Add test case for duplicate key

Tests/OptimizelyTests-DataModel/ProjectConfigTests.swift

@@ -79,7 +79,70 @@ class ProjectConfigTests: XCTestCase {
         XCTAssertEqual(featureMap["1003"], ["2002"])
         XCTAssertEqual(featureMap["1004"], ["2002"])
     }
-
+
+	func testProjectConfigWithDuplicateKey() {
+		let exp0: [String : Any] = [
+			"id": "10001",
+			"key": "duplicate_key",
+			"status": "Running",
+			"layerId": "22222",
+			"variations": [],
+			"trafficAllocation": [],
+			"audienceIds": ["33333"],
+			"audienceConditions": [],
+			"forcedVariations": ["12345": "1234567890"]
+		]
+
+		let exp1: [String : Any] = [
+			"id": "10005",
+			"key": "duplicate_key",
+			"status": "Running",
+			"layerId": "22222",
+			"variations": [],
+			"trafficAllocation": [],
+			"audienceIds": ["33333"],
+			"audienceConditions": [],
+			"forcedVariations": ["12345": "1234567890"]
+		]
+
+		var projectData: [String: Any] = [
+			"version": "4",
+			"projectId": "11111",
+			"experiments": [],
+			"audiences": [],
+			"groups": [],
+			"attributes": [],
+			"accountId": "1234567890",
+			"events": [],
+			"revision": "5",
+			"anonymizeIP": true,
+			"rollouts": [],
+			"typedAudiences": [],
+			"integrations": [],
+			"featureFlags": [],
+			"botFiltering": false,
+			"sendFlagDecisions": true
+		]
+
+		projectData["experiments"] = [exp0, exp1]
+		let model: Project = try! OTUtils.model(from: projectData)
+		let projectConfig = ProjectConfig()
+		projectConfig.project = model
+
+		optimizely = OptimizelyClient(
+			sdkKey: "demo_key",
+			logger: _TestLogger()
+		)
+
+		optimizely.config = projectConfig
+
+		let optimizelyExpMap: [String: OptimizelyExperiment] = try! optimizely.getOptimizelyConfig().experimentsMap
+
+		XCTAssertEqual(optimizelyExpMap.count, 1)
+		XCTAssertEqual(optimizelyExpMap["duplicate_key"]?.id, "10005")
+	}
+
+
     func testFlagVariations() {
         let datafile = OTUtils.loadJSONDatafile("decide_datafile")!
         let optimizely = OptimizelyClient(sdkKey: "12345",