update comments, add configureFirewall test

* Comments to clarify some of the existing tests
* mock_command to allow recording of calls and mocking return calls in bash
* new configureFirewall test (only the first one of it's many paths)

test/test_automated_install.py

@@ -11,7 +11,8 @@ SETUPVARS = {
 
 def test_setupVars_are_sourced_to_global_scope(Pihole):
     ''' currently update_dialogs sources setupVars with a dot,
-    then various other functions use the variables '''
+    then various other functions use the variables.
+    This confirms the sourced variables are in scope between functions '''
     setup_var_file = 'cat <<EOF> /etc/pihole/setupVars.conf\n'
     for k,v in SETUPVARS.iteritems():
         setup_var_file += "{}={}\n".format(k, v)
@@ -64,6 +65,42 @@ def test_setupVars_saved_to_file(Pihole):
     for k,v in SETUPVARS.iteritems():
         assert "{}={}".format(k, v) in output
 
+def test_configureFirewall_firewalld_no_errors(Pihole):
+    ''' confirms firewalld rules are applied when appopriate '''
+    mock_command('firewall-cmd', '0', Pihole)
+    configureFirewall = Pihole.run('''
+    bash -c "
+    PHTEST=TRUE
+    source /opt/pihole/basic-install.sh
+    configureFirewall
+    " ''')
+    expected_stdout = '::: Configuring firewalld for httpd and dnsmasq.'
+    assert expected_stdout in configureFirewall.stdout
+    firewall_calls = Pihole.run('cat /var/log/firewall-cmd').stdout
+    assert 'firewall-cmd --state' in firewall_calls
+    assert 'firewall-cmd --permanent --add-port=80/tcp' in firewall_calls
+    assert 'firewall-cmd --permanent --add-port=53/tcp' in firewall_calls
+    assert 'firewall-cmd --permanent --add-port=53/udp' in firewall_calls
+    assert 'firewall-cmd --reload' in firewall_calls
+
+
+# Helper functions
+def mock_command(script, result, container):
+    ''' Allows for setup of commands we don't really want to have to run for real in unit tests '''
+    ''' TODO: support array of results that enable the results to change over multiple executions of a command '''
+    full_script_path = '/usr/local/bin/{}'.format(script)
+    mock_script = dedent('''\
+    #!/bin/bash -e
+    echo "\$0 \$@" >> /var/log/{script}
+    exit {retcode}
+    '''.format(script=script, retcode=result))
+    container.run('''
+    cat <<EOF> {script}\n{content}\nEOF
+    chmod +x {script}
+    '''.format(script=full_script_path, content=mock_script))
+    print container.run('cat {}'.format(full_script_path)).stdout
+
+
 def run_script(Pihole, script, file="/test.sh"):
     _write_test_script(Pihole, script, file=file)
     result = Pihole.run(file)