Add more rayon tests with global pool

Author: 197g

Cargo.toml

@@ -19,6 +19,13 @@ png = "0.16"
 walkdir = "2.0"
 criterion = "0.3"
 
+[features]
+default = ["rayon"]
+platform_independent = []
+nightly_aarch64_neon = []
+
+## Internal development configuration: testing and benchmarking
+
 [[bench]]
 name = "decoding_benchmark"
 harness = false
@@ -31,8 +38,10 @@ harness = false
 name = "rayon"
 required-features = ["rayon"]
 
-[features]
-default = ["rayon"]
-platform_independent = []
-nightly_aarch64_neon = []
+[[test]]
+name = "rayon-0"
+required-features = ["rayon"]
 
+[[test]]
+name = "rayon-1"
+required-features = ["rayon"]

tests/rayon-0.rs

@@ -0,0 +1,16 @@
+//! Must be a separate test because it modifies the _global_ rayon pool.
+use std::{fs::File, path::Path};
+use jpeg_decoder::Decoder;
+
+#[test]
+fn decoding_in_global_pool() {
+    let path = Path::new("tests").join("reftest").join("images").join("mozilla").join("jpg-progressive.jpg");
+
+    rayon::ThreadPoolBuilder::new()
+        .num_threads(1)
+        .build_global()
+        .unwrap();
+
+    let mut decoder = Decoder::new(File::open(&path).unwrap());
+    let _ = decoder.decode().unwrap();
+}

tests/rayon-1.rs

@@ -0,0 +1,18 @@
+//! Must be a separate test because it modifies the _global_ rayon pool.
+use std::{fs::File, path::Path};
+use jpeg_decoder::Decoder;
+
+#[test]
+fn decoding_in_fetched_global_pool() {
+    let path = Path::new("tests").join("reftest").join("images").join("mozilla").join("jpg-progressive.jpg");
+
+    rayon::ThreadPoolBuilder::new()
+        .num_threads(1)
+        .build_global()
+        .unwrap();
+
+    rayon::scope(|_| {
+        let mut decoder = Decoder::new(File::open(&path).unwrap());
+        let _ = decoder.decode().unwrap();
+    })
+}