internal/lsp: add tests for cgo package users

We now have pretty good support for users of cgo packages. Add tests.

Closes golang/go#35720.

Change-Id: Icdc596038bc6fca1c08eacd199def12264cf512d
Reviewed-on: https://go-review.googlesource.com/c/tools/+/208503
Run-TryBot: Heschi Kreinick <[email protected]>
Reviewed-by: Rebecca Stambler <[email protected]>

Author: heschi

internal/lsp/testdata/cgo/declarecgo.go

@@ -0,0 +1,26 @@
+package cgo
+
+/*
+#include <stdio.h>
+#include <stdlib.h>
+
+void myprint(char* s) {
+	printf("%s\n", s);
+}
+*/
+import "C"
+
+import "fmt"
+
+import "unsafe"
+
+func Example() { //@mark(funccgoexample, "Example"),item(funccgoexample, "Example", "func()", "func")
+	fmt.Println()
+	cs := C.CString("Hello from stdio\n")
+	C.myprint(cs)
+	C.free(unsafe.Pointer(cs))
+}
+
+func _() {
+	Example()
+}

internal/lsp/testdata/cgoimport/usecgo.go.golden

@@ -0,0 +1,22 @@
+-- funccgoexample-definition --
+cgo/declarecgo.go:17:6-13: defined here as func cgo.Example()
+-- funccgoexample-definition-json --
+{
+	"span": {
+		"uri": "file://cgo/declarecgo.go",
+		"start": {
+			"line": 17,
+			"column": 6,
+			"offset": 153
+		},
+		"end": {
+			"line": 17,
+			"column": 13,
+			"offset": 160
+		}
+	},
+	"description": "func cgo.Example()"
+}
+
+-- funccgoexample-hover --
+func cgo.Example()

internal/lsp/testdata/cgoimport/usecgo.go.in

@@ -0,0 +1,9 @@
+package cgoimport
+
+import (
+	"golang.org/x/tools/internal/lsp/cgo"
+)
+
+func _() {
+	cgo.Example() //@godef("ample", funccgoexample),complete("ample", funccgoexample)
+}

internal/lsp/testdata/cgoimport/usegco.go.golden

@@ -0,0 +1,2 @@
+-- funcexample-hover --
+func cgo.Example()

internal/lsp/testdata/summary.txt.golden

@@ -1,5 +1,5 @@
 -- summary --
-CompletionsCount = 215
+CompletionsCount = 216
 CompletionSnippetCount = 51
 UnimportedCompletionsCount = 3
 DeepCompletionsCount = 5
@@ -11,7 +11,7 @@ FoldingRangesCount = 2
 FormatCount = 6
 ImportCount = 7
 SuggestedFixCount = 1
-DefinitionsCount = 37
+DefinitionsCount = 38
 TypeDefinitionsCount = 2
 HighlightsCount = 22
 ReferencesCount = 7