added another unit test to exercise the coordinate calculation bug

@@ -30,7 +30,6 @@
 								  WithLocation:initialCenter];
 	NSLog(@"contentView %@ mapView %@", contentView, mapView);
 	[contentView addSubview:mapView];
-	[NSThread sleepForTimeInterval:3.0];
 }
 
 -(void)tearDown {
@@ -83,27 +82,28 @@
 - (void)testMarkerCreation
 {
 	CLLocationCoordinate2D markerPosition;
-#define kNumberRows 1
-#define kNumberColumns 5
-#define kSpacing 2.0
+	NSUInteger nRows = 1;
+	NSUInteger nColumns = 8;
+	double columnSpacing = 2.0;
 	
 	UIImage *markerImage = [UIImage imageNamed:@"marker-red.png"];
-	STAssertNotNil(markerImage, @"marker image did not load");
-	markerPosition.latitude = initialCenter.latitude - ((kNumberRows - 1)/2.0 * kSpacing);
+	STAssertNotNil(markerImage, @"testMarkerCreation marker image did not load");
+	markerPosition.latitude = initialCenter.latitude - ((nRows - 1)/2.0 * columnSpacing);
 	int i, j;
-	for (i = 0; i < kNumberRows; i++) {
-		markerPosition.longitude = initialCenter.longitude - ((kNumberColumns - 1)/2.0 * kSpacing);
-		for (j = 0; j < kNumberColumns; j++) {
-			markerPosition.longitude += kSpacing;
+	for (i = 0; i < nRows; i++) {
+		markerPosition.longitude = initialCenter.longitude - ((nColumns - 1)/2.0 * columnSpacing);
+		for (j = 0; j < nColumns; j++) {
+			markerPosition.longitude += columnSpacing;
 			NSLog(@"%f %f", markerPosition.latitude, markerPosition.longitude);
 			RMMarker *newMarker = [[RMMarker alloc] initWithUIImage:markerImage];
+			STAssertNotNil(newMarker, @"testMarkerCreation marker creation failed");
 #ifdef DEBUG
 			[newMarker setLatlon:markerPosition];
 #endif
 			[mapView.contents.markerManager addMarker:newMarker
 			 AtLatLong:markerPosition];
 		}
-		markerPosition.latitude += kSpacing;
+		markerPosition.latitude += columnSpacing;
 	}
 	
 #ifdef DEBUG
@@ -116,6 +116,48 @@
 			  screenPosition.y, screenPosition.x);
 	}
 #endif
+}
+
+- (void)testMarkerCoordinates
+{
+	CLLocationCoordinate2D markerPosition;
+	
+	NSUInteger nColumns = 8;
+	double columnSpacing = 2.0;
+
+	UIImage *markerImage = [UIImage imageNamed:@"marker-red.png"];
+	markerPosition.latitude = initialCenter.latitude;
+	markerPosition.longitude = initialCenter.longitude - ((nColumns - 1)/2.0 * columnSpacing);
+	int j;
+	NSMutableArray *testMarkers = [NSMutableArray arrayWithCapacity:nColumns];
+	for (j = 0; j < nColumns; j++) {
+		markerPosition.longitude += columnSpacing;
+		NSLog(@"%f %f", markerPosition.latitude, markerPosition.longitude);
+		RMMarker *newMarker = [[RMMarker alloc] initWithUIImage:markerImage];
+		[testMarkers addObject:newMarker];
+#ifdef DEBUG
+		[newMarker setLatlon:markerPosition];
+#endif
+		[mapView.contents.markerManager addMarker:newMarker
+		 AtLatLong:markerPosition];
+	}
+	STAssertGreaterThan(columnSpacing, 0.0, @"this test requires positive columnSpacing");
+#ifdef DEBUG
+	RMMarkerManager *mangler = [[mapView contents] markerManager];
+	
+	[[mapView contents] moveBy:CGSizeMake(-5.0, 0.0)];
+	for (j = 1; j < nColumns; j++) {
+		RMMarker *leftMarker = [testMarkers objectAtIndex:j - 1];
+		RMMarker *rightMarker = [testMarkers objectAtIndex:j];
+		CGPoint leftScreenPosition = [mangler getMarkerScreenCoordinate:leftMarker];
+		CGPoint rightScreenPosition = [mangler getMarkerScreenCoordinate:rightMarker];
+		STAssertLessThan(leftScreenPosition.x, rightScreenPosition.x, 
+						 @"screen position calculation failed: left (%f, %f) right (%f, %f) mapped to left (%f, %f) right (%f, %f)",
+						 leftMarker.latlon.longitude, leftMarker.latlon.latitude,
+						 rightMarker.latlon.longitude, rightMarker.latlon.latitude,
+						 leftScreenPosition.x, leftScreenPosition.y, rightScreenPosition.x, rightScreenPosition.y);
+	}
+#endif
 	
 }
 @end