feat: Add the ability to set current dir and env vars

tests/cmd.rs

@@ -11,6 +11,47 @@ fn expression() {
     assert_eq!(format!("{command:?}"), r#""echo" "test""#.to_string());
 }
 
+#[test]
+fn current_dir() {
+    let command = cmd!(
+        cd "~/";
+        "echo",
+        "test",
+    );
+
+    assert_eq!(format!("{command:?}"), r#"cd "~/" && "echo" "test""#);
+}
+
+#[test]
+fn env_vars() {
+    let command = cmd!(
+        env {
+            "TEST": "test",
+        };
+        "echo",
+        "test",
+    );
+
+    assert_eq!(format!("{command:?}"), r#"TEST="test" "echo" "test""#);
+}
+
+#[test]
+fn cd_env_vars() {
+    let command = cmd!(
+        cd "~/";
+        env {
+            "TEST": "test",
+        };
+        "echo",
+        "test",
+    );
+
+    assert_eq!(
+        format!("{command:?}"),
+        r#"cd "~/" && TEST="test" "echo" "test""#
+    );
+}
+
 #[rstest]
 #[case(false, false, r#""echo" "test""#)]
 #[case(true, false, r#""echo" "test" "single""#)]