chore(aws): fix unintended test failure of `aws::missing_any_credenti…

…als` (starship#4805)

chore(aws): fix unintended test failure of `aws::missing_any_credentials` 

Because its mocking is not enough, The test may unintentionally fail
if `~/.aws/credentials` exists.
This commit fixes this issue by mocking `credentials` file as well.

src/modules/aws.rs

@@ -802,10 +802,14 @@ aws_secret_access_key=dummy
     #[test]
     fn missing_any_credentials() -> io::Result<()> {
         let dir = tempfile::tempdir()?;
+
+        let credential_path = dir.path().join("credentials");
+        File::create(&credential_path)?;
+
         let config_path = dir.path().join("config");
-        let mut file = File::create(&config_path)?;
+        let mut config_file = File::create(&config_path)?;
 
-        file.write_all(
+        config_file.write_all(
             "[default]
 region = us-east-1
 output = json
@@ -818,6 +822,10 @@ region = us-east-2
 
         let actual = ModuleRenderer::new("aws")
             .env("AWS_CONFIG_FILE", config_path.to_string_lossy().as_ref())
+            .env(
+                "AWS_CREDENTIALS_FILE",
+                credential_path.to_string_lossy().as_ref(),
+            )
             .collect();
         let expected = None;