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Unit Testing in Pure XQuery

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README.md

XQUT

Warning - Experimental

The interface and syntax described in this document are experimental and subject to change. Don't let that scare you off, but don't be surprised if the furniture moves around.

Introduction

XQUT is a simple unit test framework in pure XQuery. It is designed to operate in a standalone fashion, called using xdmp:invoke or xdmp:eval. You can, of course, wrap these functions in a module of your own.

The public entry point is the function test or the module xqut.xqy. Pass it an XML element representing a suite of unit tests. Here is an example:

    xquery version "1.0-ml";
    xdmp:invoke(
      'xqut.xqy',
      (xs:QName('SUITE'),
    <suite xmlns="com.blakeley.xqut">
      <unit result="1">1 + 1</unit>
      <unit>
        <expr>1 + 1</expr>
        <result>2</result>
      </unit>
    </suite>),
      <options xmlns="xdmp:eval">
        <root>/Users/nemo/Source/mblakele-xqut/src/</root>
      </options>)

This example shows that the test XML should have a root suite element in the com.blakeley.xqut namespace, and that it may have any number of unit children. Each unit should have either a result attribute, in which case the element text will be evaluated as XQuery, or a pair of expr and result child elements.

You may declare test XML directly, or supply test XML from a document in the database using doc, or on the filesystem or network using xdmp:document-load. The results are XML, so we can use XPath as usual. To see only the failures, for example:

    xquery version "1.0-ml";
    declare namespace xqut="com.blakeley.xqut";

    xdmp:invoke(
      'xqut.xqy',
      (xs:QName('SUITE'),
    <suite xmlns="com.blakeley.xqut">
      <unit result="1">1 + 1</unit>
      <unit>
        <expr>1 + 1</expr>
        <result>2</result>
      </unit>
    </suite>),
      <options xmlns="xdmp:eval">
        <root>/Users/nemo/Source/mblakele-xqut/src/</root>
      </options>)/(xqut:setup-error|xqut:fail)

Options

An environment element can appear inside a suite or unit element, and can be used to specify how each test will be evaluated. These options, expressed as attributes on environment, are passed directly to xdmp:eval.

  • database
  • default-collation
  • default-xquery-version
  • modules
  • user-id
  • root

Certain attributes will be translated automatically from names to ids.

  • database-name to database
  • modules-name to modules
  • user-name to user-id

Besides these xdmp:eval options, each environment element may include any number of library module imports. Each import element must include the following attributes:

  • prefix
  • ns
  • at

For example, we might declare this XML and pass it to test:

    <suite xmlns="com.blakeley.xqut"
      <import
       prefix="foo" ns="com.example.foo" at="lib-foo.xqy"/>
      <unit result="2">1 * 2</unit>
    </suite>

This would cause XQUT to evaluate the following XQuery and compare it to the value of unit/@result:

    import module namespace foo = "com.example.foo" at "lib-foo.xqy";
    1 * 2

There may also be any number of setup elements. The text of each setup element will be evaluated before any unit elements are evaluated. The environment options and imports also apply to setup expressions.

Example

This is a more complex example.

    <suite xmlns="com.blakeley.xqut">
      <environment
       root="/Users/nemo/Source/myproject-xquery/src/"
       database-name="my-database" >
        <import prefix="foo" ns="http://example.com/foo"
                at="/lib-foo.xqy"/>
        <import prefix="bar" ns="http://example.com/bar"
                at="/lib-bar.xqy"/>
      </environment>
      <setup>xdmp:collection-delete('TEST')</setup>
      <setup note="load sample documents">
        for $e in xdmp:filesystem-directory(
          concat(xdmp:modules-root(), '../dist'))/dir:entry[
            ends-with(dir:filename, '.xml')]
        let $uri := concat('/lorem-ipsum/', $e/dir:filename)
        return xdmp:document-load(
        $e/dir:pathname,
        &lt;options xmlns="xdmp:document-load"&gt;
          &lt;uri&gt;{ $uri }&lt;/uri&gt;
          &lt;collections&gt;
            &lt;collection&gt;TEST&lt;/collection&gt;&lt;/collections&gt;
        &lt;/options&gt;)
      </setup>
      <unit result="1" note="check library module imports">1</unit>
      <unit result="23">xdmp:estimate(collection('TEST'))</unit>
      <unit result="17">count(foo:bar('baz'))</unit>
      <unit>
        <expr>foo:bar('baz')[1]</expr>
        <result><fubar><foo/><bar/><baz/></fubar></result>
      </unit>
    </suite>

Limitations

At this time, XQUT does not provide a way to insert other prolog declarations. Patches are welcome.

License Information

Copyright (c) 2011-2012 Michael Blakeley. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

The use of the Apache License does not indicate that this project is affiliated with the Apache Software Foundation.

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