RFR: 8378163: test/jdk/java/net/httpclient/*.java: convert tests that use ITestContext to JUnit

[Volkan Yazici]

On Wed, 18 Feb 2026 14:36:22 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

> When using [TestInstance.Lifecycle.PER_CLASS](https://docs.junit.org/5.0.0/api/org/junit/jupiter/api/TestInstance.html) then a single instance of the class will be used to invoke all test methods. It makes it possible to use `@BeforeAll` `@AfterAll` to setup and teardown objects/variables that all tests methods depend on.

@dfuch, AFAICT, as long as your shared state is in `static` variables, `@BeforeAll`/`@AfterAll` will be executed _once_ even if test methods use different instances. Consider the following example:

    /* @test
     * @run junit ${test.main.class} */
    
    import org.junit.jupiter.api.BeforeAll;
    import org.junit.jupiter.api.Test;
    
    class FooTest {
        private static int X;
        @BeforeAll static void beforeAll() { System.err.println("beforeAll"); X = 1; }
        FooTest() { System.err.println("ctor"); }
        @Test void test1() { System.err.println("test1's X:" + X); }
        @Test void test2() { System.err.println("test2's X:" + X); }
    }

`make run-test TEST=/path/to/FooTest.java` will produce the following JTReg output:

    beforeAll
    ctor
    [09:24:27.225] STARTED    FooTest::test1 'test1()'
    test1's X:1
    [09:24:27.233] SUCCESSFUL FooTest::test1 'test1()' [8ms]
    ctor
    [09:24:27.234] STARTED    FooTest::test2 'test2()'
    test2's X:1
    [09:24:27.235] SUCCESSFUL FooTest::test2 'test2()' [0ms]

Above test output indicates that

1. `beforeAll()` is executed once
2. Both `test1` and `test2` observe the same `X`

In conclusion, I think we can do without any `@TestInstance`. If you think otherwise, would you mind helping me to understand, please?

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PR Review Comment: https://git.openjdk.org/jdk/pull/29786#discussion_r2826334283