Add insert and update back (#4864)

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

@@ -0,0 +1,60 @@
+use nu_test_support::{nu, pipeline};
+
+#[test]
+fn sets_the_column() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml
+            | upsert dev-dependencies.pretty_assertions "0.7.0"
+            | get dev-dependencies.pretty_assertions
+        "#
+    ));
+
+    assert_eq!(actual.out, "0.7.0");
+}
+
+#[cfg(features = "inc")]
+#[test]
+fn sets_the_column_from_a_block_run_output() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            open cargo_sample.toml
+            | upsert dev-dependencies.pretty_assertions { open cargo_sample.toml | get dev-dependencies.pretty_assertions | inc --minor }
+            | get dev-dependencies.pretty_assertions
+        "#
+    ));
+
+    assert_eq!(actual.out, "0.7.0");
+}
+
+#[test]
+fn sets_the_column_from_a_block_full_stream_output() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            wrap content
+            | upsert content { open --raw cargo_sample.toml | lines | first 5 }
+            | get content.1
+            | str contains "nu"
+        "#
+    ));
+
+    assert_eq!(actual.out, "true");
+}
+
+#[test]
+fn sets_the_column_from_a_subexpression() {
+    let actual = nu!(
+        cwd: "tests/fixtures/formats", pipeline(
+        r#"
+            wrap content
+            | upsert content (open --raw cargo_sample.toml | lines | first 5)
+            | get content.1
+            | str contains "nu"
+        "#
+    ));
+
+    assert_eq!(actual.out, "true");
+}