diff --git a/base-notebook/Dockerfile b/base-notebook/Dockerfile
index 020cd41a..9e1edcfa 100644
--- a/base-notebook/Dockerfile
+++ b/base-notebook/Dockerfile
@@ -3,7 +3,8 @@
 
 # Ubuntu 18.04 (bionic)
 # https://hub.docker.com/_/ubuntu/?tab=tags&name=bionic
-ARG BASE_CONTAINER=ubuntu:bionic-20200112@sha256:bc025862c3e8ec4a8754ea4756e33da6c41cba38330d7e324abd25c8e0b93300
+ARG ROOT_CONTAINER=ubuntu:bionic-20200112@sha256:bc025862c3e8ec4a8754ea4756e33da6c41cba38330d7e324abd25c8e0b93300
+ARG BASE_CONTAINER=$ROOT_CONTAINER
 FROM $BASE_CONTAINER
 
 LABEL maintainer="Jupyter Project <jupyter@googlegroups.com>"
diff --git a/base-notebook/test/test_pandoc.py b/base-notebook/test/test_pandoc.py
new file mode 100644
index 00000000..103f418a
--- /dev/null
+++ b/base-notebook/test/test_pandoc.py
@@ -0,0 +1,20 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import logging
+
+import pytest
+
+LOGGER = logging.getLogger(__name__)
+
+
+def test_pandoc(container):
+    """Pandoc shall be able to convert MD to HTML."""
+    c = container.run(
+        tty=True, command=["start.sh", "bash", "-c", 'echo "**BOLD**" | pandoc']
+    )
+    c.wait(timeout=10)
+    logs = c.logs(stdout=True).decode("utf-8")
+    LOGGER.debug(logs)
+    assert "<p><strong>BOLD</strong></p>" in logs
+
diff --git a/docs/contributing/features.md b/docs/contributing/features.md
index 1dca0d2c..79511e5b 100644
--- a/docs/contributing/features.md
+++ b/docs/contributing/features.md
@@ -26,7 +26,7 @@ If there's agreement that the feature belongs in one or more of the core stacks:
 1. Implement the feature in a local clone of the `jupyter/docker-stacks` project.
 2. Please build the image locally before submitting a pull request. Building the image locally shortens the debugging cycle by taking some load off [Travis CI](http://travis-ci.org/), which graciously provides free build services for open source projects like this one.  If you use `make`, call:
 ```
-make image/somestack-notebook
+make build/somestack-notebook
 ```
 3. [Submit a pull request](https://github.com/PointCloudLibrary/pcl/wiki/A-step-by-step-guide-on-preparing-and-submitting-a-pull-request) (PR) with your changes.
 4. Watch for Travis to report a build success or failure for your PR on GitHub.
diff --git a/docs/contributing/packages.md b/docs/contributing/packages.md
index 11828a8b..ef9e8b55 100644
--- a/docs/contributing/packages.md
+++ b/docs/contributing/packages.md
@@ -8,7 +8,7 @@ Please follow the process below to update a package version:
 2. Adjust the version number for the package. We prefer to pin the major and minor version number of packages so as to minimize rebuild side-effects when users submit pull requests (PRs). For example, you'll find the Jupyter Notebook package, `notebook`, installed using conda with `notebook=5.4.*`.
 3. Please build the image locally before submitting a pull request. Building the image locally shortens the debugging cycle by taking some load off [Travis CI](http://travis-ci.org/), which graciously provides free build services for open source projects like this one. If you use `make`, call:
 ```
-make image/somestack-notebook
+make build/somestack-notebook
 ```
 4. [Submit a pull request](https://github.com/PointCloudLibrary/pcl/wiki/A-step-by-step-guide-on-preparing-and-submitting-a-pull-request) (PR) with your changes.
 5. Watch for Travis to report a build success or failure for your PR on GitHub.
diff --git a/docs/contributing/tests.md b/docs/contributing/tests.md
index c2ff4f35..80d2786d 100644
--- a/docs/contributing/tests.md
+++ b/docs/contributing/tests.md
@@ -14,7 +14,7 @@ Please follow the process below to add new tests:
 2. If your test should run against a single image, add your test code to one of the modules in `some-notebook/test/` or create a new module.
 3. Build one or more images you intend to test and run the tests locally. If you use `make`, call:
 ```
-make image/somestack-notebook
+make build/somestack-notebook
 make test/somestack-notebook
 ```
 4. [Submit a pull request](https://github.com/PointCloudLibrary/pcl/wiki/A-step-by-step-guide-on-preparing-and-submitting-a-pull-request) (PR) with your changes.
diff --git a/minimal-notebook/Dockerfile b/minimal-notebook/Dockerfile
index a706eefc..5d80dfb9 100644
--- a/minimal-notebook/Dockerfile
+++ b/minimal-notebook/Dockerfile
@@ -19,14 +19,14 @@ RUN apt-get update && apt-get install -yq --no-install-recommends \
     libxrender1 \
     lmodern \
     netcat \
-    pandoc \
     python-dev \
-    texlive-fonts-extra \
+    # ---- nbconvert dependencies ----
+    texlive-xetex \
