Don't pass through test filter to `cargo build`.

src/command/test.rs

@@ -243,7 +243,15 @@ impl Test {
     fn step_build_tests(&mut self) -> Result<(), Error> {
         info!("Compiling tests to wasm...");
 
-        build::cargo_build_wasm_tests(&self.crate_path, !self.release, &self.extra_options)?;
+        // If the user has run `wasm-pack test -- --features "f1" -- test_name`, then we want to only pass through
+        // `--features "f1"` to `cargo build`
+        let extra_options =
+            if let Some(index) = self.extra_options.iter().position(|arg| arg == "--") {
+                &self.extra_options[..index]
+            } else {
+                &self.extra_options
+            };
+        build::cargo_build_wasm_tests(&self.crate_path, !self.release, extra_options)?;
 
         info!("Finished compiling tests to wasm.");
         Ok(())

tests/all/test.rs

@@ -380,13 +380,25 @@ fn extra_options_is_passed_to_cargo_when_building_tests() {
                 fn smoke() {
                     foo::foo();
                 }
+
+                #[wasm_bindgen_test]
+                fn fire() {
+                    panic!("This should be filtered from test execution.");
+                }
             "#,
         )
         .install_local_wasm_bindgen();
     let _lock = fixture.lock();
     fixture
         .wasm_pack()
-        .args(&["test", "--node", "--", "--no-default-features"])
+        .args(&[
+            "test",
+            "--node",
+            "--",
+            "--no-default-features",
+            "--",
+            "smoke",
+        ])
         .assert()
         .success();
 }