diff --git a/tests/test_functions.sh b/tests/test_functions.sh
index e57948a..126080f 100755
--- a/tests/test_functions.sh
+++ b/tests/test_functions.sh
@@ -1,34 +1,215 @@
 #!/usr/bin/env bash
 
-# Tests for DevStack meta-config functions
+# Tests for DevStack functions
 
 TOP=$(cd $(dirname "$0")/.. && pwd)
 
 # Import common functions
 source $TOP/functions
-source $TOP/tests/unittest.sh
 
-function test_truefalse {
-    local one=1
-    local captrue=True
-    local lowtrue=true
-    local abrevtrue=t
-    local zero=0
-    local capfalse=False
-    local lowfalse=false
-    local abrevfalse=f
-    for against in True False; do
-        for name in one captrue lowtrue abrevtrue; do
-            assert_equal "True" $(trueorfalse $against $name) "\$(trueorfalse $against $name)"
-        done
-    done
-    for against in True False; do
-        for name in zero capfalse lowfalse abrevfalse; do
-            assert_equal "False" $(trueorfalse $against $name) "\$(trueorfalse $against $name)"
-        done
-    done
+# Import configuration
+source $TOP/openrc
+
+
+echo "Testing die_if_not_set()"
+
+bash -cx "source $TOP/functions; X=`echo Y && true`; die_if_not_set X 'not OK'"
+if [[ $? != 0 ]]; then
+    echo "die_if_not_set [X='Y' true] Failed"
+else
+    echo 'OK'
+fi
+
+bash -cx "source $TOP/functions; X=`true`; die_if_not_set X 'OK'"
+if [[ $? = 0 ]]; then
+    echo "die_if_not_set [X='' true] Failed"
+fi
+
+bash -cx "source $TOP/functions; X=`echo Y && false`; die_if_not_set X 'not OK'"
+if [[ $? != 0 ]]; then
+    echo "die_if_not_set [X='Y' false] Failed"
+else
+    echo 'OK'
+fi
+
+bash -cx "source $TOP/functions; X=`false`; die_if_not_set X 'OK'"
+if [[ $? = 0 ]]; then
+    echo "die_if_not_set [X='' false] Failed"
+fi
+
+
+# Enabling/disabling services
+
+echo "Testing enable_service()"
+
+function test_enable_service {
+    local start="$1"
+    local add="$2"
+    local finish="$3"
+
+    ENABLED_SERVICES="$start"
+    enable_service $add
+    if [ "$ENABLED_SERVICES" = "$finish" ]; then
+        echo "OK: $start + $add -> $ENABLED_SERVICES"
+    else
+        echo "changing $start to $finish with $add failed: $ENABLED_SERVICES"
+    fi
 }
 
-test_truefalse
+test_enable_service '' a 'a'
+test_enable_service 'a' b 'a,b'
+test_enable_service 'a,b' c 'a,b,c'
+test_enable_service 'a,b' c 'a,b,c'
+test_enable_service 'a,b,' c 'a,b,c'
+test_enable_service 'a,b' c,d 'a,b,c,d'
+test_enable_service 'a,b' "c d" 'a,b,c,d'
+test_enable_service 'a,b,c' c 'a,b,c'
 
