test/langtools/tools/javac/platform/NumericalComparatorTest.java

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/**
 * @test
 * @bug 8196618
 * @summary Check that JDKPlatformProvider.NUMERICAL_COMPARATOR works correctly
 * @library /tools/lib
 * @modules jdk.compiler/com.sun.tools.javac.platform
 * @run main NumericalComparatorTest
 */

import java.io.IOException;
import java.util.List;
import java.util.stream.Collectors;

import com.sun.tools.javac.platform.JDKPlatformProvider;

public class NumericalComparatorTest {

    public static void main(String... args) throws IOException {
        new NumericalComparatorTest().run();
    }

    void run() throws IOException {
        doTest(List.of("8", "10", "11", "9", "b1", "a1", "a2"),
               List.of("8", "9", "10", "11", "a1", "a2", "b1"));
    }

    void doTest(List<String> input, List<String> expectedOutput) {
        List<String> actual = input.stream()
                                   .sorted(JDKPlatformProvider.NUMERICAL_COMPARATOR)
                                   .collect(Collectors.toList());
        if (!expectedOutput.equals(actual))
            throw new AssertionError("Unexpected output: " + actual);
    }

}