Command tests (#922)

* WIP command tests

* Finish marking todo tests

* update

* update

* Windows cd test ignoring

crates/nu-command/tests/commands/path/basename.rs

@@ -0,0 +1,83 @@
+use nu_test_support::{nu, pipeline};
+
+use super::join_path_sep;
+
+#[test]
+fn returns_basename_of_empty_input() {
+    let actual = nu!(
+        cwd: "tests", pipeline(
+        r#"
+            echo "" 
+            | path basename
+        "#
+    ));
+
+    assert_eq!(actual.out, "");
+}
+
+#[test]
+fn replaces_basename_of_empty_input() {
+    let actual = nu!(
+        cwd: "tests", pipeline(
+        r#"
+            echo "" 
+            | path basename -r newname.txt
+        "#
+    ));
+
+    assert_eq!(actual.out, "newname.txt");
+}
+
+#[test]
+fn returns_basename_of_path_ending_with_dot() {
+    let actual = nu!(
+        cwd: "tests", pipeline(
+        r#"
+            echo "some/file.txt/." 
+            | path basename 
+        "#
+    ));
+
+    assert_eq!(actual.out, "file.txt");
+}
+
+#[test]
+fn replaces_basename_of_path_ending_with_dot() {
+    let actual = nu!(
+        cwd: "tests", pipeline(
+        r#"
+            echo "some/file.txt/." 
+            | path basename -r viking.txt
+        "#
+    ));
+
+    let expected = join_path_sep(&["some", "viking.txt"]);
+    assert_eq!(actual.out, expected);
+}
+
+#[test]
+fn returns_basename_of_path_ending_with_double_dot() {
+    let actual = nu!(
+        cwd: "tests", pipeline(
+        r#"
+            echo "some/file.txt/.." 
+            | path basename 
+        "#
+    ));
+
+    assert_eq!(actual.out, "");
+}
+
+#[test]
+fn replaces_basename_of_path_ending_with_double_dot() {
+    let actual = nu!(
+        cwd: "tests", pipeline(
+        r#"
+            echo "some/file.txt/.." 
+            | path basename -r eggs
+        "#
+    ));
+
+    let expected = join_path_sep(&["some/file.txt/..", "eggs"]);
+    assert_eq!(actual.out, expected);
+}