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CDI Lang Model TCK Tests
There is a newer version: 4.1.0
package org.jboss.cdi.lang.model.tck;

import jakarta.enterprise.lang.model.declarations.ClassInfo;

class BridgeMethodsSuperClass {
    Number numberMethod() {
        return null;
    }
}

class BridgeMethodsClass extends BridgeMethodsSuperClass {
    // bridge method `Number numberMethod()` will be generated

    @Override
    Integer numberMethod() {
        return null;
    }
}

class BridgeMethodsGenericSuperClass {
    void genericMethod(T t) {
    }
}

class BridgeMethodsGenericClass extends BridgeMethodsGenericSuperClass {
    // bridge method `void genericMethod(Object)` will be generated

    @Override
    void genericMethod(String s) {
    }
}

public class BridgeMethods {
    BridgeMethodsClass covariantReturnTypes;
    BridgeMethodsGenericClass generics;

    public static void verify(ClassInfo clazz) {
        verifyCovariantReturnTypes(LangModelUtils.classOfField(clazz, "covariantReturnTypes"));
        verifyGenerics(LangModelUtils.classOfField(clazz, "generics"));
    }

    private static void verifyCovariantReturnTypes(ClassInfo clazz) {
        assert clazz.methods().size() == 2;

        assert clazz.methods()
                .stream()
                .filter(it -> "numberMethod".equals(it.name()))
                .filter(it -> it.returnType().asClass().declaration().name().equals("java.lang.Number"))
                .count() == 1;

        assert clazz.methods()
                .stream()
                .filter(it -> "numberMethod".equals(it.name()))
                .filter(it -> it.returnType().asClass().declaration().name().equals("java.lang.Integer"))
                .count() == 1;
    }

    private static void verifyGenerics(ClassInfo clazz) {
        assert clazz.methods().size() == 2;

        assert clazz.methods()
                .stream()
                .filter(it -> {
                    return "genericMethod".equals(it.name())
                            && it.parameters().size() == 1
                            && it.parameters().get(0).type().isTypeVariable()
                            && it.parameters().get(0).type().asTypeVariable().name().equals("T");
                })
                .count() == 1;

        assert clazz.methods()
                .stream()
                .filter(it -> {
                    return "genericMethod".equals(it.name())
                            && it.parameters().size() == 1
                            && it.parameters().get(0).type().isClass()
                            && it.parameters().get(0).type().asClass().declaration().name().equals("java.lang.String");
                })
                .count() == 1;
    }
}