diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5ac76ad2..0329cedb 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -51,6 +51,11 @@ jobs:
             echo "phpstan for tasks"
             vendor/bin/phpstan analyse src --level=2
 
+      # Run internal tests
+      - run:
+          name: Test custom phing commands
+          command: ./run-tests.sh
+
       # Install a drupal test project.
       - run:
           name: Create artifacts directory
diff --git a/.gitignore b/.gitignore
index 0dca1458..b53fe74e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /vendor/
 .idea
+tests/*.txt
\ No newline at end of file
diff --git a/.the-build/build.yml b/.the-build/build.yml
new file mode 100644
index 00000000..be8c9d5a
--- /dev/null
+++ b/.the-build/build.yml
@@ -0,0 +1,61 @@
+# @file
+# Default build configuration properties.
+#
+# This file may be customized for your project. The full set of default values can be
+# found in the-build's repository.
+# @see https://github.com/palantirnet/the-build/blob/release-2.0/defaults.yml
+
+projectname: the-build-test
+
+# These properties are used when building the settings.php and settings.yml for your
+# Drupal site, and by some of the targets in the default build.xml file.
+# @see .the-build/drupal/services.build.yml
+# @see .the-build/drupal/settings.build.php
+build:
+  host: acquia
+
+drupal:
+  root: docroot
+
+  twig:
+    debug: true
+
+  sites:
+    default:
+      # REQUIRED: Name of the sites subdirectory where the `settings.php` file
+      # should live.
+      dir: default
+
+      # REQUIRED: Your site's URI; the default should be the URI of your local
+      # development environment.
+      uri: "localhost"
+
+      # OPTIONAL: Drupal hash salt defaults to "temporary".
+      hash_salt: "12345"
+
+      # OPTIONAL: The Drupal database name defaults to the site's "dir" value.
+      database:
+        database: "drupal"
+
+    # Multisites created by `phing drupal-add-multisite` will be automatically added here.
+    # @multisite_placeholder@
+
+    # Defaults for all sites; these can be overridden for individual sites.
+    _defaults:
+      database:
+        username: "test"
+        password: "test"
+        host: "localhost"
+
+# Putting these flags in configuration allows you to vary the behat configuration per
+# environment. Sometimes, there are tests that are appropriate to skip on CI. Compare
+# these values to the defaults in build.circleci.yml.
+behat:
+  args: "--suite=default --strict"
+
+# To build an artifact from your code, add the URL to your artifact git repository.
+# @see https://github.com/palantirnet/the-build/blob/release-2.0/defaults.yml
+#
+# artifact:
+#   git:
+#     remote:
diff --git a/build.xml b/build.xml
new file mode 100644
index 00000000..6fd11e66
--- /dev/null
+++ b/build.xml
@@ -0,0 +1,97 @@
+<?xml version="1.0"?>
+
+<project name="the-build-tests" default="tests">
+    <!-- Default target: tests -->
+    <target name="tests" description="List available tests.">
+        <exec command="${phing.home}/bin/phing -q -f ${phing.file} -l" passthru="true"/>
+    </target>
+
+    <!-- Add property loading and targets from palantirnet/the-build. -->
+    <import file="targets/the-build.xml" />
+
+    <!-- Make these additional targets available by default. -->
+    <import file="targets/drupal.xml" />
+    <!-- Additional optional targets. -->
+    <import file="targets/artifact.xml" />
+    <import file="targets/acquia.xml" />
+    <import file="targets/styleguide.xml" />
+
+    <target name="run-tests" description="Runs all phing tests">
+        <!-- TODO: these should perhaps return true instead of print success.-->
+        <phingcall target="test-the-build" />
+        <phingcall target="test-set-site" />
+    </target>
+
+    <target name="test-the-build">
+        <loadfile property="result" file="tests/the-build.txt"/>
+        <property name="expected" value="Hello! I'm the-build." />
+        <if>
+            <!-- See https://www.phing.info/guide/chunkhtml/conditions.html -->
+            <contains string="${result}" substring="${expected}" />
+            <then>
+                <echo>the-build test passed</echo>
+            </then>
+            <else>
+                <echo>--Expected--</echo>
+                <echo>[${expected}]</echo>
+                <fail message="the-build test failed -- output below" />
+            </else>
+        </if>
+    </target>
+
+    <target name="test-set-site" depends="set-site">
+        <phingcall target="check-equals">
+            <property name="expected" value="../config/sites/default" />
+            <property name="actual" value="${drupal.site.config_sync_directory}" />
+            <property name="prop_name" value="drupal.site.config_sync_directory" />
+        </phingcall>
+        <phingcall target="check-equals">
+            <property name="expected" value="drupal" />
+            <property name="actual" value="${drupal.site.database.database}" />
+            <property name="prop_name" value="drupal.site.database.database" />
+        </phingcall>        
+        <phingcall target="check-equals">
+            <property name="expected" value="sites/default/files" />
+            <property name="actual" value="${drupal.site.settings.file_public_path}" />
+            <property name="prop_name" value="drupal.site.settings.file_public_path" />
+        </phingcall>
+        <phingcall target="check-equals">
+            <property name="expected" value="../artifacts/private/default" />
+            <property name="actual" value="${drupal.site.settings.file_private_path}" />
+            <property name="prop_name" value="drupal.site.settings.file_private_path" />
+        </phingcall>
+        <phingcall target="check-equals">
+            <property name="expected" value="docroot/sites/default/settings.build.php" />
+            <property name="actual" value="${drupal.site.build.settings_dest}" />
+            <property name="prop_name" value="drupal.site.build.settings_dest" />
+        </phingcall>
+        <phingcall target="check-equals">
+            <property name="expected" value="docroot/sites/default/services.build.yml" />
+            <property name="actual" value="${drupal.site.build.services_dest}" />
+            <property name="prop_name" value="drupal.site.build.services_dest" />
+        </phingcall>
+        <phingcall target="check-equals">
+            <property name="expected" value="localhost" />
+            <property name="actual" value="${drush.uri}" />
+            <property name="prop_name" value="drush.uri" />
+        </phingcall>
+
+        <echo>set-site test passed</echo>
+    </target>
+
+    <target name="check-equals">
+        <echo>Checking ${prop_name}</echo>
+        <if>
+            <not><equals arg1="${expected}" arg2="${actual}" /></not>
+            <then>
+                <echo>${prop_name} test failed</echo>
+                <echo>--Expected--</echo>
+                <echo>${expected}</echo>
+                <echo>--Actual--</echo>
+                <echo>${actual}</echo>
+                <fail message="${prop_name} not set properly" />
+            </then>
+        </if>
+    </target>
+
+</project>
\ No newline at end of file
diff --git a/run-tests.sh b/run-tests.sh
new file mode 100755
index 00000000..cfdfae2a
--- /dev/null
+++ b/run-tests.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Setup tests that read output before testing.
+test='the-build'
+vendor/bin/phing -logfile "tests/$test.txt" $test
+vendor/bin/phing run-tests
diff --git a/tests/.gitkeep b/tests/.gitkeep
new file mode 100644
index 00000000..e69de29b