fix: enable browser executable selection

internal/platform/files/executable_picker_windows_test.go

@@ -0,0 +1,51 @@
+//go:build windows
+
+package files
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+)
+
+func TestWindowsExecutablePickerReturnsCleanAbsoluteExecutable(t *testing.T) {
+	runner := &fakeRunner{out: []byte("C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe\r\n")}
+	picker := newExecutablePickerWithRunner(runner)
+	got, err := picker.ChooseExecutable(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != `C:\Program Files\Google\Chrome\Application\chrome.exe` {
+		t.Fatalf("path = %q", got)
+	}
+	command := strings.Join(runner.args, " ")
+	if runner.name != "powershell.exe" || !strings.Contains(command, "-STA") || !strings.Contains(command, "OpenFileDialog") {
+		t.Fatalf("unexpected picker command: %s %v", runner.name, runner.args)
+	}
+}
+
+func TestWindowsExecutablePickerRejectsInvalidSelection(t *testing.T) {
+	tests := []struct {
+		name string
+		out  string
+	}{
+		{name: "relative", out: `chrome.exe`},
+		{name: "not executable", out: `C:\Browser\chrome.txt`},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			picker := newExecutablePickerWithRunner(&fakeRunner{out: []byte(test.out)})
+			if _, err := picker.ChooseExecutable(context.Background()); err == nil {
+				t.Fatal("invalid selection was accepted")
+			}
+		})
+	}
+}
+
+func TestWindowsExecutablePickerTreatsEmptySelectionAsCanceled(t *testing.T) {
+	picker := newExecutablePickerWithRunner(&fakeRunner{})
+	if _, err := picker.ChooseExecutable(context.Background()); !errors.Is(err, ErrSelectionCanceled) {
+		t.Fatalf("error = %v", err)
+	}
+}