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In Grails I have a service that I want to unit test. The service uses these imports: import grails.converters.JSON import grails.web.JSONBuilder I want the service to do get data and convert it to JSON: def tables = DataProfileStats.withCriteria { projections { distinct("tableName") } }; The helper method I wrote to build the JSON is: public String buildNodeString(String nodeText) { def builder = new JSONBuilder(); JSON result = builder.build { hello = "world" }; return result.toString(); } In the unit test I have to add @TestMixin(ControllerUnitTestMixin) so the JSON adapter is loaded. But I also have to add @TestMixin(DomainClassUnitTestMixin) so I can mock the database object. Any ideas on how to have multiple @TestMixin or is this a design issue with me having a import grails.web.JSONBuilder in a service class? Otherwise, I have to use a JAVA/JSON library or put the JSON stuff in a controller. This is what I want the test to look like: @TestMixin(ControllerUnitTestMixin) @TestMixin(DomainClassUnitTestMixin) class JsTreeJSONGeneratorServiceTests { void testSomething() { DataProfileStats stats1 = new DataProfileStats(); stats1.tableName = "table"; mockDomain(DataProfileStats, stats1); JsTreeJSONGeneratorService service = new JsTreeJSONGeneratorService(); String json = service.buildNodeString(); assert json != ""; } } I get a @TestMixin(ControllerUnitTestMixin) @TestMixin(DomainClassUnitTestMixin) class JsTreeJSONGeneratorServiceTests { void testSomething() { DataProfileStats stats1 = new DataProfileStats(); stats1.tableName = "table"; mockDomain(DataProfileStats, stats1); JsTreeJSONGeneratorService service = new JsTreeJSONGeneratorService(); String json

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