Make it easier to run the unit tests

.gitignore

@@ -1,2 +1,3 @@
 composer.lock
 vendor
+.phpunit.result.cache

README.md

@@ -58,6 +58,9 @@ register_shutdown_function(function() {
 })
 ```
 
+## Testing
+Have docker installed, and run `./test.sh`
+
 ## Instrumentation for Tracing
 
 Since this tracer is fully compliant with the OpenTracing API 1.0, all code instrumentation should only use the API itself, as descriped in the [opentracing-php](https://github.com/opentracing/opentracing-php) documentation.

phpunit.xml

@@ -19,4 +19,9 @@
         timeoutForMediumTests="10"
         timeoutForLargeTests="60"
         verbose="false">
+        <testsuites>
+                <testsuite name="jaeger-client-php">
+                        <directory>./tests</directory>
+                </testsuite>
+        </testsuites>
 </phpunit>

test.Dockerfile

@@ -0,0 +1,16 @@
+FROM php:8.0.26-alpine3.16
+
+WORKDIR /bin
+
+# install the sockets php extension
+RUN docker-php-ext-install sockets
+
+# install composer
+RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && \
+	php -r "if (hash_file('sha384', 'composer-setup.php') === '55ce33d7678c5a611085589f1f3ddf8b3c52d662cd01d4ba75c0ee0459970c2200a51f492d557530c71c15d8dba01eae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" && \
+	php composer-setup.php && \
+	php -r "unlink('composer-setup.php');"
+
+WORKDIR /app
+
+ENTRYPOINT ["php", "/bin/composer.phar"]

test.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+set -e # Fail fast
+
+LOCAL_DIR=$(cd "$(dirname "$BASH_SOURCE")" && pwd)
+BUILDER_IMAGE=jaeger-client-php-tester
+
+if [[ "$(docker images -q $BUILDER_IMAGE 2> /dev/null)" == "" ]]; then
+	echo "--Creating builder image"
+	docker build --no-cache --file test.Dockerfile --tag $BUILDER_IMAGE .
+fi
+
+if [ ! -d "$LOCAL_DIR/vendor" ]; then
+	echo "--No vendor directory detected. Running a composer install"
+	docker run --rm \
+		--volume $LOCAL_DIR:/app \
+		$BUILDER_IMAGE \
+		install
+fi
+
+echo "--Running tests"
+docker run --rm \
+	--volume $LOCAL_DIR:/app \
+	$BUILDER_IMAGE \
+	test