test(neon): Add new feature flags to the build matrix and unignore th…

…e test

crates/neon/Cargo.toml

@@ -11,6 +11,7 @@ exclude = ["neon.jpg", "doc/**/*"]
 edition = "2021"
 
 [dev-dependencies]
+itertools = "0.10.5"
 semver = "1.0.20"
 psd = "0.3.4"        # used for a doc example
 anyhow = "1.0.75"    # used for a doc example

crates/neon/src/lib.rs

@@ -149,18 +149,21 @@ pub struct Exports(());
 impl Exports {
     /// Export all values exported with [`neon::export`](export)
     ///
-    /// ```ignore
+    /// ```
+    /// # fn main() {
     /// # use neon::prelude::*;
     /// #[neon::main]
     /// fn main(mut cx: ModuleContext) -> NeonResult<()> {
     ///     neon::registered().export(&mut cx)?;
     ///     Ok(())
     /// }
+    /// # }
     /// ```
     ///
     /// For more control, iterate over exports.
     ///
-    /// ```ignore
+    /// ```
+    /// # fn main() {
     /// # use neon::prelude::*;
     /// #[neon::main]
     /// fn main(mut cx: ModuleContext) -> NeonResult<()> {
@@ -172,6 +175,7 @@ impl Exports {
     ///
     ///     Ok(())
     /// }
+    /// # }
     /// ```
     pub fn export(self, cx: &mut ModuleContext) -> NeonResult<()> {
         for create in self {
@@ -202,33 +206,18 @@ pub fn registered() -> Exports {
 }
 
 #[test]
-#[ignore]
 fn feature_matrix() {
     use std::{env, process::Command};
 
-    const EXTERNAL_BUFFERS: &str = "external-buffers";
-    const FUTURES: &str = "futures";
-    const SERDE: &str = "serde";
     const NODE_API_VERSIONS: &[&str] = &[
         "napi-1", "napi-2", "napi-3", "napi-4", "napi-5", "napi-6", "napi-7", "napi-8",
     ];
 
-    // If the number of features in Neon grows, we can use `itertools` to generate permutations.
-    // https://docs.rs/itertools/latest/itertools/trait.Itertools.html#method.permutations
-    const FEATURES: &[&[&str]] = &[
-        &[],
-        &[EXTERNAL_BUFFERS],
-        &[FUTURES],
-        &[SERDE],
-        &[EXTERNAL_BUFFERS, FUTURES],
-        &[EXTERNAL_BUFFERS, SERDE],
-        &[FUTURES, SERDE],
-        &[EXTERNAL_BUFFERS, FUTURES, SERDE],
-    ];
+    const FEATURES: &[&str] = &["external-buffers", "futures", "serde", "tokio", "tokio-rt"];
 
     let cargo = env::var_os("CARGO").unwrap_or_else(|| "cargo".into());
 
-    for features in FEATURES {
+    for features in itertools::Itertools::powerset(FEATURES.iter()) {
         for version in NODE_API_VERSIONS.iter().map(|f| f.to_string()) {
             let features = features.iter().fold(version, |f, s| f + "," + s);
             let status = Command::new(&cargo)