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|
package gopls
import (
"bufio"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"strings"
"testing"
"time"
)
const fakeGoplsEnvVar = "TUI_TEST_FAKE_GOPLS"
func TestMain(m *testing.M) {
if os.Getenv(fakeGoplsEnvVar) == "1" {
fakeGoplsServe(os.Stdin, os.Stdout)
os.Exit(0)
}
os.Exit(m.Run())
}
func readFramed(r *bufio.Reader) ([]byte, error) {
contentLength := 0
for {
line, err := r.ReadString('\n')
if err != nil {
return nil, err
}
line = strings.TrimSpace(line)
if line == "" {
break
}
if after, ok := strings.CutPrefix(line, "Content-Length:"); ok {
if _, err := fmt.Sscanf(strings.TrimSpace(after), "%d", &contentLength); err != nil {
return nil, err
}
}
}
buf := make([]byte, contentLength)
if _, err := io.ReadFull(r, buf); err != nil {
return nil, err
}
return buf, nil
}
func writeFramed(w io.Writer, payload string) {
fmt.Fprintf(w, "Content-Length: %d\r\n\r\n%s", len(payload), payload)
}
func fakeGoplsServe(in io.Reader, out io.Writer) {
r := bufio.NewReader(in)
var seen []string
type docParams struct {
TextDocument struct {
URI string `json:"uri"`
} `json:"textDocument"`
Position Position `json:"position"`
}
for {
msg, err := readFramed(r)
if err != nil {
return
}
var req struct {
ID int64 `json:"id"`
Method string `json:"method"`
Params json.RawMessage `json:"params"`
}
if err := json.Unmarshal(msg, &req); err != nil {
continue
}
reply := func(result string) {
writeFramed(out, fmt.Sprintf(`{"jsonrpc":"2.0","id":%d,"result":%s}`, req.ID, result))
}
var doc docParams
_ = json.Unmarshal(req.Params, &doc)
uri := doc.TextDocument.URI
switch req.Method {
case "initialize":
reply(`{"capabilities":{"hoverProvider":true}}`)
case "initialized":
case "shutdown":
reply("null")
case "exit":
return
case "textDocument/didOpen", "textDocument/didChange", "textDocument/didClose":
seen = append(seen, req.Method+" "+string(req.Params))
case "test/seen":
data, _ := json.Marshal(seen)
reply(string(data))
case "test/error":
writeFramed(out, fmt.Sprintf(
`{"jsonrpc":"2.0","id":%d,"error":{"code":-32601,"message":"method not found"}}`, req.ID))
case "test/publishDiagnostics":
writeFramed(out, fmt.Sprintf(
`{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":%s}`, string(req.Params)))
case "test/sendBare":
writeFramed(out, `{"jsonrpc":"2.0","result":{}}`)
case "test/sendGarbage":
writeFramed(out, `{this is not json`)
case "textDocument/hover":
switch {
case strings.Contains(uri, "nullhover"):
reply("null")
case strings.Contains(uri, "badhover"):
reply(`[1,2]`)
default:
reply(fmt.Sprintf(`{"contents":{"kind":"markdown","value":"hover:%s:%d:%d"}}`,
uri, doc.Position.Line, doc.Position.Character))
}
case "textDocument/definition":
switch {
case strings.Contains(uri, "nulldef"):
reply("null")
case strings.Contains(uri, "singledef"):
reply(`{"uri":"file:///single.go","range":{"start":{"line":1,"character":2},"end":{"line":1,"character":7}}}`)
case strings.Contains(uri, "baddef"):
reply(`5`)
default:
reply(`[{"uri":"file:///def.go","range":{"start":{"line":3,"character":4},"end":{"line":3,"character":9}}}]`)
}
case "textDocument/completion":
switch {
case strings.Contains(uri, "arraycomp"):
reply(`[{"label":"ArrayItem","kind":6}]`)
case strings.Contains(uri, "badcomp"):
reply(`"oops"`)
default:
