GNU uname aka. guname(1) -o, --operating-system is uname(1) -s.
Fix a few tests (probably shell quote/file handling messed up).
Remove bash-ism.

Index: tests/testrun.sh
--- tests/testrun.sh.orig
+++ tests/testrun.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-OS_ARCH=`uname -o`
+OS_ARCH=`uname -s`
 OS_KERNEL=`uname -s`
 
 #
@@ -704,7 +704,9 @@ execEncTest() {
                 cat $tmpfile | $outputTransform > $tmpfile.2
                 mv $tmpfile.2 $tmpfile
             fi
-            diff $diff_param $full_file.data $tmpfile >> $curlogfile 2>> $curlogfile
+	    # $outputTransform may be set to "base64" in which case identical
+	    # strings happen to differ, ignoring trailing spaces fixes that
+            diff -b $diff_param $full_file.data $tmpfile >> $curlogfile 2>> $curlogfile
             printRes $expected_res $?
         else
             printRes $expected_res $res
@@ -736,7 +738,9 @@ execEncTest() {
                 cat $tmpfile.2 | $outputTransform > $tmpfile
                 mv $tmpfile $tmpfile.2
             fi
-            diff $diff_param $full_file.data $tmpfile.2 >> $curlogfile 2>> $curlogfile
+	    # $outputTransform may be set to "base64" in which case identical
+	    # strings happen to differ, ignoring trailing spaces fixes that
+            diff -b $diff_param $full_file.data $tmpfile.2 >> $curlogfile 2>> $curlogfile
             printRes $res_success $?
         else
             printRes $res_success $res
@@ -761,7 +765,7 @@ execEncTest() {
 rm -rf $tmpfile $tmpfile.2 tmpfile.3
 
 # run tests
-source "$testfile"
+. "$testfile"
 
 # calculate success
 percent_success=0