1 files changed, 18 insertions, 0 deletions
diff --git a/platform/darwin/test/MGLStyleTests.mm b/platform/darwin/test/MGLStyleTests.mm
index 0dd6e98c5d..7abc88eebc 100644
--- a/platform/darwin/test/MGLStyleTests.mm
+++ b/platform/darwin/test/MGLStyleTests.mm
@@ -1,5 +1,6 @@
 #import "MGLMapView.h"
 #import "MGLStyle_Private.h"
+#import "MGLOpenGLStyleLayer.h"
 
 #import "MGLShapeSource.h"
 #import "MGLRasterSource.h"
@@ -170,6 +171,23 @@
     XCTAssertThrowsSpecificNamed([self.style addLayer:symbolLayer], NSException, @"MGLRedundantLayerException");
 }
 
+- (void)testAddingLayersWithDuplicateIdentifiers {
+    //Just some source
+    MGLVectorSource *source = [[MGLVectorSource alloc] initWithIdentifier:@"my-source" URL:[NSURL URLWithString:@"mapbox://mapbox.mapbox-terrain-v2"]];
+    [self.mapView.style addSource: source];
+    
+    //Add initial layer
+    MGLFillStyleLayer *initial = [[MGLFillStyleLayer alloc] initWithIdentifier:@"my-layer" source:source];
+    [self.mapView.style addLayer:initial];
+    
+    //Try to add the duplicate
+    XCTAssertThrowsSpecificNamed([self.mapView.style addLayer:[[MGLFillStyleLayer alloc] initWithIdentifier:@"my-layer" source:source]], NSException, @"MGLRedundantLayerIdentifierException");
+    XCTAssertThrowsSpecificNamed([self.mapView.style insertLayer:[[MGLFillStyleLayer alloc] initWithIdentifier:@"my-layer" source:source] belowLayer:initial],NSException, @"MGLRedundantLayerIdentifierException");
+    XCTAssertThrowsSpecificNamed([self.mapView.style insertLayer:[[MGLFillStyleLayer alloc] initWithIdentifier:@"my-layer" source:source] aboveLayer:initial], NSException, @"MGLRedundantLayerIdentifierException");
+    XCTAssertThrowsSpecificNamed([self.mapView.style insertLayer:[[MGLFillStyleLayer alloc] initWithIdentifier:@"my-layer" source:source] atIndex:0], NSException, @"MGLRedundantLayerIdentifierException");
+    XCTAssertThrowsSpecificNamed([self.mapView.style insertLayer:[[MGLOpenGLStyleLayer alloc] initWithIdentifier:@"my-layer"] atIndex:0], NSException, @"MGLRedundantLayerIdentifierException");
+}
+
 - (NSString *)stringWithContentsOfStyleHeader {
     NSURL *styleHeaderURL = [[[NSBundle mgl_frameworkBundle].bundleURL
                               URLByAppendingPathComponent:@"Headers" isDirectory:YES]