Command tests (#922)

* WIP command tests

* Finish marking todo tests

* update

* update

* Windows cd test ignoring

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

@@ -0,0 +1,160 @@
+use nu_test_support::{nu, pipeline};
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn by_column() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml --raw
+            | lines
+            | skip 1
+            | first 4
+            | split column "="
+            | sort-by Column1
+            | skip 1
+            | first 1
+            | get Column1
+            | str trim
+        "#
+    ));
+
+    assert_eq!(actual.out, "description");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn by_invalid_column() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml --raw
+            | lines
+            | skip 1
+            | first 4
+            | split column "="
+            | sort-by ColumnThatDoesNotExist
+            | skip 1
+            | first 1
+            | get Column1
+            | str trim
+        "#
+    ));
+
+    assert!(actual.err.contains("Can not find column to sort by"));
+    assert!(actual.err.contains("invalid column"));
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn by_invalid_types() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml --raw
+            | echo [1 "foo"]
+            | sort-by
+        "#
+    ));
+
+    assert!(actual.err.contains("Not all values can be compared"));
+    assert!(actual
+        .err
+        .contains("Unable to sort values, as \"integer\" cannot compare against \"string\""));
+}
+
+#[test]
+fn sort_primitive_values() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml --raw
+            | lines
+            | skip 1
+            | first 6
+            | sort-by
+            | first 1
+        "#
+    ));
+
+    assert_eq!(actual.out, "authors = [\"The Nu Project Contributors\"]");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn ls_sort_by_name_sensitive() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample-ls-output.json
+            | sort-by name
+            | select name
+            | to json --raw
+        "#
+    ));
+
+    let json_output = r#"[{"name":"B.txt"},{"name":"C"},{"name":"a.txt"}]"#;
+
+    assert_eq!(actual.out, json_output);
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn ls_sort_by_name_insensitive() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample-ls-output.json
+            | sort-by -i name
+            | select name
+            | to json --raw
+        "#
+    ));
+
+    let json_output = r#"[{"name":"a.txt"},{"name":"B.txt"},{"name":"C"}]"#;
+
+    assert_eq!(actual.out, json_output);
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn ls_sort_by_type_name_sensitive() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample-ls-output.json
+            | sort-by type name
+            | select name type
+            | to json --raw
+        "#
+    ));
+
+    let json_output = r#"[{"name":"C","type":"Dir"},{"name":"B.txt","type":"File"},{"name":"a.txt","type":"File"}]"#;
+
+    assert_eq!(actual.out, json_output);
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn ls_sort_by_type_name_insensitive() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open sample-ls-output.json
+            | sort-by -i type name
+            | select name type
+            | to json --raw
+        "#
+    ));
+
+    let json_output = r#"[{"name":"C","type":"Dir"},{"name":"a.txt","type":"File"},{"name":"B.txt","type":"File"}]"#;
+
+    assert_eq!(actual.out, json_output);
+}