LanguageCacheReflectiveReinitializationTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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package com.oracle.truffle.api.test.vm;

import java.lang.reflect.Method;
import java.util.Map;
import java.util.Set;

import org.junit.Assert;
import org.junit.Test;

import com.oracle.truffle.api.test.ReflectionUtils;

public class LanguageCacheReflectiveReinitializationTest {

    @Test
    @SuppressWarnings("unchecked")
    public void canReinitializeLanguages() throws Exception {
        Class<?> languageCacheClass = Class.forName("com.oracle.truffle.api.vm.LanguageCache");
        Method initMethod = languageCacheClass.getDeclaredMethod("initializeLanguages", ClassLoader.class);
        ReflectionUtils.setAccessible(initMethod, true);
        Map<String, Object> languages = (Map<String, Object>) initMethod.invoke(null, Thread.currentThread().getContextClassLoader());
        Method getMimeTypes = languageCacheClass.getDeclaredMethod("getMimeTypes");
        ReflectionUtils.setAccessible(getMimeTypes, true);
        for (Object lang : languages.values()) {
            Set<String> mimeTypes = (Set<String>) getMimeTypes.invoke(lang);
            if (mimeTypes.contains("application/x-test-hash")) {
                return;
            }
        }

        Assert.fail("Re-initialized languages must contain application/x-test language after reflective initialization");
    }
}