### Question:
ResourceCreated extends AbstractPolicyEvent<ResourceCreated> implements PolicyEvent<ResourceCreated> { @Deprecated public static ResourceCreated of(final String policyId, final Label label, final Resource resource, final long revision, final DittoHeaders dittoHeaders) { return of(PolicyId.of(policyId), label, resource, revision, dittoHeaders); } private  ResourceCreated(final PolicyId policyId,
            final Label label,
            final Resource resource,
            final long revision,
            @Nullable final Instant timestamp,
            final DittoHeaders dittoHeaders); @Deprecated static ResourceCreated of(final String policyId,
            final Label label,
            final Resource resource,
            final long revision,
            final DittoHeaders dittoHeaders); static ResourceCreated of(final PolicyId policyId,
            final Label label,
            final Resource resource,
            final long revision,
            final DittoHeaders dittoHeaders); @Deprecated static ResourceCreated of(final String policyId,
            final Label label,
            final Resource resource,
            final long revision,
            @Nullable final Instant timestamp,
            final DittoHeaders dittoHeaders); static ResourceCreated of(final PolicyId policyId,
            final Label label,
            final Resource resource,
            final long revision,
            @Nullable final Instant timestamp,
            final DittoHeaders dittoHeaders); static ResourceCreated fromJson(final String jsonString, final DittoHeaders dittoHeaders); static ResourceCreated fromJson(final JsonObject jsonObject, final DittoHeaders dittoHeaders); Label getLabel(); Resource getResource(); @Override Optional<JsonValue> getEntity(final JsonSchemaVersion schemaVersion); @Override JsonPointer getResourcePath(); @Override ResourceCreated setRevision(final long revision); @Override ResourceCreated setDittoHeaders(final DittoHeaders dittoHeaders); @SuppressWarnings("squid:S109") @Override int hashCode(); @SuppressWarnings("squid:MethodCyclomaticComplexity") @Override boolean equals(@Nullable final Object o); @Override String toString(); static final String NAME; static final String TYPE; static final JsonFieldDefinition<String> JSON_RESOURCE_KEY; }### Answer:
@Test(expected = PolicyIdInvalidException.class) public void tryToCreateInstanceWithNullPolicyIdString() { ResourceCreated.of((String) null, TestConstants.Policy.LABEL, TestConstants.Policy.RESOURCE, TestConstants.Policy.REVISION_NUMBER, TestConstants.EMPTY_DITTO_HEADERS); }
@Test(expected = NullPointerException.class) public void tryToCreateInstanceWithNullPolicyId() { ResourceCreated.of((PolicyId) null, TestConstants.Policy.LABEL, TestConstants.Policy.RESOURCE, TestConstants.Policy.REVISION_NUMBER, TestConstants.EMPTY_DITTO_HEADERS); }
@Test(expected = NullPointerException.class) public void tryToCreateInstanceWithNullLabel() { ResourceCreated.of(TestConstants.Policy.POLICY_ID, null, TestConstants.Policy.RESOURCE, TestConstants.Policy.REVISION_NUMBER, TestConstants.EMPTY_DITTO_HEADERS); }
@Test(expected = NullPointerException.class) public void tryToCreateInstanceWithNullResource() { ResourceCreated.of(TestConstants.Policy.POLICY_ID, TestConstants.Policy.LABEL, null, TestConstants.Policy.REVISION_NUMBER, TestConstants.EMPTY_DITTO_HEADERS); }
@Test public void toJsonReturnsExpected() { final ResourceCreated underTest = ResourceCreated.of(TestConstants.Policy.POLICY_ID, TestConstants.Policy.LABEL, TestConstants.Policy.RESOURCE, TestConstants.Policy.REVISION_NUMBER, TestConstants.TIMESTAMP, TestConstants.EMPTY_DITTO_HEADERS); final JsonObject actualJson = underTest.toJson(FieldType.regularOrSpecial()); assertThat(actualJson).isEqualTo(KNOWN_JSON); }