diff --git a/.gitignore b/.gitignore
index 8b2889a..77a99bc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,5 @@ work
 rootfs_overlay_demo/*
 tests
 mender_local_config
+*.xml
+*.html
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5c6a5e1..46863d6 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -55,7 +55,7 @@ test_acceptance:
     - docker version
     # Install dependencies
     - apk --update --no-cache add bash wget git util-linux mtools python
-      py-pip gcc python2-dev libffi-dev libc-dev openssl-dev make
+      py-pip gcc python2-dev libffi-dev libc-dev openssl-dev make sudo
     - pip install "pytest>=3.0" "Fabric>=1.13.0, <2" pytest-html
     # Load image under test
     - export IMAGE_NAME=$DOCKER_REPOSITORY:pr
diff --git a/mender-convert-extract b/mender-convert-extract
index 7713b41..d50f8a4 100755
--- a/mender-convert-extract
+++ b/mender-convert-extract
@@ -19,7 +19,8 @@ echo "Running $(basename $0): $@"
 source modules/bootstrap.sh
 source modules/disk.sh
 
-declare -a configs
+# The mender_convert_config is always used and provides all the defaults
+declare -a configs=("configs/mender_convert_config")
 
 disk_image=""
 while (( "$#" )); do
diff --git a/mender-convert-modify b/mender-convert-modify
index b352e81..48b5250 100755
--- a/mender-convert-modify
+++ b/mender-convert-modify
@@ -39,7 +39,8 @@ source modules/bootstrap.sh
 source modules/disk.sh
 source modules/probe.sh
 
-declare -a configs
+# The mender_convert_config is always used and provides all the defaults
+declare -a configs=("configs/mender_convert_config")
 
 while (( "$#" )); do
   case "$1" in
diff --git a/mender-convert-package b/mender-convert-package
index 9d3489f..14214bf 100755
--- a/mender-convert-package
+++ b/mender-convert-package
@@ -38,7 +38,8 @@ echo "Running $(basename $0): $@"
 source modules/bootstrap.sh
 source modules/disk.sh
 
-declare -a configs
+# The mender_convert_config is always used and provides all the defaults
+declare -a configs=("configs/mender_convert_config")
 
 while (( "$#" )); do
   case "$1" in
diff --git a/modules/config.sh b/modules/config.sh
index ea653cb..e2dafea 100644
--- a/modules/config.sh
+++ b/modules/config.sh
@@ -16,7 +16,6 @@
 
 # Read in the array of config files to process
 read -a configs <<< "${@}"
-configs=( "configs/mender_convert_config" "${configs[@]}" )
 for config in "${configs[@]}"; do
     log_info "Using configuration file: ${config}"
     source "${config}"
diff --git a/scripts/README-run-tests.md b/scripts/README-run-tests.md
index f6b5219..541080e 100644
--- a/scripts/README-run-tests.md
+++ b/scripts/README-run-tests.md
@@ -1,13 +1,16 @@
 # Run tests
 
-Run the following commands to install test dependencies (assumes that all mender-convert dependencies are already installed):
+The tests utilize the provided Docker container in this repository and conversion
+is done using the `docker-mender-convert` command. For this reason we first need
+to build the container (commands must be run from the root directory of
+`mender-convert`):
 
-    sudo apt-get update e2fsprogs=1.44.1-1
-    sudo apt-get -qy --force-yes install python-pip
-    sudo pip2 install pytest --upgrade
-    sudo pip2 install pytest-xdist --upgrade
-    sudo pip2 install pytest-html --upgrade
+```bash
+./docker-build
+```
 
 Run tests:
 
-    ./scripts/run-tests.sh
+```bash
+./scripts/run-tests.sh
+```
diff --git a/scripts/run-tests.sh b/scripts/run-tests.sh
index 4864e27..452725f 100755
--- a/scripts/run-tests.sh
+++ b/scripts/run-tests.sh
@@ -60,25 +60,40 @@ convert_and_test() {
 
     rm -f ${WORKSPACE}/test_config
 
+
+    # Two motives for the following statement
+    #
+    # - speed up tests by avoiding decompression on all images (majority of images
+    #   we test have a platform specific configuration)
+    #
+    # - test providing multiple '--config' options
+    #
+    # - (when no platform configuration is provided) test conversion without
+    #   '--config' and with MENDER_COMPRESS_DISK_IMAGE=y. Compressed disk
+    #   images is the default user facing option and we need to ensure that we
+    #   cover this in the tests.
     if [ -n "${config}" ]; then
-        cp ${config} ${WORKSPACE}/test_config
+        echo "Will disable MENDER_COMPRESS_DISK_IMAGE for this image"
+        echo "MENDER_COMPRESS_DISK_IMAGE=n" > ${WORKSPACE}/test_config
+        local MENDER_CONVERT_EXTRA_ARGS="--config ${config} --config ${WORKSPACE}/test_config"
     fi
 
-    # Disable compression of disk image when testing, otherwise we need to
-    # unpack each image we test which is time consuming
-    echo "MENDER_COMPRESS_DISK_IMAGE=n" >> ${WORKSPACE}/test_config
-
-    echo "Configuration used:"
-    cat ${WORKSPACE}/test_config
-
     MENDER_ARTIFACT_NAME=${artifact_name} ./docker-mender-convert \
         --disk-image input/${image_name} \
-        --config ${WORKSPACE}/test_config
+        ${MENDER_CONVERT_EXTRA_ARGS}
 
     if pip list | grep -q -e pytest-html; then
         html_report_args="--html=${MENDER_CONVERT_DIR}/report_${device_type}.html --self-contained-html"
     fi
 
+    # Need to decompress images built with MENDER_COMPRESS_DISK_IMAGE=y before
+    # running tests.
+    if [ -f deploy/${device_type}-${artifact_name}.sdimg.gz ]; then
+        # sudo is needed because the image is created using docker-mender-convert
+        # which sets root permissions on the image
+        sudo gunzip --force deploy/${device_type}-${artifact_name}.sdimg.gz
+    fi
+
     cd ${WORKSPACE}/mender-image-tests
 
     python2 -m pytest --verbose \