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|
package gololang_test
import (
"context"
"errors"
"os"
"os/exec"
"path/filepath"
"slices"
"strings"
"testing"
"time"
"github.com/gdamore/tcell/v2"
"rickub.com/turbo-editors/turbo-core/app"
"rickub.com/turbo-editors/turbo-core/buffer"
"rickub.com/turbo-editors/turbo-core/lsp"
"rickub.com/turbo-editors/turbo-core/syntax"
"rickub.com/turbo-editors/turbo-core/ui"
"rickub.com/turbo-editors/turbo-golo/internal/gololang"
)
// --- the editor, assembled --------------------------------------------------
func TestTheEditorCallsItselfTurboGolo(t *testing.T) {
editor := newTestEditor(t)
if got := editor.Profile().Name; got != gololang.Name {
t.Errorf("Profile().Name = %q, want %q", got, gololang.Name)
}
if got := editor.Profile().ProjectDir(); got != ".turbo-golo" {
t.Errorf("ProjectDir() = %q, want %q", got, ".turbo-golo")
}
}
func TestTheEditorColoursGoloSourceItOpens(t *testing.T) {
// The whole path in one test: Register taught the library about Golo, the
// profile named the editor, and a .golo file opened through the public
// API comes out coloured.
root := t.TempDir()
path := filepath.Join(root, "main.golo")
writeFile(t, path, "module demo.Main\n\nfunction main = |args| {\n println(\"hi\")\n}\n")
editor := newTestEditor(t)
editor.Open(path)
if got := editor.ActiveView().Language(); got != gololang.Language {
t.Fatalf("the view colours the file as %q, want %q", got, gololang.Language)
}
if spans := syntax.Highlight(gololang.Language, "function main = |args| {"); len(spans[0]) == 0 {
t.Error("the registered Golo scanner colours nothing")
}
}
func TestAScriptWithAShebangAndNoExtensionIsGoloToo(t *testing.T) {
// A script run as a command has no extension; its first line is what
// identifies it, and the editor reads that line before choosing a scanner.
root := t.TempDir()
path := filepath.Join(root, "greet")
writeFile(t, path, "#!/usr/bin/env golo\nmodule Greet\n\nfunction main = |args| {\n println(\"hi\")\n}\n")
editor := newTestEditor(t)
editor.Open(path)
if got := editor.ActiveView().Language(); got != gololang.Language {
t.Errorf("a script opening with a golo shebang is coloured as %q, want %q", got, gololang.Language)
}
}
func TestTheEditorDoesNotColourMoonBit(t *testing.T) {
// "Golo instead of MoonBit" is the whole point of this editor being a
// separate one: a .mbt file opens as plain text here.
root := t.TempDir()
path := filepath.Join(root, "main.mbt")
writeFile(t, path, "fn main {\n println(\"hi\")\n}\n")
editor := newTestEditor(t)
editor.Open(path)
if got := editor.ActiveView().Language(); got != syntax.LanguageNone {
t.Errorf("a .mbt file is coloured as %q; Turbo Golo registers Golo, not MoonBit", got)
}
}
func TestAProjectsOwnFilesAreStillColouredByTheLibrary(t *testing.T) {
// A README, a compose file and a Dockerfile are what a Golo project is
// made of besides its scripts, and turbo-core colours all three without
// this editor doing anything. That the inherited languages survive
// registration is worth one test, because syntax.Register writes into
// package-level state.
root := t.TempDir()
editor := newTestEditor(t)
for name, want := range map[string]syntax.Language{
"README.md": syntax.LanguageMarkdown,
"compose.yaml": syntax.LanguageYAML,
"Dockerfile": syntax.LanguageDockerfile,
} {
path := filepath.Join(root, name)
writeFile(t, path, "# heading\n")
editor.Open(path)
if got := editor.ActiveView().Language(); got != want {
t.Errorf("%s is coloured as %q, want %q", name, got, want)
}
}
}
func TestTheToolchainMenuIsCalledGoloAndNoTwoMenusShareAHotKey(t *testing.T) {
// The bar answers the first menu whose hot key matches, so a clash makes
// one of the two unreachable from the keyboard — silently, and with every
// other test still passing. Golo takes G because none of the fixed menus
// does, which is exactly the sort of thing only this test notices.
editor := newTestEditor(t)
seen := map[rune]string{}
found := false
for _, menu := range editor.MenuBar().Menus() {
label, hot, _ := ui.SplitHotKey(menu.Label)
if label == "Golo" {
found = true
}
if hot == 0 {
t.Errorf("the %q menu has no hot key", label)
continue
}
if other, clash := seen[hot]; clash {
t.Errorf("%q and %q both answer to Alt-%c", other, label, hot)
}
seen[hot] = label
}
if !found {
t.Error("there is no Golo menu on the bar")
}
}
// --- driven against a real golo lsp -----------------------------------------
// TestCompletionEndToEndWithRealGoloLSP drives the exact sequence the command
// does at start-up: open the file first, start the language server second,
// then ask for a completion.
