Test platform

[maraf]

Provide basic infrastructure for testing template parser and tag libraries.

• Custom module in this repo
  • Headless (from command line) or hosted on http server
  • Have db snapshot that it always imports before starting the tests
  • Use admin to create custom entities etc
  • For tests changing db state, always restore after test?
• Tag library for test definitions
• Tag library for asserting outputs
  • Assert property values
  • Assert generated output
  • Trim leading/trailing whitespaces

<test:group name="libraries">
    <test:group name="variable">
        <test:case name="set">
            <php:set property="var:x" value="1" />

            <assert:equals expected="1" actual="var:x" />
        </test:case>
    </test:group>
</test:group>