1 files changed, 96 insertions, 0 deletions
diff --git a/dec/dec_test.go b/dec/dec_test.go
new file mode 100644
index 0000000..823ab68
--- /dev/null
+++ b/dec/dec_test.go
@@ -0,0 +1,96 @@
+package main
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"roseh.moe/cmd/sym/internal/sym"
+)
+
+func mustWriteFile(t *testing.T, path string, content []byte) {
+	t.Helper()
+	if err := os.WriteFile(path, content, 0600); err != nil {
+		t.Fatalf("Failed to write test file: %s", err)
+	}
+}
+
+func mustReadFile(t *testing.T, path string) []byte {
+	t.Helper()
+	content, err := os.ReadFile(path)
+	if err != nil {
+		t.Fatalf("Failed to read file: %s", err)
+	}
+	return content
+}
+
+func mustRemove(t *testing.T, path string) {
+	t.Helper()
+	if err := os.Remove(path); err != nil {
+		t.Fatalf("Failed to remove file: %s", err)
+	}
+}
+
+func TestDec(t *testing.T) {
+	t.Parallel()
+
+	const password = "asdf"
+	fileContent := []byte("test file content")
+	fileName := filepath.Join(t.TempDir(), "file")
+	mustWriteFile(t, fileName, fileContent)
+	if err := sym.EncryptFile(fileName, password); err != nil {
+		t.Errorf("EncryptFile failed: %s", err)
+	}
+	mustRemove(t, fileName)
+	err := (&options{password: password}).dec(fileName + ".enc")
+	if err != nil {
+		t.Errorf("dec failed: %s", err)
+	}
+	gotFileContents := mustReadFile(t, fileName)
+	if !bytes.Equal(gotFileContents, fileContent) {
+		t.Errorf("dec returned incorrect contents %q, want %q", gotFileContents, fileContent)
+	}
+}
+
+func TestDec_UsageError(t *testing.T) {
+	t.Parallel()
+
+	err := (&options{}).dec()
+	if err == nil {
+		t.Errorf("dec without -p when reading from stdin, want error")
+	}
+}
+
+func TestDec_NotFound(t *testing.T) {
+	t.Parallel()
+
+	err := (&options{password: "asdf"}).dec("my-nonexistent-file-name.txt")
+	if err == nil {
+		t.Errorf("dec succeeded with nonexistent file, want error")
+	}
+}
+
+func TestDec_Stdin(t *testing.T) {
+	t.Parallel()
+
+	const password = "asdf"
+	content := []byte("test contents")
+	encrypted := new(bytes.Buffer)
+	if err := sym.EncryptBinary(encrypted, bytes.NewReader(content), password); err != nil {
+		t.Fatalf("Failed to encrypt: %s", err)
+	}
+	gotContentBuf := new(bytes.Buffer)
+	opts := &options{
+		password: password,
+		stdin:    bytes.NewReader(encrypted.Bytes()),
+		stdout:   gotContentBuf,
+	}
+	if err := opts.dec(); err != nil {
+		t.Fatalf("dec failed: %s", err)
+	}
+	gotContent := gotContentBuf.Bytes()
+	if !bytes.Equal(gotContent, content) {
+		t.Errorf("dec returned incorrect contents %q, want %q", gotContent, content)
+	}
+}