diff --git a/test/sandbox/assert.go b/test/sandbox/assert.go
index c7d3ca4..ab1ff41 100644
--- a/test/sandbox/assert.go
+++ b/test/sandbox/assert.go
@@ -50,13 +50,14 @@ func (t *T) MustCheck(want *TestCase) {
 	}
 
 	if want.Mount != nil {
+		var fail bool
 		m := mustParseMountinfo(t.MountsPath)
 		i := 0
 		for ent := range m.Entries() {
 			if i == len(want.Mount) {
 				fatalf("got more than %d entries", i)
 			}
-			if !ent.EqualWithIgnore(want.Mount[i], "//ignore") {
+			if fail = !ent.EqualWithIgnore(want.Mount[i], "//ignore"); fail {
 				printf("[FAIL] %s", ent)
 			} else {
 				printf("[ OK ] %s", ent)
@@ -67,6 +68,10 @@ func (t *T) MustCheck(want *TestCase) {
 		if err := m.Err(); err != nil {
 			fatalf("%v", err)
 		}
+
+		if fail {
+			fatalf("[FAIL] some mount points did not match")
+		}
 	} else {
 		printf("[SKIP] skipping mounts check")
 	}