ts: improve coverage of getCmpSpecFromVersSpec proc

Signed-off-by: Xavier Delaruelle <xavier.delaruelle@cea.fr>

testsuite/example/siteconfig.tcl-1

@@ -690,4 +690,8 @@ if {[info exists env(TESTSUITE_ENABLE_SITECONFIG_GETHELPLINES)]} {
     report [string length [getModuleHelpLines]]
 }
 
+if {[info exists env(TESTSUITE_ENABLE_SITECONFIG_GETCMPSPECFROMVERSSPEC)]} {
+    report [getCmpSpecFromVersSpec unk]
+}
+
 }

testsuite/modules.00-init/120-siteconfig.exp

@@ -762,6 +762,13 @@ lappend ans $vers_reportre
 testouterr_cmd_re sh -V OK [join $ans \n]
 unsetenv_var TESTSUITE_ENABLE_SITECONFIG_GETHELPLINES
 
+setenv_var TESTSUITE_ENABLE_SITECONFIG_GETCMPSPECFROMVERSSPEC 1
+set ans [list]
+lappend ans eq
+lappend ans $vers_reportre
+testouterr_cmd_re sh -V OK [join $ans \n]
+unsetenv_var TESTSUITE_ENABLE_SITECONFIG_GETCMPSPECFROMVERSSPEC
+
 } elseif {$verbose} {
     send_user "\tSkip tests relying on an excepted siteconfig file installed\n"
 }