1 files changed, 85 insertions, 0 deletions
diff --git a/internal/testsuite/fs_test.go b/internal/testsuite/fs_test.go
new file mode 100644
index 00000000..4eea866d
--- /dev/null
+++ b/internal/testsuite/fs_test.go
@@ -0,0 +1,85 @@
+package testsuite_test
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io/fs"
+	"testing"
+	"testing/fstest"
+
+	"hakurei.app/internal/testsuite"
+)
+
+func TestCompare(t *testing.T) {
+	var (
+		fsPasswdSample = "u0_a20:x:65534:65534:Hakurei:/var/lib/persist/module/hakurei/u0/a20:/run/current-system/sw/bin/zsh"
+		fsGroupSample  = "hakurei:x:65534:"
+	)
+
+	testCases := []struct {
+		name string
+
+		sample  fstest.MapFS
+		want    *testsuite.FS
+		wantOut string
+		wantErr error
+	}{
+		{"skip", fstest.MapFS{}, &testsuite.FS{}, "[ OK ] s .\x00", nil},
+		{"simple pass", fstest.MapFS{".hakurei": {Mode: 0x800001ed}},
+			&testsuite.FS{Dir: map[string]*testsuite.FS{".hakurei": {Mode: 0x800001ed}}},
+			"[ OK ] s .hakurei\x00[ OK ] d .\x00", nil},
+		{"bad length", fstest.MapFS{".hakurei": {Mode: 0x800001ed}},
+			&testsuite.FS{Dir: make(map[string]*testsuite.FS)},
+			"[FAIL] d .: \".hakurei/\"\x00", testsuite.ErrFSBadLength},
+		{"top level bad mode", fstest.MapFS{".hakurei": {Mode: 0x800001ed}},
+			&testsuite.FS{Dir: map[string]*testsuite.FS{".hakurei": {Mode: 0xdeadbeef}}},
+			"[FAIL] m .hakurei: 020000000755, want 033653337357\x00", testsuite.ErrFSBadMode},
+		{"invalid entry condition", fstest.MapFS{"test": {Data: []byte{'0'}, Mode: 0644}},
+			&testsuite.FS{Dir: map[string]*testsuite.FS{"test": {Dir: make(map[string]*testsuite.FS)}}},
+			"[FAIL] d .: \"test\"\x00", testsuite.ErrFSInvalidEnt},
+		{"nonexistent", fstest.MapFS{"test": {Data: []byte{'0'}, Mode: 0644}},
+			&testsuite.FS{Dir: map[string]*testsuite.FS{".test": {}}},
+			"[FAIL] d .: \"test\"\x00", fs.ErrNotExist},
+		{"file", fstest.MapFS{"etc": {Mode: 0x800001c0},
+			"etc/passwd": {Data: []byte(fsPasswdSample), Mode: 0644},
+			"etc/group":  {Data: []byte(fsGroupSample), Mode: 0644},
+		}, &testsuite.FS{Dir: map[string]*testsuite.FS{"etc": {Mode: 0x800001c0, Dir: map[string]*testsuite.FS{
+			"passwd": {Mode: 0x1a4, Data: &fsPasswdSample},
+			"group":  {Mode: 0x1a4, Data: &fsGroupSample},
+		}}}}, "[ OK ] f etc/group\x00[ OK ] f etc/passwd\x00[ OK ] d etc\x00[ OK ] d .\x00", nil},
+		{"file differ", fstest.MapFS{"etc": {Mode: 0x800001c0},
+			"etc/passwd": {Data: []byte(fsPasswdSample), Mode: 0644},
+			"etc/group":  {Data: []byte(fsGroupSample), Mode: 0644},
+		}, &testsuite.FS{Dir: map[string]*testsuite.FS{"etc": {Mode: 0x800001c0, Dir: map[string]*testsuite.FS{
+			"passwd": {Mode: 0x1a4, Data: &fsGroupSample},
+			"group":  {Mode: 0x1a4, Data: &fsGroupSample},
+		}}}}, "[ OK ] f etc/group\x00[FAIL] f etc/passwd\n\t got: u0_a20:x:65534:65534:Hakurei:/var/lib/persist/module/hakurei/u0/a20:/run/current-system/sw/bin/zsh\n\twant: hakurei:x:65534:\x00", testsuite.ErrFSBadData},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			var buf bytes.Buffer
+
+			err := tc.want.Compare(
+				func(format string, a ...any) {
+					_, _ = fmt.Fprintf(&buf, format+"\x00", a...)
+				},
+				".", tc.sample,
+			)
+			if !errors.Is(err, tc.wantErr) {
+				t.Errorf(
+					"Compare: error = %v; wantErr %v",
+					err, tc.wantErr,
+				)
+			}
+
+			if buf.String() != tc.wantOut {
+				t.Errorf(
+					"Compare: output %q; want %q",
+					&buf, tc.wantOut,
+				)
+			}
+		})
+	}
+}