reply(`{"isIncomplete":false,"items":[{"label":"Println","kind":3,"detail":"func(a ...any) (n int, err error)"}]}`)
}
default:
if req.ID != 0 {
reply("null")
}
}
}
}
func startFakeGopls(t *testing.T) *GoplsProxy {
t.Helper()
exe, err := os.Executable()
if err != nil {
t.Fatalf("os.Executable: %v", err)
}
name := "gopls"
if runtime.GOOS == "windows" {
name = "gopls.exe"
}
dir := t.TempDir()
target := filepath.Join(dir, name)
if err := os.Symlink(exe, target); err != nil {
data, readErr := os.ReadFile(exe)
if readErr != nil {
t.Fatalf("reading test binary for fake gopls: %v", readErr)
}
if writeErr := os.WriteFile(target, data, 0o755); writeErr != nil {
t.Fatalf("copying fake gopls: %v", writeErr)
}
}
t.Setenv("PATH", dir+string(os.PathListSeparator)+os.Getenv("PATH"))
t.Setenv(fakeGoplsEnvVar, "1")
p, err := NewGoplsProxy(context.Background())
if err != nil {
t.Fatalf("NewGoplsProxy: %v", err)
}
return p
}
func shutdownProxy(t *testing.T, p *GoplsProxy) {
t.Helper()
if err := p.Shutdown(); err != nil {
t.Errorf("Shutdown: %v", err)
}
}
func TestGoplsProxyLifecycle(t *testing.T) {
p := startFakeGopls(t)
if err := p.Initialize("file:///workspace"); err != nil {
t.Fatalf("Initialize: %v", err)
}
if p.rootURI != "file:///workspace" {
t.Errorf("rootURI = %q, want %q", p.rootURI, "file:///workspace")
}
hover, err := p.Hover("file:///main.go", Position{Line: 7, Character: 12})
if err != nil {
t.Fatalf("Hover: %v", err)
}
if hover == nil {
t.Fatal("Hover returned nil, want hover content")
}
want := "hover:file:///main.go:7:12"
if hover.Contents.Value != want {
t.Errorf("hover value = %q, want %q", hover.Contents.Value, want)
}
if hover.Contents.Kind != "markdown" {
t.Errorf("hover kind = %q, want markdown", hover.Contents.Kind)
}
shutdownProxy(t, p)
}
func TestGoplsProxyRequests(t *testing.T) {
p := startFakeGopls(t)
defer shutdownProxy(t, p)
if err := p.Initialize("file:///ws"); err != nil {
t.Fatalf("Initialize: %v", err)
}
t.Run("virtual file lifecycle notifications", func(t *testing.T) {
if err := p.OpenVirtualFile("file:///ws/a_gsx_generated.go", "package a", 1); err != nil {
t.Fatalf("OpenVirtualFile: %v", err)
}
if vf := p.virtualFiles["file:///ws/a_gsx_generated.go"]; vf == nil || vf.Content != "package a" || vf.Version != 1 {
t.Errorf("virtual file not tracked after open: %+v", vf)
}
if err := p.UpdateVirtualFile("file:///ws/a_gsx_generated.go", "package a // v2", 2); err != nil {
t.Fatalf("UpdateVirtualFile: %v", err)
}
if vf := p.virtualFiles["file:///ws/a_gsx_generated.go"]; vf == nil || vf.Content != "package a // v2" || vf.Version != 2 {
t.Errorf("virtual file not updated: %+v", vf)
}
if err := p.UpdateVirtualFile("file:///ws/untracked.go", "x", 1); err != nil {
t.Fatalf("UpdateVirtualFile untracked: %v", err)
}
if _, ok := p.virtualFiles["file:///ws/untracked.go"]; ok {
t.Error("update created an entry for an untracked file")
}
if err := p.CloseVirtualFile("file:///ws/a_gsx_generated.go"); err != nil {
t.Fatalf("CloseVirtualFile: %v", err)
}
if _, ok := p.virtualFiles["file:///ws/a_gsx_generated.go"]; ok {
t.Error("virtual file still tracked after close")
}
result, err := p.call("test/seen", nil)
if err != nil {
t.Fatalf("test/seen: %v", err)
}
var seen []string
if err := json.Unmarshal(result, &seen); err != nil {
t.Fatalf("parsing seen log: %v", err)
}
if len(seen) != 4 {
t.Fatalf("seen %d notifications, want 4: %v", len(seen), seen)