//
// That order is the whole point, and it is the one Turbo Go got wrong once: an
// editor that announces its open documents to a server which does not exist yet
// and never mentions them again gets answers about a file the server has never
// heard of — which looks, from the outside, exactly like completion not
// working.
//
// It skips itself when golo is not installed, and under -short.
func TestCompletionEndToEndWithRealGoloLSP(t *testing.T) {
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
// Both lines on disk are blank. A function is *declared* by typing, at top
// level, then its name is typed inside main, so the answer can only come from
// what the editor told the server — which is the whole point of this
// test. golo lsp offers keywords and builtins for any file at all, so a
// completion holding println would prove nothing; a completion holding a
// function that exists only in the buffer proves the buffer was sent.
view := editor.ActiveView()
view.Buffer().SetCursor(buffer.Position{Line: declarationLine, Col: 0})
typeText(editor, "function zorglub = |x| -> x + 1")
view.Buffer().SetCursor(buffer.Position{Line: completionLine, Col: 2})
typeText(editor, "zorg")
if !waitForCompletion(t, editor) {
t.Fatalf("no completion list opened for %s; the status bar says %q", path, editor.StatusBar().Message())
}
if !completionOffers(editor, "zorglub") {
t.Errorf("the list does not offer the function typed into the buffer; it has %d entries", editor.Completion().Count())
}
}
// The scanner's builtin table is read out of GoloScript rather than remembered,
// and this is where that claim is checked against the binary itself: the
// completion golo lsp offers for an empty prefix lists every keyword and every
// builtin it knows, so the two tables can be compared in both directions.
func TestTheScannersTablesMatchWhatTheServerOffers(t *testing.T) {
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
var offered []lsp.CompletionItem
waitUntil(t, 30*time.Second, func() bool {
ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
defer cancel()
items, err := editor.Language().Complete(ctx, path, completionLine, 2, " ")
if err != nil {
return false
}
offered = items
return len(offered) > 0
})
labels := map[string]bool{}
for _, item := range offered {
labels[item.Label] = true
}
for _, builtin := range gololang.Builtins() {
if !labels[builtin] {
t.Errorf("the scanner colours %q as a builtin, and golo lsp does not offer it", builtin)
}
}
for _, keyword := range gololang.Keywords() {
if !labels[keyword] {
t.Errorf("the scanner colours %q as a keyword, and golo lsp does not offer it", keyword)
}
}
// The other direction: everything the server offers that is not a keyword,
// a literal or a function the fixture declares must be in the builtin
// table, or the table has fallen behind the interpreter.
known := map[string]bool{"true": true, "false": true, "null": true}
for _, word := range append(gololang.Keywords(), gololang.Builtins()...) {
known[word] = true
}
for _, declared := range []string{"helper", "first", "second", "main"} {
known[declared] = true
}
for label := range labels {
if !known[label] {
t.Errorf("golo lsp offers %q, which the scanner knows nothing about", label)
}
}
}
func TestGoToDefinitionWithRealGoloLSP(t *testing.T) {
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
locations := waitForLocations(t, func(ctx context.Context) ([]lsp.Location, error) {
return editor.Language().Definition(ctx, path, callLine, callColumn, callLineText)
})
if len(locations) != 1 {
t.Fatalf("the call to helper has %d definitions, want exactly 1: %v", len(locations), locations)
}
if got := locations[0].Range.Start.Line; got != helperLine {
t.Errorf("the definition of helper is on line %d, want %d", got, helperLine)
}
}
func TestHoverShowsTheCommentAboveADeclarationWithRealGoloLSP(t *testing.T) {
// A block of # comments above a declaration is its documentation, and the
// server shows it on hover. This is what F1 — Code ▸ Describe symbol —
// draws, and it is the one answer here that carries prose a person wrote.
