Throw exception for invalid plan name

src/main/java/com/purbon/kafka/topology/serdes/TopicCustomDeserializer.java

@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.databind.deser.std.StdDeserializer;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.purbon.kafka.topology.Configuration;
+import com.purbon.kafka.topology.exceptions.TopologyParsingException;
 import com.purbon.kafka.topology.exceptions.ValidationException;
 import com.purbon.kafka.topology.model.PlanMap;
 import com.purbon.kafka.topology.model.SubjectNameStrategy;
@@ -85,10 +86,10 @@ public Topic deserialize(JsonParser parser, DeserializationContext context) thro
             Map<String, String> planConfigObject = plans.get(planLabel).getConfig();
             planConfigObject.forEach(config::putIfAbsent);
           } else {
-            LOGGER.warn(planLabel + " is missing in the plans definition. It will be ignored.");
+            throw new TopologyParsingException(
+                "Topic \"" + name "\" references non-existing plan \"" + planLabel + "\"");
           }
         });
-
     Topic topic = new Topic(name, producers, consumers, optionalDataType, config, this.config);
 
     Optional<SubjectNameStrategy> subjectNameStrategy =

src/test/java/com/purbon/kafka/topology/TopologyObjectBuilderTest.java

@@ -146,6 +146,13 @@ public void testTopologyWithPlansButWithNoPlansDef() throws IOException {
     TopologyObjectBuilder.build(descriptorFile);
   }
 
+  @Test(expected = TopologyParsingException.class)
+  public void testTopologyWithInvalidPlan() throws IOException {
+    String descriptorFile = TestUtils.getResourceFilename("/descriptor-with-invalid-plan.yaml");
+    String plansFile = TestUtils.getResourceFilename("/plans.yaml");
+    TopologyObjectBuilder.build(descriptorFile, plansFile);
+  }
+
   @Test(expected = TopologyParsingException.class)
   public void testInvalidTopology() throws IOException {
     String descriptorFile =

src/test/resources/descriptor-with-invalid-plan.yaml

@@ -0,0 +1,10 @@
+---
+context: "contextOrg"
+source: "source"
+projects:
+  - name: "foo"
+    topics:
+      - name: "fooBar"
+        plan: "gold"
+      - name: "barFoo"
+        plan: "invalid-plan-name"