Some improvement, but two unit tests fail.

unit-tests/complex-list.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected='(1 2 3 ("Fred") nil 77354)'
-actual=`echo '(1 2 3 ("Fred") () 77354)' | target/psse 2> /dev/null`
+actual=`echo '(1 2 3 ("Fred") () 77354)' | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/empty-list.sh.bash

@@ -0,0 +1,19 @@
+#!/bin/bash
+# 
+# File:   empty-list.sh.bash
+# Author: simon
+#
+# Created on 14-Aug-2017, 15:06:40
+#
+
+expected=nil
+actual=`echo '()' | target/psse 2> /dev/null | head -1`
+
+if [ "${expected}" = "${actual}" ]
+then
+    echo "OK"
+    exit 0
+else
+    echo "Fail: expected '${expected}', got '${actual}'"
+    exit 1
+fi

unit-tests/empty-string.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected="\"\""
-actual=`echo '""' | target/psse 2> /dev/null`
+actual=`echo '""' | target/psse 2> /dev/null | head -1`
 
 if [ "$expected" = "$actual" ]
 then

unit-tests/fred.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected='"Fred"'
-actual=`echo ${expected} | target/psse 2> /dev/null`
+actual=`echo ${expected} | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/integer.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected="354"
-actual=`echo ${expected} | target/psse 2> /dev/null`
+actual=`echo ${expected} | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/nil.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected=nil
-actual=`echo '()' | target/psse 2> /dev/null`
+actual=`echo 'nil' | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/quote.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected='(quote Fred)'
-actual=`echo "'Fred" | target/psse 2> /dev/null`
+actual=`echo "'Fred" | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/quoted-list.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected='(quote (123 (4 (5 nil)) Fred))'
-actual=`echo "'(123 (4 (5 ())) Fred)" | target/psse 2> /dev/null`
+actual=`echo "'(123 (4 (5 ())) Fred)" | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/simple-list.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected="(1 2 3)"
-actual=`echo '(1 2 3)' | target/psse 2> /dev/null`
+actual=`echo '(1 2 3)' | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then

unit-tests/string-with-spaces.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 expected='"Strings should be able to include spaces (and other stuff)!"'
-actual=`echo ${expected} | target/psse 2> /dev/null`
+actual=`echo ${expected} | target/psse 2> /dev/null | head -1`
 
 if [ "${expected}" = "${actual}" ]
 then