Fix test and use a stub rather than a real Workflow instance.

Author: uhafner

src/test/java/io/jenkins/plugins/forensics/util/ScmResolverTest.java

@@ -1,13 +1,11 @@
 package io.jenkins.plugins.forensics.util;
 
 import java.io.IOException;
-import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 
 import org.assertj.core.api.ObjectAssert;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition;
@@ -16,7 +14,6 @@
 import hudson.EnvVars;
 import hudson.model.AbstractBuild;
 import hudson.model.AbstractProject;
-import hudson.model.ItemGroup;
 import hudson.model.Job;
 import hudson.model.Run;
 import hudson.model.TaskListener;
@@ -118,14 +115,18 @@ private SCM createScm(final String key) {
         return first;
     }
 
-    @Disabled("TODO rewrite to use JenkinsRule, not Mockito")
     @Test
-    void shouldResolveScmForPipelineWithFlowNode() throws IOException {
-        WorkflowJob pipeline = createPipeline();
-        pipeline.setDefinition(createCpsFlowDefinition());
+    void shouldResolveScmForPipelineWithFlowNode() {
+        var pipeline = mock(WorkflowJob.class);
 
-        Run<?, ?> run = createRunFor(pipeline);
-        assertThatScmOf(run).isInstanceOf(SCM.class);
+        var empty = createRunFor(pipeline);
+        assertThatScmOf(empty).isInstanceOf(NullSCM.class);
+
+        var flowDefinition = createCpsFlowDefinition();
+        when(pipeline.getDefinition()).thenReturn(flowDefinition);
+
+        var withScmFromFlowDefinition = createRunFor(pipeline);
+        assertThatScmOf(withScmFromFlowDefinition).isInstanceOf(SCM.class);
     }
 
     private CpsScmFlowDefinition createCpsFlowDefinition() {
@@ -135,14 +136,6 @@ private CpsScmFlowDefinition createCpsFlowDefinition() {
         return flowDefinition;
     }
 
-    private WorkflowJob createPipeline() throws IOException {
-        ItemGroup<?> group = mock(ItemGroup.class);
-        WorkflowJob pipeline = new WorkflowJob(group, "stub");
-        when(group.getRootDirFor(any())).thenReturn(Files.createTempFile("", "").toFile());
-        when(group.getFullName()).thenReturn("bla");
-        return pipeline;
-    }
-
     @Test
     void shouldCreateNullBlamerForPipelineWithNoScm() {
         Job<?, ?> pipeline = mock(Job.class, withSettings().extraInterfaces(SCMTriggerItem.class));