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
var text string
waitUntil(t, 30*time.Second, func() bool {
ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
defer cancel()
answer, err := editor.Language().Hover(ctx, path, callLine, callColumn, callLineText)
if err != nil {
return false
}
text = answer
return text != ""
})
if !strings.Contains(text, "Adds one") {
t.Errorf("hovering helper gave %q, want the comment written above its declaration", text)
}
}
func TestTheSymbolsOfAFileWithRealGoloLSP(t *testing.T) {
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
var symbols []lsp.Symbol
waitUntil(t, 30*time.Second, func() bool {
ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
defer cancel()
found, err := editor.Language().DocumentSymbols(ctx, path)
if err != nil {
return false
}
symbols = found
return len(symbols) > 0
})
names := map[string]bool{}
for _, symbol := range symbols {
names[symbol.Name] = true
}
for _, want := range []string{"helper", "first", "second", "main"} {
if !names[want] {
t.Errorf("the file's symbols do not include %q: %v", want, names)
}
}
}
// Diagnostics are the one thing a language server sends without being asked,
// and the only feature whose failure looks exactly like success: an editor with
// no error to show and one that cannot find the error are the same blank
// gutter. So this opens a file that does not parse and waits for the mark.
func TestDiagnosticsForAFileThatDoesNotParseWithRealGoloLSP(t *testing.T) {
root, editor := startRealServerOn(t, brokenScript)
path := filepath.Join(root, "main.golo")
waitUntil(t, 30*time.Second, func() bool {
editor.Tick()
return len(editor.Language().Diagnostics(path)) > 0
})
problems := editor.Language().Diagnostics(path)
if len(problems) == 0 {
t.Fatalf("no diagnostic ever arrived for %s; the status bar says %q", path, editor.StatusBar().Message())
}
if _, ok := editor.Language().FirstError(path); !ok {
t.Errorf("the diagnostics hold no error, only %v", problems)
}
}
// A C-style comment is the mistake everybody coming from another language
// makes, and golo lsp lints it rather than merely failing to parse it. It is
// the diagnostic a new Golo programmer meets first, so it is the one checked
// by name.
func TestACStyleCommentIsDiagnosedWithRealGoloLSP(t *testing.T) {
root, editor := startRealServerOn(t, "module demo.Lint\n\n// not a Golo comment\nfunction main = |args| {\n println(\"hi\")\n}\n")
path := filepath.Join(root, "main.golo")
waitUntil(t, 30*time.Second, func() bool {
editor.Tick()
return len(editor.Language().Diagnostics(path)) > 0
})
var messages []string
for _, problem := range editor.Language().Diagnostics(path) {
messages = append(messages, problem.Message)
}
if !slices.ContainsFunc(messages, func(m string) bool { return strings.Contains(m, "#") }) {
t.Errorf("the C-style comment was not diagnosed as one; the server said %v", messages)
}
}
// golo lsp advertises neither referencesProvider, typeDefinitionProvider,
// implementationProvider nor workspaceSymbolProvider, so four of the nine
// questions turbo-core asks come back empty. That is documented in
// how-to/enable-completion.md, and this test is what keeps the documentation
// honest: if a future golo answers any of them, this fails and the page gets
// revisited.
func TestFindReferencesWithRealGoloLSP(t *testing.T) {
// GoloScript v0.2.0 started answering references. Asked from a call, the
// answer is the declaration and every call within the file; a use in
// another file of the same project is not found, because the server
// resolves nothing across files.
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
locations := waitForLocations(t, func(ctx context.Context) ([]lsp.Location, error) {
return editor.Language().References(ctx, path, callLine, callColumn, callLineText)
})
lines := map[int]bool{}
for _, location := range locations {
if !strings.HasSuffix(location.URI, "/main.golo") {
t.Errorf("a reference points outside the file: %v", location)
}
lines[location.Range.Start.Line] = true
}
for _, want := range []int{helperLine, callLine, secondCallLine} {
if !lines[want] {
t.Errorf("the references to helper miss line %d: %v", want, locations)
}
}
if len(locations) != 3 {
t.Errorf("helper has %d references, want 3 (the declaration and two calls): %v", len(locations), locations)
}
}
func TestFindImplementationsWithRealGoloLSP(t *testing.T) {
// GoloScript v0.2.0 started answering implementations, with the function's
// declaration: Golo has no interfaces, so a function is its own
// implementation, and the answer is the same place F12 goes.
