Activiti/Activiti#3765 Add Process Runtime coverage for category field (#3785)

* Activiti/Activiti#3765 Add Process Runtime coverage for category field

* Remove redundant null check

* Improve test

* Rearrage test code

* Improve test syntax

activiti-core/activiti-spring-boot-starter/src/test/java/org/activiti/spring/boot/process/ProcessRuntimeIT.java

@@ -24,6 +24,7 @@ import java.math.BigDecimal;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 import org.activiti.api.model.shared.model.VariableInstance;
 import org.activiti.api.process.model.Deployment;
@@ -75,6 +76,7 @@ public class ProcessRuntimeIT {
     private static final String SUPER_PROCESS = "superProcess";
     private static final Pageable PAGEABLE = Pageable.of(0,
         50);
+    public static final String CATEGORIZE_HUMAN_PROCESS_CATEGORY = "test-category";
 
     @Autowired
     private ProcessRuntime processRuntime;
@@ -186,6 +188,20 @@ public class ProcessRuntimeIT {
                         ONE_STEP_PROCESS);
     }
 
+    @Test
+    public void should_allProcessDefinitionsHaveCategoriesSet_when_fetchingProcessDefinitions() {
+        //when
+        List<ProcessDefinition> processDefinitionList = processRuntime.processDefinitions(PAGEABLE)
+            .getContent();
+
+        //then
+        assertThat(processDefinitionList)
+            .extracting(ProcessDefinition::getCategory)
+            .contains(CATEGORIZE_HUMAN_PROCESS_CATEGORY)
+            .allMatch(Objects::nonNull);
+
+    }
+
     @Test
     public void shouldGetAvailableLatestDeployments() {
 

activiti-core/activiti-spring-boot-starter/src/test/resources/processes/categorize-human.bpmn20.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<bpmn:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_0v7t65f" targetNamespace="http://bpmn.io/schema/bpmn">
+<bpmn:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_0v7t65f" targetNamespace="test-category">
   <bpmn:process id="categorizeHumanProcess" name="categorizeHumanProcess" isExecutable="true">
     <bpmn:startEvent id="StartEvent_1">
       <bpmn:outgoing>SequenceFlow_14mnde3</bpmn:outgoing>