diff --git a/t/t3800-mktag.sh b/t/t3800-mktag.sh
index c1008361a5..1cc382dc8b 100755
--- a/t/t3800-mktag.sh
+++ b/t/t3800-mktag.sh
@@ -14,7 +14,8 @@ test_description='git mktag: tag object verify test'
 check_verify_failure () {
 	expect="$2"
 	test_expect_success "$1" '
-		test_must_fail git mktag <tag.sig 2>message &&
+		test_must_fail env GIT_TEST_GETTEXT_POISON=false \
+			git mktag <tag.sig 2>message &&
 		grep "$expect" message
 	'
 }
@@ -136,7 +137,29 @@ check_verify_failure '"type" line type-name length check' \
 	'^error: char.*: type too long$'
 
 ############################################################
-#  9. verify object (SHA1/type) check
+#  9. verify object (hash/type) check
+
+cat >tag.sig <<EOF
+object $(test_oid deadbeef)
+type tag
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+check_verify_failure 'verify object (hash/type) check -- correct type, nonexisting object' \
+	'^error: char7: could not verify object.*$'
+
+cat >tag.sig <<EOF
+object $head
+type tagggg
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+check_verify_failure 'verify object (hash/type) check -- made-up type, valid object' \
+	'^fatal: invalid object type'
 
 cat >tag.sig <<EOF
 object $(test_oid deadbeef)
@@ -146,9 +169,20 @@ tagger . <> 0 +0000
 
 EOF
 
-check_verify_failure 'verify object (SHA1/type) check' \
+check_verify_failure 'verify object (hash/type) check -- made-up type, nonexisting object' \
 	'^error: char7: could not verify object.*$'
 
+cat >tag.sig <<EOF
+object $head
+type tree
+tag mytag
+tagger . <> 0 +0000
+
+EOF
+
+check_verify_failure 'verify object (hash/type) check -- mismatched type, valid object' \
+	'^error: char7: could not verify object'
+
 ############################################################
 # 10. verify tag-name check