RFR: JDK-8292990 Improve test coverage for XPath Axes: parent

[Joe Wang]

On Wed, 31 Aug 2022 20:16:33 GMT, Bill Huang <duke at openjdk.org> wrote:

> The goal of this task is validating the parent axis contains the parent of the context node. Context nodes include 
> - root node 
> - element nodes 
> - text nodes 
> - attribute nodes 
> - namespace nodes 
> - comment nodes

test/jaxp/javax/xml/jaxp/unittest/xpath/XPathExpParentTest.java line 56:

> 54:         return new Object[][]{
> 55:                 {"//Customer/parent::*", "//Customers"},
> 56:                 {"//Customer[1]/text()/parent::*", "//Customer"},

I see that the 2nd parameter meant to be the parent, it thus needs to return a single and unique node. But "//Customer" may return multiple nodes.

test/jaxp/javax/xml/jaxp/unittest/xpath/XPathExpParentTest.java line 86:

> 84: 
> 85:                 // parent of document root
> 86:                 {"/.."},

The nature of these two statements seems to be quite different. It might be worth to explain a bit more, a reference to the spec or note from the Slack discussion, sth. that might help the reader of these tests.

test/jaxp/javax/xml/jaxp/unittest/xpath/XPathExpParentTest.java line 145:

> 143: 
> 144:     /**
> 145:      * Verifies that XPath relative expressions provide a parent node.

The context node happens to be the parent node of the 2nd statement. Needs to document it in the description and the params below.

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PR: https://git.openjdk.org/jdk/pull/10107