feat(runtime/os): add `Deno.env.has()` (#17315)

1 files changed, 7 insertions, 0 deletions

diff --git a/cli/tests/unit/os_test.ts b/cli/tests/unit/os_test.ts
index 81f912bcc..667c3cc81 100644
--- a/cli/tests/unit/os_test.ts
+++ b/cli/tests/unit/os_test.ts
@@ -26,6 +26,13 @@ Deno.test({ permissions: { env: true } }, function deleteEnv() {
   assertEquals(Deno.env.get("TEST_VAR"), undefined);
 });
 
+Deno.test({ permissions: { env: true } }, function hasEnv() {
+  Deno.env.set("TEST_VAR", "A");
+  assert(Deno.env.has("TEST_VAR"));
+  Deno.env.delete("TEST_VAR");
+  assert(!Deno.env.has("TEST_VAR"));
+});
+
 Deno.test({ permissions: { env: true } }, function avoidEmptyNamedEnv() {
   assertThrows(() => Deno.env.set("", "v"), TypeError);
   assertThrows(() => Deno.env.set("a=a", "v"), TypeError);