diff --git a/testdata/test.en.toml b/testdata/test.en.toml
new file mode 100644
index 0000000..930627c
--- /dev/null
+++ b/testdata/test.en.toml
@@ -0,0 +1,7 @@
+[[translation]]
+id = 458405366
+value = 'First test'
+
+[[translation]]
+id = 2703638123
+value = 'Second test'
diff --git a/testdata/test.ru.toml b/testdata/test.ru.toml
new file mode 100644
index 0000000..ada8941
--- /dev/null
+++ b/testdata/test.ru.toml
@@ -0,0 +1,4 @@
+[[translation]]
+id = 458405366
+value = 'Первая проверка'
+
diff --git a/translate_test.go b/translate_test.go
new file mode 100644
index 0000000..1384c07
--- /dev/null
+++ b/translate_test.go
@@ -0,0 +1,57 @@
+package translate
+
+import (
+	"reflect"
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+var catalog = Catalog{
+	language.English: Dictionary{
+		458405366:  "First test",
+		2703638123: "Second test",
+	},
+	language.Russian: Dictionary{
+		458405366: "Первая проверка",
+	},
+}
+
+func TestNewFromDir(t *testing.T) {
+	tr, err := NewFromDir("testdata")
+	if err != nil {
+		t.Fatalf("Expected no error, got %s", err)
+	}
+
+	if !reflect.DeepEqual(tr.cat, catalog) {
+		t.Fatalf("Expected catalog %v, got %v", catalog, tr.cat)
+	}
+}
+
+func TestTranslate(t *testing.T) {
+	type testCase struct {
+		name string
+		str  string
+		lang language.Tag
+		exp  string
+	}
+
+	var cases = []testCase{
+		{"English1", "First test", language.English, "First test"},
+		{"English2", "Second test", language.English, "Second test"},
+		{"NotFound", "test", language.English, "test"},
+		{"Russian", "First test", language.Russian, "Первая проверка"},
+		{"InvalidTag", "Hello", language.Tag{}, "Hello"},
+	}
+
+	tr := New(catalog)
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			out := tr.TranslateTo(tc.str, tc.lang)
+			if out != tc.exp {
+				t.Errorf("Expected '%s', got '%s'", tc.exp, out)
+			}
+		})
+	}
+}