diff --git a/.tests/parse/file/testfiles/header_invalid_description_type.json b/.tests/parse/file/testfiles/header_invalid_description_type.json
new file mode 100644
index 0000000..ca52c7c
--- /dev/null
+++ b/.tests/parse/file/testfiles/header_invalid_description_type.json
@@ -0,0 +1,16 @@
+{
+	"name": "A castle",
+	"description": 88,
+	"size": {
+		"x": 50,
+		"y": 25,
+		"z": 75
+	},
+	"offset": {
+		"x": 3,
+		"y": 0,
+		"z": 5
+	},
+	"type": "full",
+	"generator": "WorldEditAdditions v1.14"
+}
\ No newline at end of file
diff --git a/.tests/parse/file/testfiles/header_invalid_no_offset.json b/.tests/parse/file/testfiles/header_invalid_no_offset.json
new file mode 100644
index 0000000..800471c
--- /dev/null
+++ b/.tests/parse/file/testfiles/header_invalid_no_offset.json
@@ -0,0 +1,10 @@
+{
+	"name": "A castle",
+	"size": {
+		"x": 50,
+		"y": 25,
+		"z": 75
+	},
+	"type": "full",
+	"generator": "WorldEditAdditions v1.14"
+}
\ No newline at end of file
diff --git a/.tests/parse/file/testfiles/header_invalid_no_size.json b/.tests/parse/file/testfiles/header_invalid_no_size.json
new file mode 100644
index 0000000..21a56bc
--- /dev/null
+++ b/.tests/parse/file/testfiles/header_invalid_no_size.json
@@ -0,0 +1,10 @@
+{
+	"name": "A castle",
+	"offset": {
+		"x": 50,
+		"y": 25,
+		"z": 75
+	},
+	"type": "full",
+	"generator": "WorldEditAdditions v1.14"
+}
\ No newline at end of file
diff --git a/.tests/parse/file/weaschem_header.test.lua b/.tests/parse/file/weaschem_header.test.lua
index e5b8703..42a2c50 100644
--- a/.tests/parse/file/weaschem_header.test.lua
+++ b/.tests/parse/file/weaschem_header.test.lua
@@ -63,5 +63,31 @@ describe("parse.file.weaschem.parse_header", function()
 		assert.are.same("HEADER_NAME_INVALID", code)
 		assert.are.same("string", type(result))
 	end)
+	it("should complain for an invalid header with description of wrong type", function()
+		local content = get_json_string("invalid_description_type")
+		assert.are_not.same(nil, content)
+		local success, code, result = weaschem.parse_header(content)
+		assert.are.same(false, success)
+		assert.are.same("HEADER_DESCRIPTION_INVALID", code)
+		assert.are.same("string", type(result))
+	end)
+	it("should complain for an invalid header with no offset", function()
+		local content = get_json_string("invalid_no_offset")
+		assert.are_not.same(nil, content)
+		local success, code, result = weaschem.parse_header(content)
+		assert.are.same(false, success)
+		assert.are.same("HEADER_NO_OFFSET", code)
+		assert.are.same("string", type(result))
+	end)
+	it("should complain for an invalid header with no size", function()
+		local content = get_json_string("invalid_no_size")
+		assert.are_not.same(nil, content)
+		local success, code, result = weaschem.parse_header(content)
+		assert.are.same(false, success)
+		assert.are.same("HEADER_NO_SIZE", code)
+		assert.are.same("string", type(result))
+	end)
+	
+	-- TODO: Test invalid sizes/offsets, but this is mainly handled by the above
 end)