DBAL-1123 #779 Initialize database schema only once per PHPUnit run

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of deeky666:

Url: #779

Message:

Currently the PHPUnit test suite recreates the database schema on each invocation of TestUtil::getConnection() which is highly inefficient and costly concerning performance, especially on platforms where schema recreation consumes a lot of time.
With this patch the database schema is initilaized once per PHPUnit run, increasing overall test suite runtime significantly.
For example using SQL Anywhere, database creation takes about 4-5 seconds which results in a complete test suite runtime of several minutes. With this patch the complete test suite runs in about 12-15 seconds _!_.

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-779] was assigned:
#779

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-779] was merged:
#779

[doctrinebot]

Issue was closed with resolution "Fixed"

[github-actions]

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