Add test for scripted pipeline job with string parameter

- Should demonstrate problem with default com.lesfurets.jenkins.unit.BasePipelineTest.stringInterceptor

src/test/groovy/com/lesfurets/jenkins/TestWithParametersJob.groovy

@@ -0,0 +1,39 @@
+package com.lesfurets.jenkins
+
+import com.lesfurets.jenkins.unit.BaseRegressionTest
+import org.junit.Before
+import org.junit.Test
+
+class TestWithParametersJob extends BaseRegressionTest {
+
+    @Override
+    @Before
+    void setUp() throws Exception {
+        scriptRoots += 'src/test/jenkins'
+        super.setUp()
+    }
+
+    @Test
+    void should_run_script_with_parameters() {
+        // TODO: Must override default from com/lesfurets/jenkins/unit/BasePipelineTest.groovy:214
+        //   because com.lesfurets.jenkins.unit.BasePipelineTest.stringInterceptor seems to return null!?
+        helper.registerAllowedMethod("string", [Map], { Map map ->
+            return map
+        })
+
+        helper.registerAllowedMethod("parameters", [List], { List params ->
+            params.forEach { param ->
+                if (param instanceof Map) {
+                    addParam(param.name as String, param.defaultValue, false)
+                }
+            }
+        })
+
+        // when:
+        runScript("job/withParameters.jenkins")
+
+        // then:
+        assertJobStatusSuccess()
+        testNonRegression("withParameters")
+    }
+}

src/test/jenkins/job/withParameters.jenkins

@@ -0,0 +1,7 @@
+properties([
+    parameters([
+        string(name: 'my_param', defaultValue: 'my default value', description: 'My parameter')
+  ])
+])
+
+echo("'my_param' value is default: ${params.my_param}")

src/test/resources/callstacks/TestWithParametersJob_withParameters.txt

@@ -0,0 +1,5 @@
+   withParameters.run()
+      withParameters.string({name=my_param, defaultValue=my default value, description=My parameter})
+      withParameters.parameters([{name=my_param, defaultValue=my default value, description=My parameter}])
+      withParameters.properties([null])
+      withParameters.echo('my_param' value is default: my default value)