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
locations := waitForLocations(t, func(ctx context.Context) ([]lsp.Location, error) {
return editor.Language().Implementation(ctx, path, callLine, callColumn, callLineText)
})
if len(locations) != 1 {
t.Fatalf("the call to helper has %d implementations, want exactly 1: %v", len(locations), locations)
}
if got := locations[0].Range.Start.Line; got != helperLine {
t.Errorf("the implementation of helper is on line %d, want its declaration on %d", got, helperLine)
}
}
func TestSymbolsAcrossTheProjectWithRealGoloLSP(t *testing.T) {
// GoloScript v0.2.0 started answering workspace/symbol. It searches every
// .golo file under the root, not only the ones the editor has opened, so
// the second file here is written and never announced to the server.
root, editor := startRealServer(t)
writeFile(t, filepath.Join(root, "other.golo"), "module demo.Other\n\nfunction elsewhere = |x| {\n return x\n}\n")
find := func(query string) []lsp.Symbol {
var symbols []lsp.Symbol
waitUntil(t, 30*time.Second, func() bool {
ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
defer cancel()
found, err := editor.Language().WorkspaceSymbols(ctx, query)
if err != nil {
return false
}
symbols = found
return len(symbols) > 0
})
return symbols
}
if symbols := find("helper"); len(symbols) == 0 || symbols[0].Name != "helper" {
t.Errorf("searching the project for helper gave %v", symbols)
}
if symbols := find("elsewhere"); len(symbols) == 0 || symbols[0].Name != "elsewhere" {
t.Errorf("searching the project for a function in a file the editor never opened gave %v", symbols)
}
}
func TestGoloLSPDoesNotAnswerTypeDefinitionWithRealGoloLSP(t *testing.T) {
// The one question of the Code menu the server does not advertise. The
// documentation says so, and this fails the day a future golo answers it —
// which is how the three tests above came to exist: until GoloScript
// v0.2.0 references, implementations and project-wide symbols were refused
// too, and the test that pinned all four went red on 2026-09-19.
root, editor := startRealServer(t)
path := filepath.Join(root, "main.golo")
ctx, cancel := context.WithTimeout(t.Context(), 15*time.Second)
defer cancel()
if found, err := editor.Language().TypeDefinition(ctx, path, helperLine, helperColumn, helperLineText); err == nil && len(found) > 0 {
t.Errorf("golo lsp now answers type definitions (%v); how-to/enable-completion.md says it does not", found)
}
}
// --- the fixtures and the waiting -------------------------------------------
// realScript is the file every language-server test works against. Line
// numbers are counted from zero and are named by the constants below, so
// inserting a line here moves them and the constants have to move too.
//
// 0 module demo.Main
// 1
// 2 # Adds one.
// 3 function helper = |x| {
// 4 return x + 1
// 5 }
// 6
// 7 function first = |x| {
// 8 return helper(x)
// 9 }
// 10
// 11 function second = |x| {
// 12 return helper(x) * 2
// 13 }
// 14 ← where the declaration is typed, at top level: golo lsp offers only
// 15 top-level functions, so one typed inside main would never appear
// 16 function main = |args| {
// 17 let text = "hi"
// 18 ← two spaces, and where the completion is typed
// 19 println(first(1) + second(2) + text)
// 20 }
//
// It runs under golo with no error, which matters: a fixture the interpreter
// complains about would make the diagnostics test pass for the wrong reason.
const realScript = "module demo.Main\n" +
"\n" +
"# Adds one.\n" +
"function helper = |x| {\n" +
" return x + 1\n" +
"}\n" +
"\n" +
"function first = |x| {\n" +
" return helper(x)\n" +
"}\n" +
"\n" +
"function second = |x| {\n" +
" return helper(x) * 2\n" +
"}\n" +
"\n" +
"\n" +
"function main = |args| {\n" +
" let text = \"hi\"\n" +
" \n" +
" println(first(1) + second(2) + text)\n" +
"}\n"
// brokenScript is a file that does not parse: the closing brace of main is
// missing. It exists as a second fixture rather than as a line added to the
// first, because a file holding a syntax error is a file whose *other* answers
// are worth nothing: the completion test would then be measuring a parse that
// never finished.
const brokenScript = "module demo.Broken\n" +
"\n" +
"function main = |args| {\n" +
" let x = (1 +\n"
// Where the fixture's interesting lines are, counted from zero.
const (
declarationLine = 14
completionLine = 18
helperLine = 3
helperColumn = 9
helperLineText = "function helper = |x| {"
callLine = 8
callColumn = 9
callLineText = " return helper(x)"
secondCallLine = 12
)
// startRealServer writes a script, opens it, starts golo lsp and waits for it,
// in the order the command does. It skips the test when golo is missing.
func startRealServer(t *testing.T) (root string, editor *app.App) {
t.Helper()
return startRealServerOn(t, realScript)
}
// startRealServerOn is startRealServer over a chosen main.golo.
func startRealServerOn(t *testing.T, source string) (root string, editor *app.App) {
t.Helper()
if testing.Short() {
t.Skip("-short: not starting a language server")
}
server, err := lsp.FindServer(gololang.Profile().Server)
if errors.Is(err, lsp.ErrServerNotFound) {
t.Skipf("%s is not installed; %s", gololang.ServerCommand, gololang.InstallHint)
}
// Finding it is not the same as being able to run it: a shim left behind by
// a tool manager whose environment has since been removed is on PATH and
// fails only when started.
