support env_logger / RUST_LOG (#7142)

1 files changed, 30 insertions, 0 deletions

diff --git a/cli/tests/integration_tests.rs b/cli/tests/integration_tests.rs
index b8be7262d..08c68a9ae 100644
--- a/cli/tests/integration_tests.rs
+++ b/cli/tests/integration_tests.rs
@@ -3349,3 +3349,33 @@ fn should_not_panic_on_undefined_deno_dir_and_home_environment_variables() {
     .unwrap();
   assert!(output.status.success());
 }
+
+#[test]
+fn rust_log() {
+  // Without RUST_LOG the stderr is empty.
+  let output = util::deno_cmd()
+    .current_dir(util::root_path())
+    .arg("run")
+    .arg("cli/tests/001_hello.js")
+    .stderr(std::process::Stdio::piped())
+    .spawn()
+    .unwrap()
+    .wait_with_output()
+    .unwrap();
+  assert!(output.status.success());
+  assert!(output.stderr.is_empty());
+
+  // With RUST_LOG the stderr is not empty.
+  let output = util::deno_cmd()
+    .current_dir(util::root_path())
+    .arg("run")
+    .arg("cli/tests/001_hello.js")
+    .env("RUST_LOG", "debug")
+    .stderr(std::process::Stdio::piped())
+    .spawn()
+    .unwrap()
+    .wait_with_output()
+    .unwrap();
+  assert!(output.status.success());
+  assert!(!output.stderr.is_empty());
+}