diff --git a/.tests/parse/file/testfiles/parse_valid_delta.weaschem b/.tests/parse/file/testfiles/parse_valid_delta.weaschem
new file mode 100644
index 0000000..64ce036
--- /dev/null
+++ b/.tests/parse/file/testfiles/parse_valid_delta.weaschem
@@ -0,0 +1,7 @@
+WEASCHEM 1
+{"name":"Test schematic","description": "Some description","size":{"x":5,"y":3,"z":4},"offset":{"x":1,"y":0,"z":2},"type":"delta","generator": "WorldEditAdditions v1.14"}
+{"0":"default:air","5":"default:stone","14":"default:dirt"}
+10x5,40x14,0,5,14,5,-1,5x0
+10x0,1,0,2x1,0,5x0,40x1
+10x5,40x-2,0,5,14,5,14,5x0
+10x0,1,0,2x1,0,5x0,40x1
\ No newline at end of file
diff --git a/.tests/parse/file/weaschem_parse.test.lua b/.tests/parse/file/weaschem_parse.test.lua
index c9fce2f..d12cbdb 100644
--- a/.tests/parse/file/weaschem_parse.test.lua
+++ b/.tests/parse/file/weaschem_parse.test.lua
@@ -99,4 +99,68 @@ describe("parse.file.weaschem.parse", function()
 		assert.are.same("UNEXPECTED_TOKEN", code)
 		assert.are.same("string", type(result))
 	end)
+	
+	it("should parse a valid delta file", function()
+		local handle = make_handle("valid_delta")
+		
+		local success, code, result = weaschem.parse(handle)
+		
+		print("DEBUG:parse", inspect(result))
+		
+		assert.are.same(true, success)
+		assert.are.same("SUCCESS", code)
+		assert.are.same("table", type(result))
+		assert.are.same({
+			id_map = {
+				[0] = "default:air", [14] = "default:dirt", [5] = "default:stone", },
+			header = {
+				offset = {
+					y = 0, x = 1, z = 2, },
+				type = "delta",
+				description = "Some description",
+				generator = "WorldEditAdditions v1.14",
+				name = "Test schematic",
+				size = {
+					y = 3, x = 5, z = 4, }
+			},
+			data_tables = {
+				data_prev = {
+					[1] = 5, [2] = 5, [3] = 5, [4] = 5, [5] = 5, [6] = 5, [7] = 5, [8] = 5, [9] = 5, [10] = 14,
+					[11] = 14, [12] = 14, [13] = 14, [14] = 14, [15] = 14, [16] = 14, [17] = 14, [18] = 14, [19] = 14,
+					[20] = 14, [21] = 14, [22] = 14, [23] = 14, [24] = 14, [25] = 14, [26] = 14, [27] = 14, [28] = 14,
+					[29] = 14, [30] = 14, [31] = 14, [32] = 14, [33] = 14, [34] = 14, [35] = 14, [36] = 14, [37] = 14,
+					[38] = 14, [39] = 14, [40] = 14, [41] = 14, [42] = 14, [43] = 14, [44] = 14, [45] = 14, [46] = 14,
+					[47] = 14, [48] = 14, [49] = 14, [50] = 0, [51] = 5, [52] = 14, [53] = 5, [54] = -1, [55] = 0,
+					[56] = 0, [57] = 0, [58] = 0, [59] = 0, [0] = 5
+				},
+				data_current = {
+					[1] = 5, [2] = 5, [3] = 5, [4] = 5, [5] = 5, [6] = 5, [7] = 5, [8] = 5, [9] = 5, [10] = -2,
+					[11] = -2, [12] = -2, [13] = -2, [14] = -2, [15] = -2, [16] = -2, [17] = -2, [18] = -2, [19] = -2,
+					[20] = -2, [21] = -2, [22] = -2, [23] = -2, [24] = -2, [25] = -2, [26] = -2, [27] = -2, [28] = -2,
+					[29] = -2, [30] = -2, [31] = -2, [32] = -2, [33] = -2, [34] = -2, [35] = -2, [36] = -2, [37] = -2,
+					[38] = -2, [39] = -2, [40] = -2, [41] = -2, [42] = -2, [43] = -2, [44] = -2, [45] = -2, [46] = -2,
+					[47] = -2, [48] = -2, [49] = -2, [50] = 0, [51] = 5, [52] = 14, [53] = 5, [54] = 14, [55] = 0,
+					[56] = 0, [57] = 0, [58] = 0, [59] = 0, [0] = 5
+				},
+				param2_prev = {
+					[1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0, [8] = 0, [9] = 0, [10] = 1, [11] = 0,
+					[12] = 1, [13] = 1, [14] = 0, [15] = 0, [16] = 0, [17] = 0, [18] = 0, [19] = 0, [20] = 1, [21] = 1,
+					[22] = 1, [23] = 1, [24] = 1, [25] = 1, [26] = 1, [27] = 1, [28] = 1, [29] = 1, [30] = 1, [31] = 1,
+					[32] = 1, [33] = 1, [34] = 1, [35] = 1, [36] = 1, [37] = 1, [38] = 1, [39] = 1, [40] = 1, [41] = 1,
+					[42] = 1, [43] = 1, [44] = 1, [45] = 1, [46] = 1, [47] = 1, [48] = 1, [49] = 1, [50] = 1, [51] = 1,
+					[52] = 1, [53] = 1, [54] = 1, [55] = 1, [56] = 1, [57] = 1, [58] = 1, [59] = 1, [0] = 0
+				},
+				param2_current = {
+					[1] = 0, [2] = 0, [3] = 0, [4] = 0, [5] = 0, [6] = 0, [7] = 0, [8] = 0, [9] = 0, [10] = 1, [11] = 0,
+					[12] = 1, [13] = 1, [14] = 0, [15] = 0, [16] = 0, [17] = 0, [18] = 0, [19] = 0, [20] = 1, [21] = 1,
+					[22] = 1, [23] = 1, [24] = 1, [25] = 1, [26] = 1, [27] = 1, [28] = 1, [29] = 1, [30] = 1, [31] = 1,
+					[32] = 1, [33] = 1, [34] = 1, [35] = 1, [36] = 1, [37] = 1, [38] = 1, [39] = 1, [40] = 1, [41] = 1,
+					[42] = 1, [43] = 1, [44] = 1, [45] = 1, [46] = 1, [47] = 1, [48] = 1, [49] = 1, [50] = 1, [51] = 1,
+					[52] = 1, [53] = 1, [54] = 1, [55] = 1, [56] = 1, [57] = 1, [58] = 1, [59] = 1, [0] = 0
+				}
+			}
+		}, result)
+		
+		-- TODO: Test delta_which more thoroughly.
+	end)
 end)