diff --git a/internal/provider/contains_function_test.go b/internal/provider/contains_function_test.go
index 329e540..987e69d 100644
--- a/internal/provider/contains_function_test.go
+++ b/internal/provider/contains_function_test.go
@@ -231,6 +231,16 @@ output "test" {
 				Config: `
 output "test" {
   value = provider::assert::contains([1, 2, 3], 45)
+}
+				`,
+				Check: resource.ComposeAggregateTestCheckFunc(
+					resource.TestCheckOutput("test", "false"),
+				),
+			},
+			{
+				Config: `
+output "test" {
+  value = provider::assert::contains([true, true], false)
 }
 				`,
 				Check: resource.ComposeAggregateTestCheckFunc(