Command tests (#922)

* WIP command tests

* Finish marking todo tests

* update

* update

* Windows cd test ignoring

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

@@ -0,0 +1,80 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn into_filesize_int() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        1 | into filesize
+        "#
+    ));
+
+    assert!(actual.out.contains("1 B"));
+}
+
+#[test]
+fn into_filesize_decimal() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        1.2 | into filesize
+        "#
+    ));
+
+    assert!(actual.out.contains("1 B"));
+}
+
+#[test]
+fn into_filesize_str() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        '2000' | into filesize
+        "#
+    ));
+
+    assert!(actual.out.contains("2.0 KiB"));
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn into_filesize_str_newline() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        "2000
+" | into filesize
+        "#
+    ));
+
+    assert!(actual.out.contains("2.0 KiB"));
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn into_filesize_str_many_newlines() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        "2000
+
+" | into filesize
+        "#
+    ));
+
+    assert!(actual.out.contains("2.0 KiB"));
+}
+
+#[test]
+fn into_filesize_filesize() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        3kib | into filesize
+        "#
+    ));
+
+    assert!(actual.out.contains("3.0 KiB"));
+}