test/alloc: add zpos-2x-fail

test/meson.build

@@ -30,6 +30,7 @@ tests = {
 		'simple-1x',
 		'simple-1x-fail',
 		'simple-3x',
+		'zpos-2x-fail',
 		'zpos-3x',
 		'zpos-3x-intersect-fail',
 		'zpos-3x-intersect-partial',

test/test_alloc.c

@@ -123,6 +123,25 @@ static struct test_case tests[] = {
 			},
 		},
 	},
+	{
+		.name = "zpos-2x-fail",
+		.layers = {
+			{
+				.width = 100,
+				.height = 100,
+				.zpos = 1,
+				.compat = { CURSOR_PLANE },
+				.result = NULL,
+			},
+			{
+				.width = 1920,
+				.height = 1080,
+				.zpos = 2,
+				.compat = { PRIMARY_PLANE },
+				.result = PRIMARY_PLANE,
+			},
+		},
+	},
 	{
 		.name = "zpos-3x",
 		.layers = {