diff --git a/tests/mods/01-test-modules.sh b/tests/mods/01-test-modules.sh
new file mode 100755
index 0000000..e52138b
--- /dev/null
+++ b/tests/mods/01-test-modules.sh
@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -e
+set -u
+set -o pipefail
+
+CWD="$(cd -P -- "$(dirname -- "$0")" && pwd -P)"
+
+IMAGE="${1}"
+VERSION="${2}"
+FLAVOUR="${3}"
+
+
+# shellcheck disable=SC1090
+. "${CWD}/../.lib.sh"
+
+
+# -------------------------------------------------------------------------------------------------
+# Testing
+# -------------------------------------------------------------------------------------------------
+
+ERROR=0
+for dir in $( ls -1 "${CWD}/modules/" ); do
+	if ! "${CWD}/modules.sh" "${IMAGE}" "${VERSION}" "${FLAVOUR}" "${dir}"; then
+		ERROR="$(( ERROR + 1 ))"
+	fi
+done
+
+exit "${ERROR}"
diff --git a/tests/mods/modules.sh b/tests/mods/modules.sh
new file mode 100755
index 0000000..b293576
--- /dev/null
+++ b/tests/mods/modules.sh
@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+
+set -e
+set -u
+set -o pipefail
+
+CWD="$(cd -P -- "$(dirname -- "$0")" && pwd -P)"
+
+if [ "${#}" != "4" ]; then
+	>&2 echo "Error, requires 4 arguments: <IMAGE> <VERSION> <FLAVOUR> <MODULE>"
+	exit 1
+fi
+
+IMAGE="${1}"
+VERSION="${2}"
+FLAVOUR="${3}"
+MODULE="${4}"
+
+# shellcheck disable=SC1090
+. "${CWD}/../.lib.sh"
+
+
+SKIP_GD=("")
+
+
+echo
+echo "# ------------------------------------------------------------"
+echo "# Testing: ${MODULE}"
+echo "# ------------------------------------------------------------"
+echo
+
+
+# -------------------------------------------------------------------------------------------------
+# Check skipping
+# -------------------------------------------------------------------------------------------------
+
+if [[ ${SKIP_GD[*]} =~ ${VERSION} ]]; then
+	echo "Skipping '${MODULE}' checks for PHP ${VERSION}"
+	exit 0
+fi
+
+
+# -------------------------------------------------------------------------------------------------
+# Testing
+# -------------------------------------------------------------------------------------------------
+
+WORKDIR="/tmp/${MODULE}"
+docker run \
+	--rm \
+	-e DEBUG_ENTRYPOINT=0 \
+	-e NEW_UID="$(id -u)" \
+	-e NEW_GID="$(id -g)" \
+	-v "${CWD}/modules/${MODULE}:${WORKDIR}" \
+	--entrypoint=sh \
+	--workdir="${WORKDIR}" \
+	"${IMAGE}:${VERSION}-${FLAVOUR}" \
+	-c 'find . -name "*.php" -type f -print0 | xargs -0 -n1 sh -c "
+		set -e
+		set -u
+		if [ -f \"\${1:-}\" ]; then
+			fail=0
+			printf \"[TEST] %s\" \"\${1}\"
+
+			if script -e -c \"php \${1}\" /dev/null 2>&1 | grep -Ei \"core|segmentation|fatal|except|err|warn|notice\" 2>&1 >/dev/null; then
+				fail=1
+			fi
+			if ! php \"\${1}\" 2>&1 | grep -E \"^OK$\" 2>&1 >/dev/null; then
+				fail=1
+			fi
+
+			if [ \"\${fail}\" != \"0\" ]; then
+				printf \"\\r[FAIL] %s\\n\" \"\${1}\"
+				php \"\${1}\" || true
+				exit 1
+			else
+				printf \"\\r[OK]   %s\\n\" \"\${1}\"
+			fi
+		fi
+
+	" --'
diff --git a/tests/mods/modules/bcmath/bcmath.php b/tests/mods/modules/bcmath/bcmath.php
new file mode 100644
index 0000000..0e318e6
--- /dev/null
+++ b/tests/mods/modules/bcmath/bcmath.php
@@ -0,0 +1,26 @@
+<?php
+/**
+ * This page should print 'OK' if everything works,
+ * 'FAIL' or nothing if an error occured.
