[SHIBUI-660]

Added simple test to check for index writer hashmap usage.
Scope appears to be as intended!

backend/src/test/groovy/edu/internet2/tier/shibboleth/admin/ui/service/IndexWriterServiceTests.groovy

@@ -0,0 +1,37 @@
+package edu.internet2.tier.shibboleth.admin.ui.service
+
+import edu.internet2.tier.shibboleth.admin.ui.configuration.CoreShibUiConfiguration
+import edu.internet2.tier.shibboleth.admin.ui.configuration.InternationalizationConfiguration
+import edu.internet2.tier.shibboleth.admin.ui.configuration.SearchConfiguration
+import edu.internet2.tier.shibboleth.admin.ui.configuration.TestConfiguration
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.autoconfigure.domain.EntityScan
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest
+import org.springframework.data.jpa.repository.config.EnableJpaRepositories
+import org.springframework.test.context.ContextConfiguration
+import spock.lang.Specification
+
+/**
+ * @author Bill Smith (wsmith@unicon.net)
+ */
+@DataJpaTest
+@ContextConfiguration(classes=[CoreShibUiConfiguration, SearchConfiguration, TestConfiguration, InternationalizationConfiguration])
+@EnableJpaRepositories(basePackages = ["edu.internet2.tier.shibboleth.admin.ui"])
+@EntityScan("edu.internet2.tier.shibboleth.admin.ui")
+class IndexWriterServiceTests extends Specification {
+
+    @Autowired
+    IndexWriterService service
+
+    def "retrieving index writer for the same resource id multiple times results in the same index writer being returned"() {
+        given:
+        def resourceId = "12345"
+
+        when:
+        def firstIndexWriter = service.getIndexWriter(resourceId) // causes new index writer to be created and added to map
+        def secondIndexWriter = service.getIndexWriter(resourceId) // retrieves the same index writer from above
+
+        then:
+        firstIndexWriter == secondIndexWriter
+    }
+}