Move execution order tests to separate file

tests/common.rs

@@ -0,0 +1,13 @@
+use std::process::Command;
+
+use assert_cmd::cargo::CommandCargoExt;
+
+pub fn hyperfine_raw_command() -> Command {
+    let mut cmd = Command::cargo_bin("hyperfine").unwrap();
+    cmd.current_dir("tests/");
+    cmd
+}
+
+pub fn hyperfine() -> assert_cmd::Command {
+    assert_cmd::Command::from_std(hyperfine_raw_command())
+}