crates/jni/tests/invocation_character_encoding.rs

// This is a separate test program because it has to start a JVM with a specific option.

#![cfg(feature = "invocation")]

use jni::{objects::JString, InitArgsBuilder, JavaVM};

#[test]
fn invocation_character_encoding() {
    let jvm_args = InitArgsBuilder::new()
        .version(jni::JNIVersion::V8)
        .option("-Xcheck:jni")
        // U+00A0 NO-BREAK SPACE is the only non-ASCII character that's present in all parts of
        // ISO 8859. This minimizes the chance of this test failing as a result of the character
        // not being present in the platform default character encoding. This test will still fail
        // on platforms where the default character encoding cannot represent a no-break space,
        // such as GBK.
        .option("-Dnbsp=\u{00a0}")
        .build()
        .unwrap_or_else(|e| panic!("{:#?}", e));

    let jvm = JavaVM::new(jvm_args).unwrap_or_else(|e| panic!("{:#?}", e));

    let mut env = jvm.attach_current_thread().unwrap();

    let prop_name = env.new_string("nbsp").unwrap();

    let prop_value: JString = env
        .call_static_method(
            "java/lang/System",
            "getProperty",
            "(Ljava/lang/String;)Ljava/lang/String;",
            &[(&prop_name).into()],
        )
        .unwrap()
        .l()
        .unwrap()
        .into();

    let prop_value_str = env.get_string(&prop_value).unwrap();
    let prop_value_str: &str = prop_value_str.to_str().unwrap();

    assert_eq!("\u{00a0}", prop_value_str);
}