_core_with_return};
+
     use crate::{
         file_lock::{path_for_name, Lock},
-        fs_async_parallel_core, fs_async_parallel_core_with_return, fs_parallel_core,
-        fs_parallel_core_with_return,
+        fs_parallel_core, fs_parallel_core_with_return,
     };
     use std::{io::Error, panic};
 
@@ -120,6 +125,7 @@ mod tests {
     }
 
     #[tokio::test]
+    #[cfg(feature = "async")]
     async fn unlock_on_assert_async_without_return() {
         let lock_path = path_for_name("unlock_on_assert_async_without_return");
         async fn demo_assert() {
@@ -145,6 +151,7 @@ mod tests {
     }
 
     #[tokio::test]
+    #[cfg(feature = "async")]
     async fn unlock_on_assert_async_with_return() {
         let lock_path = path_for_name("unlock_on_assert_async_with_return");
 

serial_test/src/serial_code_lock.rs

@@ -28,6 +28,7 @@ pub fn local_serial_core(name: &str, max_wait: Option<Duration>, function: fn())
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn local_async_serial_core_with_return<E>(
     name: &str,
     max_wait: Option<Duration>,
@@ -42,6 +43,7 @@ pub async fn local_async_serial_core_with_return<E>(
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn local_async_serial_core(
     name: &str,
     max_wait: Option<Duration>,

serial_test/src/serial_file_lock.rs

@@ -25,6 +25,7 @@ pub fn fs_serial_core_with_return<E>(
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn fs_async_serial_core_with_return<E>(
     name: &str,
     _max_wait: Option<Duration>,
@@ -39,6 +40,7 @@ pub async fn fs_async_serial_core_with_return<E>(
 }
 
 #[doc(hidden)]
+#[cfg(feature = "async")]
 pub async fn fs_async_serial_core(
     name: &str,
     _max_wait: Option<Duration>,

serial_test_derive/src/lib.rs

@@ -380,6 +380,9 @@ where
 {
     let ast: syn::ItemFn = syn::parse2(input).unwrap();
     let asyncness = ast.sig.asyncness;
+    if asyncness.is_some() && cfg!(not(feature = "async")) {
+        panic!("async testing attempted with async feature disabled in serial_test!");
+    }
     let name = ast.sig.ident;
     let return_type = match ast.sig.output {
         syn::ReturnType::Default => None,
@@ -577,6 +580,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg(feature = "async")]
     fn test_serial_async() {
         let attrs = proc_macro2::TokenStream::new();
         let input = quote! {
@@ -592,6 +596,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg(feature = "async")]
     fn test_serial_async_return() {
         let attrs = proc_macro2::TokenStream::new();
         let input = quote! {
@@ -609,6 +614,7 @@ mod tests {
     // 1.54 needed for https://github.com/rust-lang/rust/commit/9daf546b77dbeab7754a80d7336cd8d00c6746e4 change in note message
     #[rustversion::since(1.54)]
     #[test]
+    #[cfg(feature = "async")]
     fn test_serial_async_before_wrapper() {
         let t = trybuild::TestCases::new();
         t.compile_fail("tests/broken/test_serial_async_before_wrapper.rs");