Add Dockerfile for unit tests.

.dockerignore

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+.git
+

Dockerfile

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+# This Dockerfile can be used to create a Docker image/container
+# that runs the unit tests on the LinkTitles extension.
+FROM mediawiki:1.32
+MAINTAINER Daniel Kraus (https://www.bovender.de)
+RUN apt update -yqq && \
+    apt install -yqq \
+	php7.0-sqlite \
+	sqlite3 \
+	unzip \
+	zip
+RUN curl https://raw.githubusercontent.com/composer/getcomposer.org/cb19f2aa3aeaa2006c0cd69a7ef011eb31463067/web/installer -s | php -- --quiet
+RUN php composer.phar install
+
+COPY . /var/www/html/extensions/LinkTitles/
+RUN mkdir /data && chown www-data /data
+
+WORKDIR /var/www/html/maintenance
+RUN php install.php --pass admin --dbtype sqlite --extensions LinkTitles Tests admin
+
+WORKDIR /var/www/html/tests/phpunit
+CMD ["php", "phpunit.php", "--group", "bovender"]

Makefile

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+.PHONY: test
+
+test:
+	docker run -it --rm bovender/linktitles
+
+build-test-container:
+	docker build -t bovender/linktitles .