Run 'cargo run' only once

tests/integration_tests.rs

@@ -1,10 +1,22 @@
 extern crate assert_cmd;
+extern crate escargot;
+#[macro_use]
+extern crate lazy_static;
 
 use assert_cmd::prelude::*;
+use escargot::CargoRun;
 use std::process::Command;
 
+lazy_static! {
+    static ref CARGO_RUN: CargoRun = escargot::CargoBuild::new()
+        .bin("bat")
+        .current_release()
+        .run()
+        .unwrap();
+}
+
 fn bat_with_config() -> Command {
-    let mut cmd = Command::main_binary().unwrap();
+    let mut cmd = CARGO_RUN.command();
     cmd.current_dir("tests/examples");
     cmd.env_remove("PAGER");
     cmd.env_remove("BAT_PAGER");