Refactor openssl command arguments into a separate function and add a test for it

src/main.rs

@@ -803,17 +803,7 @@ fn openssl_https_get_text(url: &str) -> Result<String> {
     let bootstrap_ca_path = write_bootstrap_ca_tempfile()?;
     let result = (|| {
         let mut cmd = Command::new("openssl");
-        cmd.args([
-            "s_client",
-            "-quiet",
-            "-verify_return_error",
-            "-verifyCAfile",
-            bootstrap_ca_path.to_str().unwrap_or(""),
-            "-connect",
-            &format!("{host}:{port}"),
-            "-servername",
-            host,
-        ]);
+        cmd.args(openssl_s_client_args(&bootstrap_ca_path, host, port));
         if Path::new(DEFAULT_SSL_CERTS_DIR).is_dir() {
             cmd.args(["-verifyCApath", DEFAULT_SSL_CERTS_DIR]);
         }
@@ -851,6 +841,20 @@ fn openssl_https_get_text(url: &str) -> Result<String> {
     result
 }
 
+fn openssl_s_client_args(bootstrap_ca_path: &Path, host: &str, port: u16) -> Vec<String> {
+    vec![
+        "s_client".to_string(),
+        "-quiet".to_string(),
+        "-verify_return_error".to_string(),
+        "-CAfile".to_string(),
+        bootstrap_ca_path.display().to_string(),
+        "-connect".to_string(),
+        format!("{host}:{port}"),
+        "-servername".to_string(),
+        host.to_string(),
+    ]
+}
+
 fn write_bootstrap_ca_tempfile() -> Result<PathBuf> {
     let nonce = SystemTime::now()
         .duration_since(UNIX_EPOCH)
@@ -2358,6 +2362,13 @@ CKA_TRUST_SERVER_AUTH CK_TRUST CKT_NSS_TRUSTED_DELEGATOR
         assert!(out.contains("BEGINDATA"));
     }
 
+    #[test]
+    fn openssl_s_client_args_use_portable_ca_file_flag() {
+        let args = openssl_s_client_args(Path::new("/tmp/bootstrap-ca.pem"), "hg.mozilla.org", 443);
+        assert!(args.contains(&"-CAfile".to_string()));
+        assert!(!args.contains(&"-verifyCAfile".to_string()));
+    }
+
     #[test]
     fn decode_certdata_octal_multiline_decodes_bytes() {
         let lines = vec![r"\101\102".to_string(), r"\103".to_string()];