+ */
+ini_set('display_startup_errors', 1);
+ini_set('display_errors', 1);
+error_reporting(-1);
+
+$a = '1.234';
+$b = '5';
+
+$num1 = bcadd($a, $b);     // 6
+$num2 = bcadd($a, $b, 4);  // 6.2340
+
+if ($num1 != 6) {
+	echo 'FAIL: ' . $num1;
+	exit(1);
+}
+
+if ($num2 != 6.2340) {
+	echo 'FAIL: ' . $num2;
+	exit(1);
+}
+
+echo 'OK';
diff --git a/tests/mods/modules/gd/gd-jpeg.php b/tests/mods/modules/gd/gd-jpeg.php
new file mode 100644
index 0000000..01816e3
--- /dev/null
+++ b/tests/mods/modules/gd/gd-jpeg.php
@@ -0,0 +1,67 @@
+<?php
+/**
+ * This page should print 'OK' if everything works,
+ * 'FAIL' or nothing if an error occured.
+ */
+ini_set('display_startup_errors', 1);
+ini_set('display_errors', 1);
+error_reporting(-1);
+
+// Create a blank image and add some text
+if ( ($im = imagecreatetruecolor(640, 480)) === FALSE ) {
+	echo 'FAIL: imagecreatetruecolor()';
+	exit(1);
+}
+
+// First we create our stamp image manually from GD
+if ( ($stamp = imagecreatetruecolor(100, 70)) === FALSE ) {
+	echo 'FAIL: imagecreatetruecolor()';
+	exit(1);
+}
+
+if (!imagefilledrectangle($stamp, 0, 0, 99, 69, 0x0000FF)) {
+	echo 'FAIL: imagefilledrectangle()';
+	exit(1);
+}
+if (!imagefilledrectangle($stamp, 9, 9, 90, 60, 0xFFFFFF)) {
+	echo 'FAIL: imagefilledrectangle()';
+	exit(1);
+}
+
+if (!imagestring($stamp, 5, 20, 20, 'libGD', 0x0000FF)) {
+	echo 'FAIL: imagestring()';
+	exit(1);
+}
+if (!imagestring($stamp, 3, 20, 40, '(c) 2007-9', 0x0000FF)) {
+	echo 'FAIL: imagestring()';
+	exit(1);
+}
+
+
+// Set the margins for the stamp and get the height/width of the stamp image
+$marge_right = 10;
+$marge_bottom = 10;
+$sx = imagesx($stamp);
+$sy = imagesy($stamp);
+
+// Merge the stamp onto our photo with an opacity of 50%
+if (!imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 50)) {
+	echo 'FAIL: imagecopymerge()';
+	exit(1);
+}
+
+// Save the image to file and free memory
+if (!imagejpeg($im, 'image.jpg')) {
+	echo 'FAIL: imagejpeg()';
+	exit(1);
+}
+if (!imagedestroy($im)) {
+	echo 'FAIL: imagedestroy()';
+	unlink('image.jpg');
+	exit(1);
+}
+
+// Remove image after test
+unlink('image.jpg');
+
+echo 'OK';
diff --git a/tests/mods/modules/gd/gd-png.php b/tests/mods/modules/gd/gd-png.php
new file mode 100644
index 0000000..2d69747
--- /dev/null
+++ b/tests/mods/modules/gd/gd-png.php
@@ -0,0 +1,67 @@
+<?php
+/**
+ * This page should print 'OK' if everything works,
+ * 'FAIL' or nothing if an error occured.