}
checks := []struct{ method, substr string }{
{"textDocument/didOpen", `"text":"package a"`},
{"textDocument/didChange", `"text":"package a // v2"`},
{"textDocument/didChange", `"uri":"file:///ws/untracked.go"`},
{"textDocument/didClose", `"uri":"file:///ws/a_gsx_generated.go"`},
}
for i, c := range checks {
if !strings.HasPrefix(seen[i], c.method) {
t.Errorf("seen[%d] = %q, want method %q", i, seen[i], c.method)
}
if !strings.Contains(seen[i], c.substr) {
t.Errorf("seen[%d] = %q, want substring %q", i, seen[i], c.substr)
}
}
if !strings.Contains(seen[0], `"version":1`) || !strings.Contains(seen[1], `"version":2`) {
t.Errorf("versions not propagated in notifications: %v", seen[:2])
}
})
t.Run("completion list form", func(t *testing.T) {
items, err := p.Completion("file:///ws/x.go", Position{Line: 1, Character: 1})
if err != nil {
t.Fatalf("Completion: %v", err)
}
if len(items) != 1 || items[0].Label != "Println" || items[0].Kind != 3 {
t.Errorf("items = %+v, want one Println item with kind 3", items)
}
if items[0].Detail != "func(a ...any) (n int, err error)" {
t.Errorf("detail = %q", items[0].Detail)
}
})
t.Run("completion array form", func(t *testing.T) {
items, err := p.Completion("file:///ws/arraycomp.go", Position{})
if err != nil {
t.Fatalf("Completion: %v", err)
}
if len(items) != 1 || items[0].Label != "ArrayItem" || items[0].Kind != 6 {
t.Errorf("items = %+v, want one ArrayItem with kind 6", items)
}
})
t.Run("completion malformed result", func(t *testing.T) {
_, err := p.Completion("file:///ws/badcomp.go", Position{})
if err == nil || !strings.Contains(err.Error(), "parsing completion result") {
t.Errorf("err = %v, want parsing completion result error", err)
}
})
t.Run("hover null result", func(t *testing.T) {
hover, err := p.Hover("file:///ws/nullhover.go", Position{})
if err != nil {
t.Fatalf("Hover: %v", err)
}
if hover != nil {
t.Errorf("hover = %+v, want nil", hover)
}
})
t.Run("hover malformed result", func(t *testing.T) {
_, err := p.Hover("file:///ws/badhover.go", Position{})
if err == nil || !strings.Contains(err.Error(), "parsing hover result") {
t.Errorf("err = %v, want parsing hover result error", err)
}
})
t.Run("definition array form", func(t *testing.T) {
locs, err := p.Definition("file:///ws/x.go", Position{Line: 3, Character: 5})
if err != nil {
t.Fatalf("Definition: %v", err)
}
want := []Location{{
URI: "file:///def.go",
Range: Range{
Start: Position{Line: 3, Character: 4},
End: Position{Line: 3, Character: 9},
},
}}
if len(locs) != 1 || locs[0] != want[0] {
t.Errorf("locs = %+v, want %+v", locs, want)
}
})
t.Run("definition single object form", func(t *testing.T) {
locs, err := p.Definition("file:///ws/singledef.go", Position{})
if err != nil {
t.Fatalf("Definition: %v", err)
}
if len(locs) != 1 || locs[0].URI != "file:///single.go" || locs[0].Range.Start.Character != 2 {
t.Errorf("locs = %+v, want single location for file:///single.go", locs)
}
})
t.Run("definition null result", func(t *testing.T) {
locs, err := p.Definition("file:///ws/nulldef.go", Position{})
if err != nil {
t.Fatalf("Definition: %v", err)
}
if locs != nil {
t.Errorf("locs = %+v, want nil", locs)
}
})
t.Run("definition malformed result", func(t *testing.T) {
_, err := p.Definition("file:///ws/baddef.go", Position{})
if err == nil || !strings.Contains(err.Error(), "parsing definition result") {