     texlive-fonts-recommended \
     texlive-generic-recommended \
-    texlive-latex-base \
-    texlive-latex-extra \
-    texlive-xetex \
+    # Optional dependency
+    texlive-fonts-extra \
+    # ----
     tzdata \
     unzip \
     nano \
diff --git a/minimal-notebook/test/data/notebook1.ipynb b/minimal-notebook/test/data/notebook1.ipynb
new file mode 100644
index 00000000..0ee2ca07
--- /dev/null
+++ b/minimal-notebook/test/data/notebook1.ipynb
@@ -0,0 +1,149 @@
+{
+ "metadata": {
+  "name": "notebook1"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "A simple SymPy example"
+     ]
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "First we import SymPy and initialize printing:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from sympy import init_printing\n",
+      "from sympy import *\n",
+      " init_printing()"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Create a few symbols:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "x,y,z = symbols('x y z')"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "markdown",
+     "metadata": {},
+     "source": [
+      "Here is a basic expression:"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "e = x**2 + 2.0*y + sin(z); e"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "latex": [
+        "$$x^{2} + 2.0 y + \\sin{\\left (z \\right )}$$"
+       ],
+       "metadata": {},
+       "output_type": "pyout",
+       "png": "iVBORw0KGgoAAAANSUhEUgAAAKMAAAAZBAMAAACvE4OgAAAAMFBMVEX///8AAAAAAAAAAAAAAAAA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\nSUVORK5CYII=\n",
+       "prompt_number": 6,
+       "text": [
+        " 2                 \n",
+        "x  + 2.0\u22c5y + sin(z)"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "diff(e, x)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "latex": [
+        "$$2 x$$"
+       ],
+       "metadata": {},
+       "output_type": "pyout",
+       "png": "iVBORw0KGgoAAAANSUhEUgAAABQAAAAOBAMAAADd6iHDAAAAMFBMVEX///8AAAAAAAAAAAAAAAAA\nAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAv3aB7AAAAD3RSTlMAIpm7MhCriUTv3c12\nVGZoascqAAAAgElEQVQIHWNgVDJ2YICAMAb2H1BmKgPDTChzFgNDvgOEvT8AzgQKrA9gPZPYUwNk\ncXxnCGd4dWA1kMllwFDKUB9wEchUZmAIYNgMZDDwJIDIPyDiEgOjAAPLFwZWBhYFBh6BqzwfGI4y\nSJUXZXH8Zf7A+IBh////v1hzjh5/xwAAW80hUDE8HYkAAAAASUVORK5CYII=\n",
+       "prompt_number": 7,
+       "text": [
+        "2\u22c5x"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "integrate(e, z)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "latex": [
+        "$$x^{2} z + 2.0 y z - \\cos{\\left (z \\right )}$$"
+       ],
+       "metadata": {},
+       "output_type": "pyout",
+       "png": "iVBORw0KGgoAAAANSUhEUgAAALsAAAAZBAMAAACbakK8AAAAMFBMVEX///8AAAAAAAAAAAAAAAAA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\nYII=\n",
+       "prompt_number": 8,
+       "text": [
+        " 2                     \n",
+        "x \u22c5z + 2.0\u22c5y\u22c5z - cos(z)"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file
diff --git a/minimal-notebook/test/test_nbconvert.py b/minimal-notebook/test/test_nbconvert.py
new file mode 100644
index 00000000..653deae9
--- /dev/null
+++ b/minimal-notebook/test/test_nbconvert.py
@@ -0,0 +1,31 @@
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+
+import logging
+
+import pytest
+import os
+
+LOGGER = logging.getLogger(__name__)
+
+
+@pytest.mark.parametrize("format", ["html", "pdf"])
+def test_nbconvert(container, format):
+    """Check if nbconvert is able to convert a notebook file"""
+    host_data_dir = os.path.join(os.path.dirname(os.path.realpath(__file__)), "data")
+    cont_data_dir = "/home/jovyan/data"
+    test_file = "notebook1"
+    output_dir = "/tmp"
+    LOGGER.info(f"Converting example notebook to {format.upper()} ...")
+    command = f"jupyter nbconvert {cont_data_dir}/{test_file}.ipynb --output-dir {output_dir} --to {format}"
+    c = container.run(
+        volumes={host_data_dir: {"bind": cont_data_dir, "mode": "ro"}},
+        tty=True,
+        command=["start.sh", "bash", "-c", command],
+    )
+    rv = c.wait(timeout=30)
+    assert rv == 0 or rv["StatusCode"] == 0
+    logs = c.logs(stdout=True).decode("utf-8")
+    LOGGER.debug(logs)
+    assert f"{output_dir}/{test_file}.{format}" in logs
+
diff --git a/pyspark-notebook/Dockerfile b/pyspark-notebook/Dockerfile
index f2dea592..ae10374e 100644
--- a/pyspark-notebook/Dockerfile
+++ b/pyspark-notebook/Dockerfile
@@ -15,8 +15,10 @@ RUN apt-get -y update && \
     apt-get install --no-install-recommends -y openjdk-8-jre-headless ca-certificates-java && \
     rm -rf /var/lib/apt/lists/*
 
