@ParameterizedTest
    @EnumSource(Mode.class)
    void shouldNormalizeAmpersand(Mode mode) {
        assertAccepted(parse(mode, "/&?a=1&a=2&b=3"), "/&", "a=1&a=2&b=3");
        assertAccepted(parse(mode, "/%26?a=1%26a=2&b=3"), "/&", "a=1%26a=2&b=3");
    }
{@link RequestTarget} treats the first `=` in a query parameter as `/` internally to simplify
the detection the logic. This test makes sure the `=` appeared later is not treated as `/`.
core/src/test/java/com/linecorp/armeria/internal/common/DefaultRequestTargetTest.java