chore: add test

Author: juliapampus

artifacts/src/test/java/org/eclipse/dsp/schema/negotiation/PolicySchemaTest.java

@@ -29,6 +29,7 @@ void verifySchema() {
         assertThat(schema.validate(POLICY_STRING_PROFILE, JSON)).isEmpty();
         assertThat(schema.validate(POLICY_ARRAY_PROFILE, JSON)).isEmpty();
         assertThat(schema.validate(POLICY_PERMISSION_DUTY, JSON)).isEmpty();
+        assertThat(schema.validate(POLICY_PROHIBITION_DUTY, JSON)).isEmpty();
         assertThat(schema.validate(POLICY_OR_CONSTRAINT, JSON)).isEmpty();
         assertThat(schema.validate(POLICY_AND_CONSTRAINT, JSON)).isEmpty();
         assertThat(schema.validate(POLICY_AND_SEQUENCE_CONSTRAINT, JSON)).isEmpty();
@@ -129,6 +130,32 @@ void setUp() {
               ]
             }""";
 
+    private static final String POLICY_PROHIBITION_DUTY = """
+            {
+              "@id": "urn:uuid:3dd1add8-4d2d-569e-d634-8394a8836a88",
+              "@type": "Offer",
+              "target": "asset:1",
+              "profile": ["https://test.com/profile"],
+              "prohibition": [
+                {
+                  "action": "use",
+                  "constraint": [{
+                      "leftOperand": "partner",
+                      "operator": "eq",
+                      "rightOperand": "gold"
+                  }],
+                  "duty": [{
+                    "action": "report",
+                    "constraint": [{
+                          "leftOperand": "event",
+                          "operator": "gt",
+                          "rightOperand": "use"
+                    }]
+                  }]
+                }
+              ]
+            }""";
+
 
     private static final String POLICY_OR_CONSTRAINT = """
             {