Unable to start process in unit test

Thank you very much Ingo. It was exactly the solution. It works with:

Here is the configuration OK for my Unit test:

<bean id="processEngineConfiguration" class="org.camunda.bpm.engine.impl.cfg.StandaloneInMemProcessEngineConfiguration">
<!-- <bean id="processEngineConfiguration" class="org.camunda.bpm.extension.process_test_coverage.junit.rules.ProcessCoverageInMemProcessEngineConfiguration"> -->
            <property name="history" value="audit" />
            <property name="databaseSchemaUpdate" value="true" />
            <property name="jobExecutorActivate" value="false" />
            <property name="defaultSerializationFormat" value="application/json" />
            <!--<property name="expressionManager">
                <bean class="org.camunda.bpm.engine.test.mock.MockExpressionManager" />
            </property>-->
            <!-- engine plugins -->
			<property name="processEnginePlugins">
			  <list>
				<!--<ref bean="connectProcessEnginePlugin" />-->
				<ref bean="spinProcessEnginePlugin" />
			  </list>
			</property>
			<!-- <property name="idGenerator">
				<bean class="org.camunda.bpm.engine.impl.persistence.StrongUuidGenerator"/>
			</property> -->
    </bean>
    <!-- engine plugin beans -->
    <!--  <bean id="connectProcessEnginePlugin" class="org.camunda.connect.plugin.impl.ConnectProcessEnginePlugin" /> -->
    <bean id="spinProcessEnginePlugin" class="org.camunda.spin.plugin.impl.SpinProcessEnginePlugin" />

</beans>