JUnit 6.1.3, compiling OldApis.java
src/compat/OldApis.java:1: error: package org.junit.jupiter.api does not exist
import org.junit.jupiter.api.MethodOrderer;
                            ^
src/compat/OldApis.java:2: error: package org.junit.jupiter.api does not exist
import org.junit.jupiter.api.Test;
                            ^
src/compat/OldApis.java:3: error: package org.junit.jupiter.api does not exist
import org.junit.jupiter.api.TestMethodOrder;
                            ^
src/compat/OldApis.java:4: error: package org.junit.jupiter.api.io does not exist
import org.junit.jupiter.api.io.TempDir;
                               ^
src/compat/OldApis.java:5: error: package org.junit.platform.commons.support does not exist
import org.junit.platform.commons.support.ReflectionSupport;
                                         ^
src/compat/OldApis.java:8: error: cannot find symbol
@TestMethodOrder(MethodOrderer.Alphanumeric.class)
 ^
  symbol: class TestMethodOrder
src/compat/OldApis.java:8: error: package MethodOrderer does not exist
@TestMethodOrder(MethodOrderer.Alphanumeric.class)
                              ^
src/compat/OldApis.java:11: error: cannot find symbol
    @Test
     ^
  symbol:   class Test
  location: class OldApis
src/compat/OldApis.java:13: error: cannot find symbol
        Object loaded = ReflectionSupport.loadClass("java.lang.String");
                        ^
  symbol:   variable ReflectionSupport
  location: class OldApis
src/compat/OldApis.java:14: error: cannot find symbol
        String property = TempDir.SCOPE_PROPERTY_NAME;
                          ^
  symbol:   variable TempDir
  location: class OldApis
10 errors
javac exit status: 1