t.Errorf("err = %v, want parsing definition result error", err)
}
})
t.Run("error response", func(t *testing.T) {
_, err := p.call("test/error", nil)
if err == nil || !strings.Contains(err.Error(), "gopls error -32601: method not found") {
t.Errorf("err = %v, want gopls error -32601", err)
}
})
t.Run("reader skips bare and garbage messages", func(t *testing.T) {
if err := p.notify("test/sendBare", nil); err != nil {
t.Fatalf("notify sendBare: %v", err)
}
if err := p.notify("test/sendGarbage", nil); err != nil {
t.Fatalf("notify sendGarbage: %v", err)
}
hover, err := p.Hover("file:///ws/alive.go", Position{Line: 1, Character: 2})
if err != nil {
t.Fatalf("Hover after junk messages: %v", err)
}
if hover == nil || hover.Contents.Value != "hover:file:///ws/alive.go:1:2" {
t.Errorf("hover = %+v, reader did not survive junk messages", hover)
}
})
t.Run("diagnostics round trip with translation", func(t *testing.T) {
p.SetSourceMapLookup(func(gsxURI string) func(int, int) (int, int, bool) {
if gsxURI != "file:///ws/counter.gsx" {
return nil
}
return func(goLine, goCol int) (int, int, bool) {
if goLine == 50 {
return 0, 0, false
}
return goLine + 100, goCol + 200, true
}
})
got := make(chan struct {
uri string
diags []GoplsDiagnostic
}, 1)
p.SetDiagnosticCallback(func(uri string, diags []GoplsDiagnostic) {
got <- struct {
uri string
diags []GoplsDiagnostic
}{uri, diags}
})
diagRange := func(line, ch int) Range {
return Range{Start: Position{Line: line, Character: ch}, End: Position{Line: line, Character: ch + 3}}
}
send := func(uri string, diags []goplsDiagnostic) {
params := publishDiagnosticsParams{URI: uri, Diagnostics: diags}
if err := p.notify("test/publishDiagnostics", params); err != nil {
t.Fatalf("notify publishDiagnostics: %v", err)
}
}
send("file:///ws/counter_gsx_generated.go", []goplsDiagnostic{
{Range: diagRange(5, 1), Severity: 1, Message: "virtual file error"},
})
send("file:///ws/regular.go", []goplsDiagnostic{
{Range: diagRange(5, 1), Severity: 1, Message: "regular file error"},
})
send("file:///ws/counter_gsx.go", []goplsDiagnostic{
{Range: diagRange(5, 1), Severity: 1, Message: "Counter redeclared in this block"},
{Range: diagRange(6, 1), Severity: 1, Message: "Counter redeclared, see counter_gsx.go"},
{Range: diagRange(7, 1), Severity: 1, Message: "unknown field Foo in struct literal"},
{Range: diagRange(51, 1), Severity: 1, Message: "unmapped position error"},
{Range: diagRange(10, 4), Severity: 2, Message: "undefined: frobnicate"},
})
select {
case res := <-got:
if res.uri != "file:///ws/counter.gsx" {
t.Errorf("callback uri = %q, want file:///ws/counter.gsx", res.uri)
}
if len(res.diags) != 1 {
t.Fatalf("callback got %d diagnostics, want 1 (filtering failed): %+v", len(res.diags), res.diags)
}
d := res.diags[0]
if d.Message != "undefined: frobnicate" || d.Severity != 2 || d.Source != "gopls" {
t.Errorf("diag = %+v, want undefined: frobnicate severity 2 source gopls", d)
}
wantRange := Range{
Start: Position{Line: 109, Character: 204},
End: Position{Line: 109, Character: 207},
}
if d.Range != wantRange {
t.Errorf("diag range = %+v, want %+v", d.Range, wantRange)
}
case <-time.After(5 * time.Second):
t.Fatal("timed out waiting for diagnostic callback")
}
})
}
func TestNewGoplsProxyNotFound(t *testing.T) {
t.Setenv("PATH", t.TempDir())
