Restore unit test

Author: AlexGuzmanAtAbsa

library/src/test/scala/za/co/absa/springdocopenapiscala/OpenAPIScalaCustomizerSpec.scala

@@ -56,6 +56,17 @@ class OpenAPIScalaCustomizerSpec extends AnyFlatSpec {
 
   behavior of "customise"
 
+  it should "set `components` of its argument OpenAPI object to one injected via DI to the class" in {
+    val components = new Components().addSchemas("a", new Schema)
+    val openAPIScalaCustomizer = new OpenAPIScalaCustomizer(components)
+
+    val openAPI = initializeOpenAPI
+
+    openAPIScalaCustomizer.customise(openAPI)
+
+    assert(openAPI.getComponents === components)
+  }
+
   it should "convert all responses returning Unit (BoxedUnit reference) to empty response" in {
     val components = new Components()
     val openAPIScalaCustomizer = new OpenAPIScalaCustomizer(components)