unit test for key generator

src/test/groovy/grails/plugin/cache/CustomCacheKeyGeneratorSpec.groovy

@@ -0,0 +1,41 @@
+package grails.plugin.cache
+
+import spock.lang.Specification
+import spock.lang.Unroll
+
+class CustomCacheKeyGeneratorSpec extends Specification {
+
+    void 'test matching keys'() {
+
+        given:
+        CustomCacheKeyGenerator keyGenerator = new CustomCacheKeyGenerator()
+
+        when:
+        Serializable key1 = keyGenerator.generate('TestService', 'method', 0, [ arg1: 1, arg2: 2 ])
+        Serializable key2 = keyGenerator.generate('TestService', 'method', 0, [ arg1: 1, arg2: 2 ])
+
+        then:
+        key1.hashCode() == key2.hashCode()
+    }
+
+    @Unroll('#className::#methodName(#params) should not match TestService::method([arg1: 1, arg2: 2])')
+    void 'test differing keys'() {
+
+        given:
+        CustomCacheKeyGenerator keyGenerator = new CustomCacheKeyGenerator()
+        Serializable key1 = keyGenerator.generate('TestService', 'method', 0, [ arg1: 1, arg2: 2 ])
+
+        when:
+        Serializable key2 = keyGenerator.generate(className, methodName, 0, params)
+
+        then:
+        key1.hashCode() != key2.hashCode()
+
+        where:
+        className | methodName | params
+        'TestService' | 'method' | [ arg1: 1, arg2: 3 ]
+        'TestService' | 'method' | [ arg1: 1, _arg2: 2 ]
+        'TestService' | '_method' | [ arg1: 1, arg2: 2 ]
+        '_TestService' | 'method' | [ arg1: 1, arg2: 2 ]
+    }
+}