_, err := NewGoplsProxy(context.Background())
if err == nil || !strings.Contains(err.Error(), "gopls not found in PATH") {
t.Errorf("err = %v, want gopls not found in PATH", err)
}
}
type nopWriteCloser struct{ io.Writer }
func (nopWriteCloser) Close() error { return nil }
type failWriteCloser struct{}
func (failWriteCloser) Write([]byte) (int, error) { return 0, errors.New("stdin closed") }
func (failWriteCloser) Close() error { return nil }
func TestCallContextCanceled(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
cancel()
p := &GoplsProxy{
stdin: nopWriteCloser{io.Discard},
pending: make(map[int64]chan *Response),
ctx: ctx,
cancel: cancel,
}
_, err := p.call("textDocument/hover", nil)
if !errors.Is(err, context.Canceled) {
t.Errorf("err = %v, want context.Canceled", err)
}
}
func TestSendErrors(t *testing.T) {
t.Run("write failure", func(t *testing.T) {
p := &GoplsProxy{stdin: failWriteCloser{}}
err := p.send(Request{JSONRPC: "2.0", Method: "x"})
if err == nil || !strings.Contains(err.Error(), "stdin closed") {
t.Errorf("err = %v, want stdin closed", err)
}
})
t.Run("marshal failure", func(t *testing.T) {
p := &GoplsProxy{stdin: nopWriteCloser{io.Discard}}
err := p.send(Request{JSONRPC: "2.0", Method: "x", Params: make(chan int)})
if err == nil {
t.Error("err = nil, want JSON marshal error for channel param")
}
})
t.Run("call surfaces send failure", func(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
p := &GoplsProxy{
stdin: failWriteCloser{},
pending: make(map[int64]chan *Response),
ctx: ctx,
cancel: cancel,
}
_, err := p.call("textDocument/hover", nil)
if err == nil || !strings.Contains(err.Error(), "stdin closed") {
t.Errorf("err = %v, want stdin closed", err)
}
})
}
func TestReadMessageErrors(t *testing.T) {
type tc struct {
input string
wantErr string
}
tests := map[string]tc{
"invalid content length": {
input: "Content-Length: abc\r\n\r\n",
wantErr: "invalid Content-Length",
},
"missing content length": {
input: "\r\n",
wantErr: "missing Content-Length header",
},
"truncated content": {
input: "Content-Length: 100\r\n\r\nshort",
wantErr: "reading content",
},
"eof on headers": {
input: "",
wantErr: "EOF",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
p := &GoplsProxy{stdout: bufio.NewReader(strings.NewReader(tt.input))}
_, err := p.readMessage()
if err == nil || !strings.Contains(err.Error(), tt.wantErr) {
t.Errorf("err = %v, want substring %q", err, tt.wantErr)
}
})
}
}
func TestReadMessageSuccess(t *testing.T) {
payload := `{"jsonrpc":"2.0","id":1,"result":null}`
input := fmt.Sprintf("Content-Length: %d\r\nContent-Type: application/json\r\n\r\n%s", len(payload), payload)
p := &GoplsProxy{stdout: bufio.NewReader(strings.NewReader(input))}
msg, err := p.readMessage()
if err != nil {
t.Fatalf("readMessage: %v", err)
}
if string(msg) != payload {
t.Errorf("msg = %q, want %q", msg, payload)
}
}
func TestHandleNotificationSkipBranches(t *testing.T) {
type tc struct {
method string
params string
lookup SourceMapLookup
}
tests := map[string]tc{
"non diagnostic method": {
method: "window/showMessage",
params: `{}`,
},
"malformed params": {
method: "textDocument/publishDiagnostics",
params: `{not json`,
},
"nil lookup": {
method: "textDocument/publishDiagnostics",
params: `{"uri":"file:///a_gsx.go","diagnostics":[{"range":{"start":{"line":1,"character":0},"end":{"line":1,"character":1}},"severity":1,"message":"x"}]}`,