+# Using the preferred mirror to download the file
 RUN cd /tmp && \
-    wget -q http://mirrors.ukfast.co.uk/sites/ftp.apache.org/spark/spark-${APACHE_SPARK_VERSION}/spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz && \
+    wget -q $(wget -qO- https://www.apache.org/dyn/closer.lua/spark/spark-${APACHE_SPARK_VERSION}/spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz\?as_json | \
+    python -c "import sys, json; content=json.load(sys.stdin); print(content['preferred']+content['path_info'])") && \
     echo "2426a20c548bdfc07df288cd1d18d1da6b3189d0b78dee76fa034c52a4e02895f0ad460720c526f163ba63a17efae4764c46a1cd8f9b04c60f9937a554db85d2 *spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz" | sha512sum -c - && \
     tar xzf spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz -C /usr/local --owner root --group root --no-same-owner && \
     rm spark-${APACHE_SPARK_VERSION}-bin-hadoop${HADOOP_VERSION}.tgz
@@ -36,11 +38,11 @@ RUN apt-get -y update && \
     rm -rf /var/lib/apt/lists/*
 
 # Spark and Mesos config
-ENV SPARK_HOME=/usr/local/spark \
-    PYTHONPATH=$SPARK_HOME/python:$SPARK_HOME/python/lib/py4j-0.10.7-src.zip \
+ENV SPARK_HOME=/usr/local/spark
+ENV PYTHONPATH=$SPARK_HOME/python:$SPARK_HOME/python/lib/py4j-0.10.7-src.zip \
     MESOS_NATIVE_LIBRARY=/usr/local/lib/libmesos.so \
     SPARK_OPTS="--driver-java-options=-Xms1024M --driver-java-options=-Xmx4096M --driver-java-options=-Dlog4j.logLevel=info" \
-    PATH=$PATH:/usr/local/spark/bin
+    PATH=$PATH:$SPARK_HOME/bin
 
 USER $NB_UID
 
diff --git a/pyspark-notebook/test/test_spark.py b/pyspark-notebook/test/test_spark.py
index 2b5499ae..a09d0256 100644
--- a/pyspark-notebook/test/test_spark.py
+++ b/pyspark-notebook/test/test_spark.py
@@ -16,4 +16,15 @@ def test_spark_shell(container):
     c.wait(timeout=30)
     logs = c.logs(stdout=True).decode('utf-8')
     LOGGER.debug(logs)
-    assert 'res0: Int = 2' in logs
\ No newline at end of file
+    assert 'res0: Int = 2' in logs
+
+def test_pyspark(container):
+    """PySpark should be in the Python path"""
+    c = container.run(
+        tty=True,
+        command=['start.sh', 'python', '-c', '"import pyspark"']
+    )
+    rv = c.wait(timeout=30)
+    assert rv == 0 or rv["StatusCode"] == 0
+    logs = c.logs(stdout=True).decode('utf-8')
+    LOGGER.debug(logs)
diff --git a/pytest.ini b/pytest.ini
index bf9c450c..65f4b5fe 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,4 +1,5 @@
 [pytest]
+addopts = -rA
 log_cli = 1
 log_cli_level = INFO
 log_cli_format = %(asctime)s [%(levelname)8s] %(message)s (%(filename)s:%(lineno)s)