Covered enter's ability to enter files other than filesystems.

tests/command_enter_test.rs

@@ -4,6 +4,43 @@ use h::{in_directory as cwd, Playground, Stub::*};
 use helpers as h;
 use std::path::{Path, PathBuf};
 
+#[test]
+fn can_understand_known_formats() {
+     let sandbox = Playground::setup_for("enter_can_understand_known_formats_test").with_files(vec![
+        FileWithContent(
+            "fortune_tellers.toml",
+            r#"
+                [[amigos]]
+                name = "Jonathan Turner"
+                unicorns = 1000
+
+                [[amigos]]
+                name = "Yehuda Katz"
+                unicorns = 1000
+
+                [[amigos]]
+                name = "Andrés N. Robalino"
+                unicorns = 1000
+            "#,
+        ),
+    ]).test_dir_name();
+
+    let full_path = format!("{}/{}", Playground::root(), sandbox);
+
+    nu!(
+        output,
+        cwd(&full_path),
+        r#"
+            enter fortune_tellers.toml
+            cd amigos
+            ls | get unicorns | sum
+            exit
+        "#
+    );
+
+    assert!(output.contains("3000"));
+}
+
 #[test]
 fn knows_the_filesystems_entered() {
     let sandbox = Playground::setup_for("enter_filesystem_sessions_test")