lookup: nil,
},
"lookup returns nil translator": {
method: "textDocument/publishDiagnostics",
params: `{"uri":"file:///a_gsx.go","diagnostics":[{"range":{"start":{"line":1,"character":0},"end":{"line":1,"character":1}},"severity":1,"message":"x"}]}`,
lookup: func(string) func(int, int) (int, int, bool) { return nil },
},
"all diagnostics filtered yields no callback": {
method: "textDocument/publishDiagnostics",
params: `{"uri":"file:///a_gsx.go","diagnostics":[{"range":{"start":{"line":1,"character":0},"end":{"line":1,"character":1}},"severity":1,"message":"foo redeclared in this block"}]}`,
lookup: func(string) func(int, int) (int, int, bool) {
return func(l, c int) (int, int, bool) { return l, c, true }
},
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
p := &GoplsProxy{}
p.SetSourceMapLookup(tt.lookup)
called := false
p.SetDiagnosticCallback(func(string, []GoplsDiagnostic) { called = true })
p.handleNotification(&Notification{
JSONRPC: "2.0",
Method: tt.method,
Params: json.RawMessage(tt.params),
})
if called {
t.Error("diagnostic callback invoked, want skipped")
}
})
}
}
func TestURIHelpers(t *testing.T) {
type tc struct {
fn func(string) string
in string
want string
}
tests := map[string]tc{
"TuiURIToGoURI gsx file": {
fn: TuiURIToGoURI,
in: "file:///ws/counter.gsx",
want: "file:///ws/counter_gsx_generated.go",
},
"TuiURIToGoURI non gsx file": {
fn: TuiURIToGoURI,
in: "file:///ws/counter.txt",
want: "file:///ws/counter.txt_generated.go",
},
"GoURIToTuiURI virtual file": {
fn: GoURIToTuiURI,
in: "file:///ws/counter_gsx_generated.go",
want: "file:///ws/counter.gsx",
},
"GoURIToTuiURI passthrough": {
fn: GoURIToTuiURI,
in: "file:///ws/other.go",
want: "file:///ws/other.go",
},
"GetVirtualFilePath gsx file": {
fn: GetVirtualFilePath,
in: "/ws/app/counter.gsx",
want: "/ws/app/counter_gsx_generated.go",
},
"GetVirtualFilePath non gsx file": {
fn: GetVirtualFilePath,
in: "/ws/app/counter.txt",
want: "/ws/app/counter.txt_generated.go",
},
"GeneratedGoURIToTuiURI generated file": {
fn: GeneratedGoURIToTuiURI,
in: "file:///ws/counter_gsx.go",
want: "file:///ws/counter.gsx",
},
"GeneratedGoURIToTuiURI passthrough": {
fn: GeneratedGoURIToTuiURI,
in: "file:///ws/other.go",
want: "file:///ws/other.go",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
if got := filepath.ToSlash(tt.fn(tt.in)); got != tt.want {
t.Errorf("got %q, want %q", got, tt.want)
}
})
}
}
func TestFileKindPredicates(t *testing.T) {
type tc struct {
fn func(string) bool
in string
want bool
}
tests := map[string]tc{
"IsVirtualGoFile true": {
fn: IsVirtualGoFile,
in: "file:///ws/counter_gsx_generated.go",
want: true,
},
"IsVirtualGoFile false": {
fn: IsVirtualGoFile,
in: "file:///ws/counter_gsx.go",
want: false,
},
"IsGeneratedGoFile true": {
fn: IsGeneratedGoFile,
in: "file:///ws/counter_gsx.go",
want: true,
},
"IsGeneratedGoFile false for virtual": {
fn: IsGeneratedGoFile,
in: "file:///ws/counter_gsx_generated.go",
want: false,
},
"IsGeneratedGoFile false for plain go": {
fn: IsGeneratedGoFile,
in: "file:///ws/main.go",
want: false,
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
if got := tt.fn(tt.in); got != tt.want {
t.Errorf("got %v, want %v", got, tt.want)
}
})
}
}
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