dict: refact test

dictionary/dictionary_test.go

@@ -2,13 +2,19 @@ package dictionary
 
 import "testing"
 
+func assertStrings(t testing.TB, got, want string) {
+    t.Helper()
+
+	if got != want {
+		t.Errorf("got %q want %q given %q", got, want, "test")
+	}
+}
+
 func TestSearch(t *testing.T) {
 	dictionary := map[string]string{"test": "this is just a test"}
 
 	got := Search(dictionary, "test")
 	want := "this is just a test"
 
-	if got != want {
-		t.Errorf("got %q want %q given %q", got, want, "test")
-	}
+    assertStrings(t, got, want)
 }