Add Lua `BlockEncoder` tests

src/rust/iced-x86-lua/tests/block_encoder_spec.lua

@@ -0,0 +1,52 @@
+-- SPDX-License-Identifier: MIT
+-- Copyright (C) 2018-present iced project and contributors
+
+local from_hex = require("iced_test_utils").from_hex
+
+describe("BlockEncoder", function()
+	local BlockEncoder = require("iced_x86.BlockEncoder")
+	local BlockEncoderOptions = require("iced_x86.BlockEncoderOptions")
+	local Decoder = require("iced_x86.Decoder")
+
+	it("encode: empty", function()
+		local result = BlockEncoder.encode(64, {}, 0x12345678)
+		assert.equals("", result.code_buffer)
+	end)
+
+	it("encode: invalid bitness", function()
+		assert.has_error(function()
+			local _ = BlockEncoder.encode(1, {}, 0x12345678)
+		end)
+	end)
+
+	it("encode: with options", function()
+		local decoder = Decoder:new(64, from_hex("72 00"), nil, 0x12345678)
+		local instr = decoder:decode()
+		local result = BlockEncoder.encode(64, { instr }, 0x12345578, BlockEncoderOptions.None)
+		assert.equals(from_hex("0F82 FC000000"), result.code_buffer)
+		assert.has_error(function()
+			local _ = BlockEncoder.encode(64, { instr }, 0x12345578, BlockEncoderOptions.DontFixBranches)
+		end)
+	end)
+
+	it("encode: 16", function()
+		local decoder = Decoder:new(16, from_hex("72 00"), nil, 0x5678)
+		local instr = decoder:decode()
+		local result = BlockEncoder.encode(16, { instr }, 0x5578)
+		assert.equals(from_hex("0F82 FE00"), result.code_buffer)
+	end)
+
+	it("encode: 32", function()
+		local decoder = Decoder:new(32, from_hex("72 00"), nil, 0x12345678)
+		local instr = decoder:decode()
+		local result = BlockEncoder.encode(32, { instr }, 0x12345578)
+		assert.equals(from_hex("0F82 FC000000"), result.code_buffer)
+	end)
+
+	it("encode: 64", function()
+		local decoder = Decoder:new(64, from_hex("72 00"), nil, 0x12345678)
+		local instr = decoder:decode()
+		local result = BlockEncoder.encode(64, { instr }, 0x12345578)
+		assert.equals(from_hex("0F82 FC000000"), result.code_buffer)
+	end)
+end)