Fix Issue #168: typo in build method

src/BuildStage.groovy

@@ -29,7 +29,7 @@ class BuildStage implements Stage, TerraformEnvironmentStagePlugin {
     }
 
     public void build() {
-        Jenkinsflie.build(pipelineConfiguration())
+        Jenkinsfile.build(pipelineConfiguration())
     }
 
     @Override
@@ -44,7 +44,7 @@ class BuildStage implements Stage, TerraformEnvironmentStagePlugin {
         }
     }
 
-    private Closure pipelineConfiguration() {
+    protected Closure pipelineConfiguration() {
         applyPlugins()
 
         return {

test/BuildStageTest.groovy

@@ -0,0 +1,23 @@
+import org.junit.*
+import org.junit.runner.RunWith
+import de.bechte.junit.runners.context.HierarchicalContextRunner
+
+import static org.mockito.Mockito.verify
+import static org.mockito.Mockito.when
+import static org.mockito.Mockito.spy
+import static org.mockito.Mockito.doReturn
+
+@RunWith(HierarchicalContextRunner.class)
+class BuildStageTest {
+
+    public class Build {
+        @Test
+        void buildsWithoutError() {
+            BuildStage stage = spy(new BuildStage())
+
+            doReturn({ -> }).when(stage).pipelineConfiguration()
+
+            stage.build()
+        }
+    }
+}