Command tests (#922)

* WIP command tests

* Finish marking todo tests

* update

* update

* Windows cd test ignoring

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

@@ -0,0 +1,138 @@
+use nu_test_support::{nu, pipeline};
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn reduce_table_column() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo "[{month:2,total:30}, {month:3,total:10}, {month:4,total:3}, {month:5,total:60}]"
+        | from json
+        | get total
+        | reduce -f 20 { $it.item + (math eval $"($item.acc)^1.05")}
+        | into string -d 1
+        "#
+        )
+    );
+
+    assert_eq!(actual.out, "180.6");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn reduce_table_column_with_path() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        [{month:2,total:30}, {month:3,total:10}, {month:4,total:3}, {month:5,total:60}]
+        | reduce -f 20 { $it.item.total + (math eval $"($item.acc)^1.05")}
+        | into string -d 1
+        "#
+        )
+    );
+
+    assert_eq!(actual.out, "180.6");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn reduce_rows_example() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        [[a,b]; [1,2] [3,4]]
+        | reduce -f 1.6 { $it.acc * ($it.item.a | into int) + ($it.item.b | into int) }
+        "#
+        )
+    );
+
+    assert_eq!(actual.out, "14.8");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn reduce_numbered_example() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo one longest three bar
+        | reduce -n { if ($it.item.item | str length) > ($it.acc.item | str length) {echo $it.item} else {echo $it.acc}}
+        | get index
+        "#
+        )
+    );
+
+    assert_eq!(actual.out, "1");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn reduce_numbered_integer_addition_example() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo [1 2 3 4]
+        | reduce -n { $it.acc.item + $it.item.item }
+        | get item
+        "#
+        )
+    );
+
+    assert_eq!(actual.out, "10");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn folding_with_tables() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo [10 20 30 40]
+        | reduce -f [] {
+            with-env [value $it.item] {
+              echo $acc | append (10 * ($env.value | into int))
+            }
+          }
+        | math sum
+        "#
+        )
+    );
+
+    assert_eq!(actual.out, "1000");
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn error_reduce_fold_type_mismatch() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        echo a b c | reduce -f 0 { $it.acc + $it.item }
+        "#
+        )
+    );
+
+    assert!(actual.err.contains("mismatch"));
+}
+
+// FIXME: jt: needs more work
+#[ignore]
+#[test]
+fn error_reduce_empty() {
+    let actual = nu!(
+        cwd: ".", pipeline(
+        r#"
+        reduce { $it.$acc + $it.item }
+        "#
+        )
+    );
+
+    assert!(actual.err.contains("needs input"));
+}