tests: migrate derivation-json.sh

Change-Id: I8a648231677bde28611dc9511e3a03d87608e7b4

tests/functional2/cli/test_derivation.py

@@ -0,0 +1,32 @@
+import json
+from testlib.utils import get_global_asset_pack
+from testlib.fixtures.file_helper import with_files
+from testlib.fixtures.nix import Nix
+
+
+@with_files(get_global_asset_pack("simple-drv"))
+def test_add_json(nix: Nix):
+    drv_path = nix.nix_instantiate(["simple.nix"]).run().ok().stdout_plain
+
+    drv_json = nix.nix(["derivation", "show", drv_path], flake=True).run().json()
+    drv_json = next(iter(drv_json.values()))
+
+    drv_path2 = (
+        nix.nix(["derivation", "add"], flake=True)
+        .with_stdin(json.dumps(drv_json).encode())
+        .run()
+        .ok()
+        .stdout_plain
+    )
+
+    assert drv_path == drv_path2
+    drv_json["name"] = "foo"
+
+    res = (
+        nix.nix(["derivation", "add"], flake=True)
+        .with_stdin(json.dumps(drv_json).encode())
+        .run()
+        .expect(1)
+    )
+
+    assert "has incorrect output" in res.stderr_plain