How was the first release of JDK Unit Tested?

Can someone please explain the following

1. How was the开发者_运维百科 first JDK release unit Tested? Since Junit came after Java how did they do it?
2. Are the current releases using Junit to test the JDK API?

Regards

The JDK is tested , at least now, using jtreg . I am not aware of any usage of JUnit to test the JDK.

1. Unit testing is a concept and a practice. It is not a package or specific implementation thereof (although it was admittedly popularised by JUnit).

2. I don't know what's the Sun, Oracle :-), standard is for testing. I'm sure it's pretty thorough though. Bear in mind there is more than on JDK publisher.

I imagine that the very first JDKs (pre Java 1.0) were tested using a harness implemented using other technologies; e.g. C, shell scripting, and so forth.

Certainly Java unit testing was done in Java well before JUnit came along. I remember using a framework developed in-house at DSTC in the late 1990s, and the GNU Classpath project used a framework called Mauve. Java test frameworks are not rocket science.