Adding federation tag directive to ignore

src/main/resources/federation_built_in_directives.graphqls

@@ -6,3 +6,4 @@ directive @external on FIELD_DEFINITION
 directive @provides(fields: String!) on FIELD_DEFINITION
 directive @requires(fields: _FieldSet!) on FIELD_DEFINITION
 
+directive @tag(name: String!) repeatable on FIELD_DEFINITION | INTERFACE | OBJECT | UNION | ARGUMENT_DEFINITION | SCALAR | ENUM | ENUM_VALUE | INPUT_OBJECT | INPUT_FIELD_DEFINITION

src/test/groovy/com/intuit/graphql/orchestrator/federationdirectives/ignoredDirectives/IgnoredDirectiveSpec.groovy

@@ -0,0 +1,42 @@
+package com.intuit.graphql.orchestrator.federationdirectives.ignoredDirectives
+
+import com.intuit.graphql.orchestrator.ServiceProvider
+import com.intuit.graphql.orchestrator.schema.RuntimeGraph
+import com.intuit.graphql.orchestrator.stitching.SchemaStitcher
+import graphql.schema.GraphQLFieldDefinition
+import helpers.BaseIntegrationTestSpecification
+
+class IgnoredDirectiveSpec  extends BaseIntegrationTestSpecification {
+    def "Successful stitching fields with tags"() {
+        given:
+        String SCHEMA_WITH_TAGS = '''
+        type Query {
+            multipleTagField(id: String): String @tag(name: "tag1") @tag(name: "tag2")
+            singleTagField: String @tag(name: "soloTag")                 
+            noTagField: String                 
+        }
+        '''
+
+        ServiceProvider tagProvider = createQueryMatchingService("TAG_SERVICE_PROVIDER",
+                ServiceProvider.ServiceType.FEDERATION_SUBGRAPH, SCHEMA_WITH_TAGS, null)
+        List<ServiceProvider> services = List.of(tagProvider)
+
+        when:
+        RuntimeGraph actualRuntimeGraph = SchemaStitcher.newBuilder()
+                .services(services).build().stitchGraph()
+
+        then:
+        actualRuntimeGraph != null
+        actualRuntimeGraph.addtionalDirectives.stream().anyMatch { it -> it.name == "tag" }
+        GraphQLFieldDefinition multipleTagGqlDef = actualRuntimeGraph.executableSchema.queryType.getFieldDefinition("multipleTagField")
+        multipleTagGqlDef.directives.size() == 2
+        multipleTagGqlDef.getDirectives().get(0).getArgument("name").argumentValue.getValue() == "tag1"
+        multipleTagGqlDef.getDirectives().get(1).getArgument("name").argumentValue.getValue() == "tag2"
+
+        GraphQLFieldDefinition singleTagGqlDef = actualRuntimeGraph.executableSchema.queryType.getFieldDefinition("singleTagField")
+        singleTagGqlDef.directives.size() == 1
+        singleTagGqlDef.getDirectives().get(0).getArgument("name").argumentValue.getValue() == "soloTag"
+
+        actualRuntimeGraph.executableSchema.queryType.getFieldDefinition("noTagField").directives.size() == 0
+    }
+}