nixd/Controller: precommit test for #629 (#685)

Author: inclyc

nixd/tools/nixd/test/hover/package-select.md

@@ -0,0 +1,65 @@
+# RUN: nixd --lit-test \
+# RUN: --nixpkgs-expr="{ hello.meta.description = \"Very Nice\";  }" \
+# RUN: < %s | FileCheck %s
+
+<-- initialize(0)
+
+```json
+{
+   "jsonrpc":"2.0",
+   "id":0,
+   "method":"initialize",
+   "params":{
+      "processId":123,
+      "rootPath":"",
+      "capabilities":{
+      },
+      "trace":"off"
+   }
+}
+```
+
+
+<-- textDocument/didOpen
+
+
+```nix file:///test.nix
+pkgs.foo
+```
+
+<-- textDocument/hover(2)
+
+
+```json
+{
+   "jsonrpc":"2.0",
+   "id":2,
+   "method":"textDocument/hover",
+   "params":{
+      "textDocument":{
+         "uri":"file:///test.nix"
+      },
+      "position":{
+         "line":0,
+         "character":6
+      }
+   }
+}
+```
+
+```
+     CHECK:    "contents": {
+CHECK-NEXT:      "kind": "markdown",
+CHECK-NEXT:      "value": "`Identifier`"
+CHECK-NEXT:    },
+CHECK-NEXT:    "range": {
+CHECK-NEXT:      "end": {
+CHECK-NEXT:        "character": 8,
+CHECK-NEXT:        "line": 0
+CHECK-NEXT:      },
+CHECK-NEXT:      "start": {
+CHECK-NEXT:        "character": 5,
+CHECK-NEXT:        "line": 0
+CHECK-NEXT:      }
+CHECK-NEXT:    }
+```