Merge pull request #363 from twe4ked/cd-back

Implement `cd -` to return to the previous directory

tests/command_cd_tests.rs

@@ -1,5 +1,7 @@
 mod helpers;
 
+use helpers::Playground;
+
 #[test]
 fn cd_directory_not_found() {
     let actual = nu_error!(
@@ -10,3 +12,35 @@ fn cd_directory_not_found() {
     assert!(actual.contains("dir_that_does_not_exist"));
     assert!(actual.contains("directory not found"));
 }
+
+#[test]
+fn cd_back() {
+    Playground::setup("cd_test_back", |dirs, sandbox| {
+        sandbox
+            .mkdir("andres")
+            .mkdir("odin");
+
+        let odin = dirs.test().join("odin");
+        let andres = dirs.test().join("andres");
+
+        nu!(
+            cwd: dirs.test(),
+            r#"
+                cd odin
+                mkdir a
+                cd ../andres
+                mkdir b
+                cd -
+                mkdir c
+                mkdir -
+                cd -
+                mkdir d
+            "#
+        );
+
+        assert!(odin.join("a").exists());
+        assert!(andres.join("b").exists());
+        assert!(odin.join("c").exists());
+        assert!(odin.join("-").join("d").exists());
+    })
+}