failing test for #7

Author: robfletcher

test/unit/grails/plugin/gson/serialization/CompositeIdSpec.groovy

@@ -0,0 +1,56 @@
+package grails.plugin.gson.serialization
+
+import com.google.gson.Gson
+import grails.persistence.Entity
+import grails.plugin.gson.GsonFactory
+import grails.test.mixin.Mock
+import spock.lang.*
+
+@Mock(Coordinate)
+class CompositeIdSpec extends Specification {
+
+	Gson gson
+
+	void setup() {
+		gson = new GsonFactory(grailsApplication).createGson()
+	}
+
+	@Issue('https://github.com/robfletcher/grails-gson/issues/7')
+	void 'can deserialize an existing instance with a composite id'() {
+		given:
+		def coord1 = new Coordinate(x: '3.38', y: '-54.43', feature: 'Bouvet Island').save(failOnError: true)
+
+		and:
+		def data = [x: '3.38', y: '-54.43']
+		def json = gson.toJson(data)
+
+		when:
+		def coord2 = gson.fromJson(json, Coordinate)
+
+		then:
+		coord2.x == coord1.x
+		coord2.y == coord1.y
+		coord2.feature == coord1.feature
+	}
+
+	void 'can serialize an instance with a composite id'() {
+		given:
+		def coord = new Coordinate(x: '3.38', y: '-54.43', feature: 'Bouvet Island').save(failOnError: true)
+
+		expect:
+		def json = gson.toJsonTree(coord)
+		json.x.asString == coord.x
+		json.y.asString == coord.y
+	}
+
+}
+
+@Entity
+class Coordinate {
+	String x
+	String y
+	String feature
+	static mapping = {
+		id composite: ['x', 'y']
+	}
+}