test(drive): cover dry-run collisions on Linux

internal/helpers/drive_pull.go

@@ -184,7 +184,8 @@ func runDrivePull(cmd *cobra.Command, _ []string) error {
 	}
 	sort.Strings(relPaths)
 	if deps.Caller.DryRun() {
-		return printDrivePullDryRun(absDir, ifExists, remote, relPaths)
+		caseInsensitive := runtime.GOOS == "windows" || runtime.GOOS == "darwin"
+		return printDrivePullDryRun(absDir, ifExists, remote, relPaths, caseInsensitive)
 	}
 
 	// 落盘前先按目标文件系统的路径等价规则做一次全局冲突检查：大小写不敏感 FS 上
@@ -246,9 +247,8 @@ func runDrivePull(cmd *cobra.Command, _ []string) error {
 	return deps.Out.PrintJSON(res)
 }
 
-func printDrivePullDryRun(absDir, ifExists string, remote map[string]*remoteFile, relPaths []string) error {
+func printDrivePullDryRun(absDir, ifExists string, remote map[string]*remoteFile, relPaths []string, caseInsensitive bool) error {
 	plan := drivePullResult{Items: make([]drivePullItem, 0, len(relPaths))}
-	caseInsensitive := runtime.GOOS == "windows" || runtime.GOOS == "darwin"
 	collided := detectTargetCollisions(absDir, relPaths, caseInsensitive)
 	for _, rel := range relPaths {
 		if collided[rel] {

internal/helpers/drive_sync_confirmation_test.go

@@ -219,14 +219,14 @@ func TestCrossPlatformCoverageDrivePull_dryRunPlanBranches(t *testing.T) {
 	t.Cleanup(func() { deps = prevDeps })
 
 	if err := printDrivePullDryRun(root, ifExistsSkip, remote,
-		[]string{"A.txt", "a.txt", "../escape", "skip.txt", "new.txt"}); err != nil {
+		[]string{"A.txt", "a.txt", "../escape", "skip.txt", "new.txt"}, true); err != nil {
 		t.Fatalf("skip plan: %v", err)
 	}
 	if text := out.String(); !strings.Contains(text, pullActionFailed) || !strings.Contains(text, pullActionSkipped) || !strings.Contains(text, pullActionDownloaded) {
 		t.Fatalf("skip plan did not cover failed/skipped/downloaded: %s", text)
 	}
 	out.Reset()
-	if err := printDrivePullDryRun(root, ifExistsSmart, remote, []string{"smart.txt"}); err != nil {
+	if err := printDrivePullDryRun(root, ifExistsSmart, remote, []string{"smart.txt"}, false); err != nil {
 		t.Fatalf("smart plan: %v", err)
 	}
 	if !strings.Contains(out.String(), pullActionSkipped) {