fix: fix inconsistent definition of assertError function in maps section (#765)

Author: dario-piotrowicz

maps.md

@@ -363,16 +363,9 @@ func TestAdd(t *testing.T) {
 		assertDefinition(t, dictionary, word, definition)
 	})
 }
-
-func assertError(t testing.TB, got, want error) {
-	t.Helper()
-	if got != want {
-		t.Errorf("got %q want %q", got, want)
-	}
-}
 ```
 
-For this test, we modified `Add` to return an error, which we are validating against a new error variable, `ErrWordExists`. We also modified the previous test to check for a `nil` error, as well as the `assertError` function.
+For this test, we modified `Add` to return an error, which we are validating against a new error variable, `ErrWordExists`. We also modified the previous test to check for a `nil` error.
 
 ## Try to run test
 

maps/v1/dictionary_test.go

@@ -15,6 +15,6 @@ func assertStrings(t testing.TB, got, want string) {
 	t.Helper()
 
 	if got != want {
-		t.Errorf("got %q want %q", got, want)
+		t.Errorf("got error %q want %q", got, want)
 	}
 }