Command tests (#922)

* WIP command tests

* Finish marking todo tests

* update

* update

* Windows cd test ignoring

crates/nu-command/tests/commands/into_int.rs

@@ -0,0 +1,37 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn into_int_filesize() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo 1kb | into int | each { $it / 1000 }
+        "#
+    ));
+
+    assert!(actual.out.contains('1'));
+}
+
+#[test]
+fn into_int_filesize2() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo 1kib | into int | each { $it / 1024 }
+        "#
+    ));
+
+    assert!(actual.out.contains('1'));
+}
+
+#[test]
+fn into_int_int() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo 1024 | into int | each { $it / 1024 }
+        "#
+    ));
+
+    assert!(actual.out.contains('1'));
+}