diff --git a/src/dbtools/test/msi.plt b/src/dbtools/test/msi.plt
index 7671e903d..f15a0b90c 100644
--- a/src/dbtools/test/msi.plt
+++ b/src/dbtools/test/msi.plt
@@ -13,15 +13,21 @@ use FindBin qw($Bin);   # To find the msi executable
 use strict;
 use Test;
 
-BEGIN {plan tests => 6}
+BEGIN {plan tests => 7}
 
-ok(msi('-I.. ../t1-template.txt'),          slurp('../t1-result.txt'));
-ok(msi('-I.. -S ../t2-substitution.txt'),   slurp('../t2-result.txt'));
-ok(msi('-I.. -S ../t3-substitution.txt'),   slurp('../t3-result.txt'));
-ok(msi('-g -I.. -S ../t4-substitution.txt'),slurp('../t4-result.txt'));
+ok(msi('-I .. ../t1-template.txt'),             slurp('../t1-result.txt'));
+ok(msi('-I.. -S ../t2-substitution.txt'),       slurp('../t2-result.txt'));
+ok(msi('-I. -I.. -S ../t3-substitution.txt'),   slurp('../t3-result.txt'));
+ok(msi('-g -I.. -S ../t4-substitution.txt'),    slurp('../t4-result.txt'));
 ok(msi('-S ../t5-substitute.txt ../t5-template.txt'), slurp('../t5-result.txt'));
 ok(msi('-S ../t6-substitute.txt ../t6-template.txt'), slurp('../t6-result.txt'));
 
+# Check -o works
+my $out = 't7-output.txt';
+unlink $out;
+msi("-I.. -o $out ../t1-template.txt");
+ok(slurp($out), slurp('../t1-result.txt'));
+
 
 # Support routines