if !serverRuns(server) {
t.Skipf("%s at %s cannot run; %s", gololang.ServerCommand, server, gololang.InstallHint)
}
root = t.TempDir()
writeFile(t, filepath.Join(root, "main.golo"), source)
editor = newTestEditor(t)
// 1. Open the file, exactly as main does — before there is any server.
editor.Open(filepath.Join(root, "main.golo"))
// 2. Start the language server, exactly as main does — afterwards, in the
// file's own directory, which is what ProjectRoot answers with no
// markers.
ctx, cancel := context.WithCancel(t.Context())
t.Cleanup(cancel)
editor.StartLanguageServer(ctx, root)
t.Cleanup(func() { editor.Language().Stop(context.Background()) })
waitUntilReady(t, editor)
// 3. Let the event loop notice the server is ready, as Run does on every
// turn. This is what announces the file that was already open.
editor.Tick()
return root, editor
}
// newTestEditor returns Turbo Golo drawing on a simulated terminal, set up the
// way the command sets it up.
func newTestEditor(t *testing.T) *app.App {
t.Helper()
gololang.Register()
screen := tcell.NewSimulationScreen("UTF-8")
if err := screen.Init(); err != nil {
t.Fatalf("initialising the simulation screen: %v", err)
}
t.Cleanup(screen.Fini)
screen.SetSize(80, 24)
// Never read the themes or snippets of whoever is running the tests.
p := gololang.Profile()
t.Setenv(p.ThemeDirEnvVar(), t.TempDir())
t.Setenv(p.SnippetDirEnvVar(), t.TempDir())
editor := app.New(screen, "turbo-classic", p)
editor.Render()
return editor
}
// typeText sends a run of printable characters through the whole routing chain.
func typeText(editor *app.App, text string) {
for _, r := range text {
editor.Handle(tcell.NewEventKey(tcell.KeyRune, r, tcell.ModNone))
}
}
// completionOffers reports whether the open popup holds an entry starting with
// a label.
func completionOffers(editor *app.App, label string) bool {
for _, item := range editor.Completion().Matches() {
if strings.HasPrefix(item.Label, label) {
return true
}
}
return false
}
// waitUntilReady blocks until the language server has finished starting.
func waitUntilReady(t *testing.T, editor *app.App) {
t.Helper()
deadline := time.After(lsp.InitializeTimeout)
for !editor.Language().Ready() {
select {
case <-deadline:
t.Fatalf("the language server never became ready: %s", editor.Language().Status())
case <-time.After(10 * time.Millisecond):
}
}
}
// waitUntil polls a condition until it holds or the time runs out, and fails
// the test if it never does.
func waitUntil(t *testing.T, within time.Duration, done func() bool) {
t.Helper()
deadline := time.Now().Add(within)
for time.Now().Before(deadline) {
if done() {
return
}
time.Sleep(200 * time.Millisecond)
}
t.Errorf("the server never answered within %s", within)
}
// waitForLocations asks a location question until it is answered, because a
// server that is still indexing answers an empty list rather than an error.
func waitForLocations(t *testing.T, ask func(context.Context) ([]lsp.Location, error)) []lsp.Location {
t.Helper()
var found []lsp.Location
waitUntil(t, 30*time.Second, func() bool {
ctx, cancel := context.WithTimeout(t.Context(), 5*time.Second)
defer cancel()
locations, err := ask(ctx)
if err != nil {
return false
}
found = locations
return len(found) > 0
})
return found
}
// waitForCompletion asks for a completion until one arrives, or gives up.
//
// A server may load its state after it has finished initialising, and answer
// an empty list until that is done. There is no notification this client reads
// that says when — so it asks again, which is what the editor's user would do.
func waitForCompletion(t *testing.T, editor *app.App) bool {
t.Helper()
deadline := time.Now().Add(60 * time.Second)
for time.Now().Before(deadline) {
if editor.Completion().Visible() {
return true
}
editor.RequestCompletion()
if editor.Completion().Visible() {
return true
}
time.Sleep(500 * time.Millisecond)
}
return false
}
// serverRuns reports whether the language server at path actually starts.
func serverRuns(path string) bool {
return exec.Command(path, "--version").Run() == nil
}
// writeFile creates a file, making its directory first.
func writeFile(t *testing.T, path, content string) {
t.Helper()
if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
t.Fatalf("creating %s: %v", filepath.Dir(path), err)
}
if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
t.Fatalf("writing %s: %v", path, err)
}
}
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