1 files changed, 49 insertions, 0 deletions
diff --git a/gopls/internal/regtest/diagnostics/analysis_test.go b/gopls/internal/regtest/diagnostics/analysis_test.go
new file mode 100644
index 000000000..308c25f13
--- /dev/null
+++ b/gopls/internal/regtest/diagnostics/analysis_test.go
@@ -0,0 +1,49 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package diagnostics
+
+import (
+	"testing"
+
+	"golang.org/x/tools/gopls/internal/lsp/protocol"
+	. "golang.org/x/tools/gopls/internal/lsp/regtest"
+)
+
+// Test for the timeformat analyzer, following golang/vscode-go#2406.
+//
+// This test checks that applying the suggested fix from the analyzer resolves
+// the diagnostic warning.
+func TestTimeFormatAnalyzer(t *testing.T) {
+	const files = `
+-- go.mod --
+module mod.com
+
+go 1.18
+-- main.go --
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	now := time.Now()
+	fmt.Println(now.Format("2006-02-01"))
+}`
+
+	Run(t, files, func(t *testing.T, env *Env) {
+		env.OpenFile("main.go")
+
+		var d protocol.PublishDiagnosticsParams
+		env.AfterChange(
+			Diagnostics(env.AtRegexp("main.go", "2006-02-01")),
+			ReadDiagnostics("main.go", &d),
+		)
+
+		env.ApplyQuickFixes("main.go", d.Diagnostics)
+		env.AfterChange(NoDiagnostics(ForFile("main.go")))
+	})
+}