diff --git a/Dockerfile.phpunit b/Dockerfile.phpunit
new file mode 100644
index 0000000000..77e5ed2013
--- /dev/null
+++ b/Dockerfile.phpunit
@@ -0,0 +1,39 @@
+FROM ubuntu:18.04
+ENV DEBIAN_FRONTEND noninteractive
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+		software-properties-common \
+	&& apt-get clean \
+	&& rm -fr /var/lib/apt/lists/*
+
+RUN add-apt-repository ppa:ondrej/php
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+            curl \
+            php5.6 \
+            php5.6-gd \
+            php5.6-mbstring \
+            php5.6-json \
+            php5.6-mysql \
+            php5.6-zip \
+            php5.6-xml \
+            php5.6-curl \
+            php5.6-opcache \
+            php5.6-memcache \
+        && apt-get clean \
+        && rm -fr /var/lib/apt/lists/* 
+
+RUN mkdir /app && mkdir /app/pleio && curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+
+WORKDIR /app
+COPY composer.json composer.json /app/
+COPY mod/pleio/composer.json /app/pleio/
+
+ARG COMPOSER_ALLOW_SUPERUSER=1
+ARG COMPOSER_NO_INTERACTION=1
+RUN composer config --no-plugins allow-plugins.composer/installers true
+RUN composer install
+
+WORKDIR /app/pleio
+RUN composer install
+
diff --git a/azure-pipelines-PR.yaml b/azure-pipelines-PR.yaml
index f72168e45b..365058cd2e 100644
--- a/azure-pipelines-PR.yaml
+++ b/azure-pipelines-PR.yaml
@@ -1,5 +1,5 @@
-trigger:  # don't trigger outside PRs
-- none
+trigger:
+- '*'
 
 pr:  # Trigger the pipeline only for PRs targeting master branch
 - master
@@ -15,9 +15,29 @@ pool:
   vmImage: 'ubuntu-latest'
 
 
+
 jobs:
+- job: unittests
+  displayName: run phpunit tests
+  container: phanoix/collab-pipeline:latest
+  steps:
+  - script: |
+      rm composer.lock
+      composer config --no-plugins allow-plugins.composer/installers true
+      composer install
+      ls -l
+      ls -l ./vendor/bin/
+      cd mod && ../vendor/bin/phpunit --log-junit ../PHPunit_results.xml
+
+  - task: PublishTestResults@2
+    inputs:
+      testResultsFormat: 'JUnit'
+      testResultsFiles: '**/PHPunit_results.xml'
+      testRunTitle: phpunit tests
+
 - job: setup
   displayName: build and set up review site
+  condition: and(succeeded(), eq(variables['Build.Reason'], 'PullRequest'))  # don't trigger outside PRs
   steps:
   - task: Docker@2
     displayName: Build and Push Container image to ACR