Make wasm-bindgen-test a dev dependency

Cargo.toml

@@ -140,7 +140,6 @@ winreg = "0.7"
 js-sys = "0.3.45"
 wasm-bindgen = { version = "0.2.68", features = ["serde-serialize"] }
 wasm-bindgen-futures = "0.4.18"
-wasm-bindgen-test = "0.3"
 
 [target.'cfg(target_arch = "wasm32")'.dependencies.web-sys]
 version = "0.3.25"
@@ -157,6 +156,9 @@ features = [
     "ServiceWorkerGlobalScope",
 ]
 
+[target.'cfg(target_arch = "wasm32")'.dev-dependencies]
+wasm-bindgen-test = "0.3"
+
 [[example]]
 name = "blocking"
 path = "examples/blocking.rs"

src/wasm/client.rs

@@ -299,6 +299,8 @@ impl Config {
     }
 }
 
+#[cfg(test)]
+mod tests {
     use wasm_bindgen_test::*;
 
     wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
@@ -367,3 +369,4 @@ async fn default_headers_clone() {
             "request headers don't change client defaults"
         );
     }
+}