+ */
+ini_set('display_startup_errors', 1);
+ini_set('display_errors', 1);
+error_reporting(-1);
+
+// Create a blank image and add some text
+if ( ($im = imagecreatetruecolor(640, 480)) === FALSE ) {
+	echo 'FAIL: imagecreatetruecolor()';
+	exit(1);
+}
+
+// First we create our stamp image manually from GD
+if ( ($stamp = imagecreatetruecolor(100, 70)) === FALSE ) {
+	echo 'FAIL: imagecreatetruecolor()';
+	exit(1);
+}
+
+if (!imagefilledrectangle($stamp, 0, 0, 99, 69, 0x0000FF)) {
+	echo 'FAIL: imagefilledrectangle()';
+	exit(1);
+}
+if (!imagefilledrectangle($stamp, 9, 9, 90, 60, 0xFFFFFF)) {
+	echo 'FAIL: imagefilledrectangle()';
+	exit(1);
+}
+
+if (!imagestring($stamp, 5, 20, 20, 'libGD', 0x0000FF)) {
+	echo 'FAIL: imagestring()';
+	exit(1);
+}
+if (!imagestring($stamp, 3, 20, 40, '(c) 2007-9', 0x0000FF)) {
+	echo 'FAIL: imagestring()';
+	exit(1);
+}
+
+
+// Set the margins for the stamp and get the height/width of the stamp image
+$marge_right = 10;
+$marge_bottom = 10;
+$sx = imagesx($stamp);
+$sy = imagesy($stamp);
+
+// Merge the stamp onto our photo with an opacity of 50%
+if (!imagecopymerge($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp), 50)) {
+	echo 'FAIL: imagecopymerge()';
+	exit(1);
+}
+
+// Save the image to file and free memory
+if (!imagepng($im, 'image.png')) {
+	echo 'FAIL: imagepng()';
+	exit(1);
+}
+if (!imagedestroy($im)) {
+	echo 'FAIL: imagedestroy()';
+	unlink('image.png');
+	exit(1);
+}
+
+// Remove image after test
+unlink('image.png');
+
+echo 'OK';
diff --git a/tests/mods/modules/gd/gd-webp.php b/tests/mods/modules/gd/gd-webp.php
new file mode 100644
index 0000000..fa65964
--- /dev/null
+++ b/tests/mods/modules/gd/gd-webp.php
@@ -0,0 +1,50 @@
+<?php
+/**
+ * This page should print 'OK' if everything works,
+ * 'FAIL' or nothing if an error occured.
+ */
+ini_set('display_startup_errors', 1);
+ini_set('display_errors', 1);
+error_reporting(-1);
+
+
+// Only available since 5.4.0
+if (version_compare(PHP_VERSION, '5.4.0', '<')) {
+	echo 'OK';
+	exit(0);
+}
+
+
+// Create a blank image and add some text
+if ( ($im = imagecreatetruecolor(120, 20)) === FALSE ) {
+	echo 'FAIL: imagecreatetruecolor()';
+	exit(1);
+}
+
+if ( ($text_color = imagecolorallocate($im, 233, 14, 91)) === FALSE ) {
+	echo 'FAIL: imagecolorallocate()';
+	exit(1);
+}
+
+if (!imagestring($im, 1, 5, 5,  'WebP with PHP', $text_color)) {
+	echo 'FAIL: imagestring()';
+	exit(1);
+}
+
+// Save the image
+if (!imagewebp($im, 'image.webp')) {
+	echo 'FAIL: imagewebp()';
+	exit(1);
+}
+
+// Free up memory
+if (!imagedestroy($im)) {
+	echo 'FAIL: imagedestroy()';
+	unlink('image.webp');
+	exit(1);
+}
+
+// Remove image after test
+unlink('image.webp');
+
+echo 'OK';
diff --git a/tests/mods/modules/imagick/imagick.php b/tests/mods/modules/imagick/imagick.php
new file mode 100644
index 0000000..c5bdd56
--- /dev/null
+++ b/tests/mods/modules/imagick/imagick.php
@@ -0,0 +1,40 @@
+<?php
+/**
+ * This page should print 'OK' if everything works,
+ * 'FAIL' or nothing if an error occured.
+ */
+ini_set('display_startup_errors', 1);
+ini_set('display_errors', 1);
+error_reporting(-1);
+
+/* Set width and height in proportion of genuine PHP logo */
+$width = 400;
+$height = 210;
+
+/* Create an Imagick object with transparent canvas */
+$img = new Imagick();
+
+if ($img->newImage($width, $height, new ImagickPixel('transparent')) !== TRUE) {
+	echo 'FAIL: imagecreatetruecolor()';
+	exit(1);
+}
+
+/* New ImagickDraw instance for ellipse draw */
+$draw = new ImagickDraw();
+/* Set purple fill color for ellipse */
+$draw->setFillColor('#777bb4');
+/* Set ellipse dimensions */
+$draw->ellipse($width / 2, $height / 2, $width / 2, $height / 2, 0, 360);
+/* Draw ellipse onto the canvas */
+$img->drawImage($draw);
+
+/* Reset fill color from purple to black for text (note: we are reusing ImagickDraw object) */
+$draw->setFillColor('black');
+
+if ($img->setImageFormat('png') !== TRUE) {
+	echo 'FAIL: imagecreatetruecolor()';
+	exit(1);
+}
+
+
+echo 'OK';