How can I ignore some JSON and object properties during unit testing?

Question

I have a method that is migrating old JSON structure to a new one that I would like to test, but there is one randomly generated property (UUID) that I would like to ignore.

The interesting part of the object looks like this:

val expected = FooterContainer(id = UUID.fromString("11914145-9775-4675-9c65-54bbd369fb2c"), title = null, flowType=ContainerType.ROWS, elements=listOf() //the rest is not important.

The JSON to be converted looks totally different from this object, but this is the purpose of the method - to convert it to a new model.

val json = """[{"type": "list", "items": [{"link": "www.something.com", "type": "link", "label": "Some label"},
            {"type": "text", "label": "Another label"}, {"type": "text", "label": "Other label"},
            {"type": "text", "label": "yet another label"}, {"type": "text", "label": "[email protected]"}]

et cetera.

The below code worked as expected:

val gson: JsonElement = Gson().fromJson(json, JsonElement::class.java)

    // when
    val converted = with(ClientDataRepository()) {
        gson.readFooter()
    }

until I had to introduce a new field in FooterContainer object, which was val id: UUID

The method readFooter() is generating the UUID randomly, which is an expected behaviour.

But now, I cannot just assign a random (or hardcoded, as in the example code above) UUID to the expected class, which is logical - two randomly generated UUIDs will never be the same.

when I run the test, I obviously get:

Expected :FooterContainer(id=11914145-9775-4675-9c65-54bbd369fb2c,
Actual   :FooterContainer(id=7ba39ad0-1412-4fda-a827-0241916f8558,

Now, is there a possibility to ignore the id field for this test? It is not important from the test perspective, but the rest is.

Alex · Accepted Answer · 2021-08-03 09:48:35Z

2

Try JsonUnit. In this case you can modify your code in next way:

assertThatJson("{\"id\":${json-unit.ignore}}").isEqualTo("{\"id\": 11914145-9775-4675-9c65-54bbd369fb2c}");

answered Aug 3, 2021 at 9:48

Alex

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Mafor · Accepted Answer · 2020-08-13 13:45:05Z

1

You can simply copy the id field from the actual object to the expected:

val converted = with(ClientDataRepository()) {
    gson.readFooter()
}

val expected = FooterContainer(id = converted.id, title = null, flowType=ContainerType.ROWS, elements=listOf()) //the rest is not important.
Assertions.assertThat(converted).isEqualTo(expected);

If you are using assertJ, there is a stright forward solution:

Assertions.assertThat(converted).isEqualToIgnoringGivenFields(expected, "id")

edited Aug 13, 2020 at 13:45

answered Aug 13, 2020 at 13:39

Mafor

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Tom · Accepted Answer · 2020-08-12 10:49:55Z

0

You can use something like json-assert (https://github.com/skyscreamer/JSONassert) that support ignoring keys - https://stackoverflow.com/a/44328139/4473822

answered Aug 12, 2020 at 10:49

Tom

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