-report_results
+test_enable_service 'a,b,-c' c 'a,b'
+test_enable_service 'a,b,c' -c 'a,b'
+
+function test_disable_service {
+    local start="$1"
+    local del="$2"
+    local finish="$3"
+
+    ENABLED_SERVICES="$start"
+    disable_service "$del"
+    if [ "$ENABLED_SERVICES" = "$finish" ]; then
+        echo "OK: $start - $del -> $ENABLED_SERVICES"
+    else
+        echo "changing $start to $finish with $del failed: $ENABLED_SERVICES"
+    fi
+}
+
+echo "Testing disable_service()"
+test_disable_service 'a,b,c' a 'b,c'
+test_disable_service 'a,b,c' b 'a,c'
+test_disable_service 'a,b,c' c 'a,b'
+
+test_disable_service 'a,b,c' a 'b,c'
+test_disable_service 'b,c' b 'c'
+test_disable_service 'c' c ''
+test_disable_service '' d ''
+
+test_disable_service 'a,b,c,' c 'a,b'
+test_disable_service 'a,b' c 'a,b'
+
+
+echo "Testing disable_all_services()"
+ENABLED_SERVICES=a,b,c
+disable_all_services
+
+if [[ -z "$ENABLED_SERVICES" ]]; then
+    echo "OK"
+else
+    echo "disabling all services FAILED: $ENABLED_SERVICES"
+fi
+
+echo "Testing disable_negated_services()"
+
+
+function test_disable_negated_services {
+    local start="$1"
+    local finish="$2"
+
+    ENABLED_SERVICES="$start"
+    disable_negated_services
+    if [ "$ENABLED_SERVICES" = "$finish" ]; then
+        echo "OK: $start + $add -> $ENABLED_SERVICES"
+    else
+        echo "changing $start to $finish failed: $ENABLED_SERVICES"
+    fi
+}
+
+test_disable_negated_services '-a' ''
+test_disable_negated_services '-a,a' ''
+test_disable_negated_services '-a,-a' ''
+test_disable_negated_services 'a,-a' ''
+test_disable_negated_services 'b,a,-a' 'b'
+test_disable_negated_services 'a,b,-a' 'b'
+test_disable_negated_services 'a,-a,b' 'b'
+
+
+echo "Testing is_package_installed()"
+
+if [[ -z "$os_PACKAGE" ]]; then
+    GetOSVersion
+fi
+
+if [[ "$os_PACKAGE" = "deb" ]]; then
+    is_package_installed dpkg
+    VAL=$?
+elif [[ "$os_PACKAGE" = "rpm" ]]; then
+    is_package_installed rpm
+    VAL=$?
+else
+    VAL=1
+fi
+if [[ "$VAL" -eq 0 ]]; then
+    echo "OK"
+else
+    echo "is_package_installed() on existing package failed"
+fi
+
+if [[ "$os_PACKAGE" = "deb" ]]; then
+    is_package_installed dpkg bash
+    VAL=$?
+elif [[ "$os_PACKAGE" = "rpm" ]]; then
+    is_package_installed rpm bash
+    VAL=$?
+else
+    VAL=1
+fi
+if [[ "$VAL" -eq 0 ]]; then
+    echo "OK"
+else
+    echo "is_package_installed() on more than one existing package failed"
+fi
+
+is_package_installed zzzZZZzzz
+VAL=$?
+if [[ "$VAL" -ne 0 ]]; then
+    echo "OK"
+else
+    echo "is_package_installed() on non-existing package failed"
+fi
+
+# test against removed package...was a bug on Ubuntu
+if is_ubuntu; then
+    PKG=cowsay
+    if ! (dpkg -s $PKG >/dev/null 2>&1); then
+        # it was never installed...set up the condition
+        sudo apt-get install -y cowsay >/dev/null 2>&1
+    fi
+    if (dpkg -s $PKG >/dev/null 2>&1); then
+        # remove it to create the 'un' status
+        sudo dpkg -P $PKG >/dev/null 2>&1
+    fi
+
+    # now test the installed check on a deleted package
+    is_package_installed $PKG
+    VAL=$?
+    if [[ "$VAL" -ne 0 ]]; then
+        echo "OK"
+    else
+        echo "is_package_installed() on deleted package failed"
+    fi
+fi
+
+# test isset function
+echo  "Testing isset()"
+you_should_not_have_this_variable=42
+
+if isset "you_should_not_have_this_variable"; then
+    echo "OK"
+else
+    echo "\"you_should_not_have_this_variable\" not declared. failed"
+fi
+
+unset you_should_not_have_this_variable
+if isset "you_should_not_have_this_variable"; then
+    echo "\"you_should_not_have_this_variable\" looks like declared variable. failed"
+else
+    echo "OK"
+fi