internal/lsp: change the hover test to use normal editor methods

It was directly generating messages and sending them on the conn, now it
just uses an editor method like all the other tests.
It was also broken because it never opened the file it was hovering in, so I am
not sure it was testing anything useful before.

Change-Id: I7a1b444015c95c82a0a137d3bb1da661ed9331af
Reviewed-on: https://go-review.googlesource.com/c/tools/+/232983
Run-TryBot: Ian Cottrell <iancottrell@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Findley <rfindley@google.com>

internal/lsp/fake/editor.go

@@ -721,3 +721,22 @@ func (e *Editor) CodeAction(ctx context.Context, path string) ([]protocol.CodeAc
 	}
 	return lens, nil
 }
+
+// Hover triggers a hover at the given position in an open buffer.
+func (e *Editor) Hover(ctx context.Context, path string, pos Pos) (*protocol.MarkupContent, Pos, error) {
+	if err := e.checkBufferPosition(path, pos); err != nil {
+		return nil, Pos{}, err
+	}
+	params := &protocol.HoverParams{}
+	params.TextDocument.URI = e.sandbox.Workdir.URI(path)
+	params.Position = pos.toProtocolPosition()
+
+	resp, err := e.Server.Hover(ctx, params)
+	if err != nil {
+		return nil, Pos{}, fmt.Errorf("hover: %w", err)
+	}
+	if resp == nil {
+		return nil, Pos{}, nil
+	}
+	return &resp.Contents, fromProtocolPosition(resp.Range.Start), nil
+}

internal/lsp/regtest/env.go

@@ -12,7 +12,6 @@ import (
 	"sync"
 	"testing"
 
-	"golang.org/x/tools/internal/jsonrpc2"
 	"golang.org/x/tools/internal/jsonrpc2/servertest"
 	"golang.org/x/tools/internal/lsp/fake"
 	"golang.org/x/tools/internal/lsp/protocol"
@@ -31,7 +30,6 @@ type Env struct {
 	Sandbox *fake.Sandbox
 	Editor  *fake.Editor
 	Server  servertest.Connector
-	Conn    jsonrpc2.Conn
 
 	// mu guards the fields below, for the purpose of checking conditions on
 	// every change to diagnostics.
@@ -114,7 +112,6 @@ func NewEnv(ctx context.Context, t *testing.T, scratch *fake.Sandbox, ts servert
 		Ctx:     ctx,
 		Sandbox: scratch,
 		Server:  ts,
-		Conn:    conn,
 		state: State{
 			diagnostics:     make(map[string]*protocol.PublishDiagnosticsParams),
 			outstandingWork: make(map[string]*workProgress),

internal/lsp/regtest/serialization_test.go

@@ -5,10 +5,9 @@
 package regtest
 
 import (
-	"encoding/json"
 	"testing"
 
-	"golang.org/x/tools/internal/lsp/protocol"
+	"golang.org/x/tools/internal/lsp/fake"
 )
 
 const simpleProgram = `
@@ -28,16 +27,10 @@ func main() {
 func TestHoverSerialization(t *testing.T) {
 	runner.Run(t, simpleProgram, func(t *testing.T, env *Env) {
 		// Hover on an empty line.
-		params := protocol.HoverParams{}
-		params.TextDocument.URI = env.Sandbox.Workdir.URI("main.go")
-		params.Position.Line = 3
-		params.Position.Character = 0
-		var resp json.RawMessage
-		if err := protocol.Call(env.Ctx, env.Conn, "textDocument/hover", &params, &resp); err != nil {
-			t.Fatal(err)
-		}
-		if len(string(resp)) > 0 {
-			t.Errorf("got non-empty response for empty hover: %v", string(resp))
+		env.OpenFile("main.go")
+		content, pos := env.Hover("main.go", fake.Pos{Line: 3, Column: 0})
+		if content != nil {
+			t.Errorf("got non-empty response for empty hover: %v: %v", pos, *content)
 		}
 	})
 }

internal/lsp/regtest/wrappers.go

@@ -145,6 +145,16 @@ func (e *Env) ApplyQuickFixes(path string, diagnostics []protocol.Diagnostic) {
 	}
 }
 
+// Hover in the editor, calling t.Fatal on any error.
+func (e *Env) Hover(name string, pos fake.Pos) (*protocol.MarkupContent, fake.Pos) {
+	e.T.Helper()
+	c, p, err := e.Editor.Hover(e.Ctx, name, pos)
+	if err != nil {
+		e.T.Fatal(err)
+	}
+	return c, p
+}
+
 func checkIsFatal(t *testing.T, err error) {
 	t.Helper()
 	if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, io.ErrClosedPipe) {