tests for nested unwrap

Author: PeterIvanov

error_113_test.go

@@ -42,4 +42,31 @@ func TestErrorUnwrap(t *testing.T) {
 		require.NotNil(t, unwrapped)
 		require.True(t, errors.Is(unwrapped, io.EOF))
 	})
-}
+
+	t.Run("Nested", func(t *testing.T) {
+		err := Decorate(Decorate(testType.NewWithNoMessage(), ""), "")
+		unwrapped := errors.Unwrap(err)
+		require.NotNil(t, unwrapped)
+		unwrapped = errors.Unwrap(unwrapped)
+		require.NotNil(t, unwrapped)
+		require.True(t, IsOfType(unwrapped, testType))
+	})
+
+	t.Run("NestedWrapped", func(t *testing.T) {
+		err := Decorate(testTypeBar1.Wrap(testType.NewWithNoMessage(), ""), "")
+		unwrapped := errors.Unwrap(err)
+		require.NotNil(t, unwrapped)
+		require.True(t, IsOfType(unwrapped, testTypeBar1))
+		unwrapped = errors.Unwrap(unwrapped)
+		require.Nil(t, unwrapped)
+	})
+
+	t.Run("NestedForeign", func(t *testing.T) {
+		err := Decorate(Decorate(io.EOF, ""), "")
+		unwrapped := errors.Unwrap(err)
+		require.NotNil(t, unwrapped)
+		unwrapped = errors.Unwrap(unwrapped)
+		require.NotNil(t, unwrapped)
+		require.True(t, errors.Is(unwrapped, io.EOF))
+	})
+}