package pluginhost import (	"os"	"path/filepath"	"runtime"	"testing") func TestCandidateDirs(t *testing.T) {	got := candidateDirs("plugins", "darwin", "arm64", "v3")	want := []string{		filepath.Join("plugins", "darwin", "arm64-v3"),		filepath.Join("plugins", "darwin", "arm64"),		"plugins",	}	if len(got) != len(want) {		t.Fatalf("len(candidateDirs) = %d, want %d", len(got), len(want))	}	for index := range want {		if got[index] != want[index] {			t.Fatalf("candidateDirs[%d] = %q, want %q", index, got[index], want[index])		}	}} func TestCandidateDirsOmitsEmptyVariant(t *testing.T) {	got := candidateDirs("plugins", "linux", "arm64", "")	want := []string{		filepath.Join("plugins", "linux", "arm64"),		"plugins",	}	if len(got) != len(want) {		t.Fatalf("len(candidateDirs) = %d, want %d", len(got), len(want))	}	for index := range want {		if got[index] != want[index] {			t.Fatalf("candidateDirs[%d] = %q, want %q", index, got[index], want[index])		}	}} func TestSelectPluginFilesFiltersInvalidIDAndDeduplicatesByID(t *testing.T) {	root := t.TempDir()	archDir := filepath.Join(root, runtime.GOOS, runtime.GOARCH)	if errMkdirAll := os.MkdirAll(archDir, 0o755); errMkdirAll != nil {		t.Fatalf("MkdirAll() error = %v", errMkdirAll)	} 	paths := []string{		filepath.Join(root, "sample.so"),		filepath.Join(archDir, "sample.so"),		filepath.Join(archDir, "bad name.so"),		filepath.Join(archDir, "-bad.so"),		filepath.Join(archDir, "another.SO"),		filepath.Join(archDir, "ignored.txt"),	}	for _, path := range paths {		if errWriteFile := os.WriteFile(path, []byte("x"), 0o644); errWriteFile != nil {			t.Fatalf("WriteFile(%s) error = %v", path, errWriteFile)		}	}	if errMkdir := os.Mkdir(filepath.Join(archDir, "dir.so"), 0o755); errMkdir != nil {		t.Fatalf("Mkdir() error = %v", errMkdir)	} 	files, errSelect := selectPluginFiles(root)	if errSelect != nil {		t.Fatalf("selectPluginFiles() error = %v", errSelect)	} 	want := []pluginFile{		{ID: "another", Path: filepath.Join(archDir, "another.SO")},		{ID: "sample", Path: filepath.Join(archDir, "sample.so")},	}	if len(files) != len(want) {		t.Fatalf("selectPluginFiles() = %v, want %v", files, want)	}	for index := range want {		if files[index] != want[index] {			t.Fatalf("selectPluginFiles()[%d] = %v, want %v", index, files[index], want[index])		}	}} func TestSelectPluginFilesPrefersPlatformDirOverRootFallback(t *testing.T) {	root := t.TempDir()	archDir := filepath.Join(root, runtime.GOOS, runtime.GOARCH)	if errMkdirAll := os.MkdirAll(archDir, 0o755); errMkdirAll != nil {		t.Fatalf("MkdirAll() error = %v", errMkdirAll)	} 	platformPath := filepath.Join(archDir, "alpha.so")	rootPath := filepath.Join(root, "alpha.so")	for _, path := range []string{rootPath, platformPath} {		if errWriteFile := os.WriteFile(path, []byte("x"), 0o644); errWriteFile != nil {			t.Fatalf("WriteFile(%s) error = %v", path, errWriteFile)		}	} 	files, errSelect := selectPluginFiles(root)	if errSelect != nil {		t.Fatalf("selectPluginFiles() error = %v", errSelect)	}	if len(files) != 1 {		t.Fatalf("selectPluginFiles() = %v, want exactly one alpha plugin", files)	}	if files[0] != (pluginFile{ID: "alpha", Path: platformPath}) {		t.Fatalf("selectPluginFiles()[0] = %v, want platform plugin %s", files[0], platformPath)	}} func TestDiscoverPluginFilesReturnsSelectedPluginFiles(t *testing.T) {	root := makePluginDir(t, "alpha") 	files, errDiscover := DiscoverPluginFiles(root)	if errDiscover != nil {		t.Fatalf("DiscoverPluginFiles() error = %v", errDiscover)	} 	if len(files) != 1 || files[0].ID != "alpha" || files[0].Path == "" {		t.Fatalf("DiscoverPluginFiles() = %#v, want alpha file", files)	}} func TestSelectPluginFilesPrefersCPUVariantOverGenericArchDir(t *testing.T) {	variant := cpuVariant()	if variant == "" {		t.Skip("current GOARCH has no plugin CPU variant")	}	root := t.TempDir()	archDir := filepath.Join(root, runtime.GOOS, runtime.GOARCH)	variantDir := filepath.Join(root, runtime.GOOS, runtime.GOARCH+"-"+variant)	for _, dir := range []string{archDir, variantDir} {		if errMkdirAll := os.MkdirAll(dir, 0o755); errMkdirAll != nil {			t.Fatalf("MkdirAll(%s) error = %v", dir, errMkdirAll)		}	} 	genericPath := filepath.Join(archDir, "alpha.so")	variantPath := filepath.Join(variantDir, "alpha.so")	for _, path := range []string{genericPath, variantPath} {		if errWriteFile := os.WriteFile(path, []byte("x"), 0o644); errWriteFile != nil {			t.Fatalf("WriteFile(%s) error = %v", path, errWriteFile)		}	} 	files, errSelect := selectPluginFiles(root)	if errSelect != nil {		t.Fatalf("selectPluginFiles() error = %v", errSelect)	}	if len(files) != 1 {		t.Fatalf("selectPluginFiles() = %v, want exactly one alpha plugin", files)	}	if files[0] != (pluginFile{ID: "alpha", Path: variantPath}) {		t.Fatalf("selectPluginFiles()[0] = %v, want CPU variant plugin %s", files[0], variantPath)	}}