--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang-tools-extra/clangd/test/completion.test	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,72 @@
+# RUN: clangd -lit-test < %s | FileCheck -strict-whitespace %s
+# RUN: clangd -lit-test -pch-storage=memory < %s | FileCheck -strict-whitespace %s
+{"jsonrpc":"2.0","id":0,"method":"initialize","params":{"processId":123,"rootPath":"clangd","capabilities":{},"trace":"off"}}
+---
+{"jsonrpc":"2.0","method":"textDocument/didOpen","params":{"textDocument":{"uri":"test:///main.cpp","languageId":"cpp","version":1,"text":"struct S { int a; };\nint main() {\nS().\n}"}}}
+---
+{"jsonrpc":"2.0","id":1,"method":"textDocument/completion","params":{"textDocument":{"uri":"test:///main.cpp"},"position":{"line":2,"character":4}}}
+#      CHECK:  "id": 1
+# CHECK-NEXT:  "jsonrpc": "2.0",
+# CHECK-NEXT:  "result": {
+# CHECK-NEXT:    "isIncomplete": false,
+# CHECK-NEXT:    "items": [
+# CHECK-NEXT:    {
+# CHECK-NEXT:      "detail": "int",
+# CHECK-NEXT:      "filterText": "a",
+# CHECK-NEXT:      "insertText": "a",
+# CHECK-NEXT:      "insertTextFormat": 1,
+# CHECK-NEXT:      "kind": 5,
+# CHECK-NEXT:      "label": " a",
+# CHECK-NEXT:      "sortText": "{{.*}}a"
+# CHECK-NEXT:      "textEdit": {
+# CHECK-NEXT:        "newText": "a",
+# CHECK-NEXT:        "range": {
+# CHECK-NEXT:          "end": {
+# CHECK-NEXT:            "character": 4,
+# CHECK-NEXT:            "line": 2
+# CHECK-NEXT:          }
+# CHECK-NEXT:          "start": {
+# CHECK-NEXT:            "character": 4,
+# CHECK-NEXT:            "line": 2
+# CHECK-NEXT:          }
+# CHECK-NEXT:        }
+# CHECK-NEXT:      }
+# CHECK-NEXT:    }
+# CHECK-NEXT:  ]
+---
+# Update the source file and check for completions again.
+{"jsonrpc":"2.0","method":"textDocument/didChange","params":{"textDocument":{"uri":"test:///main.cpp","version":2},"contentChanges":[{"text":"struct S { int b; };\nint main() {\nS().\n}"}]}}
+---
+{"jsonrpc":"2.0","id":3,"method":"textDocument/completion","params":{"textDocument":{"uri":"test:///main.cpp"},"position":{"line":2,"character":4}}}
+#      CHECK:  "id": 3,
+# CHECK-NEXT:  "jsonrpc": "2.0",
+# CHECK-NEXT:  "result": {
+# CHECK-NEXT:    "isIncomplete": false,
+# CHECK-NEXT:    "items": [
+# CHECK-NEXT:    {
+# CHECK-NEXT:      "detail": "int",
+# CHECK-NEXT:      "filterText": "b",
+# CHECK-NEXT:      "insertText": "b",
+# CHECK-NEXT:      "insertTextFormat": 1,
+# CHECK-NEXT:      "kind": 5,
+# CHECK-NEXT:      "label": " b",
+# CHECK-NEXT:      "sortText": "{{.*}}b"
+# CHECK-NEXT:      "textEdit": {
+# CHECK-NEXT:        "newText": "b",
+# CHECK-NEXT:        "range": {
+# CHECK-NEXT:          "end": {
+# CHECK-NEXT:            "character": 4,
+# CHECK-NEXT:            "line": 2
+# CHECK-NEXT:          }
+# CHECK-NEXT:          "start": {
+# CHECK-NEXT:            "character": 4,
+# CHECK-NEXT:            "line": 2
+# CHECK-NEXT:          }
+# CHECK-NEXT:        }
+# CHECK-NEXT:      }
+# CHECK-NEXT:    }
+# CHECK-NEXT:  ]
+---
+{"jsonrpc":"2.0","id":4,"method":"shutdown"}
+---
+{"jsonrpc":"2.0","method":"exit"}