add integration test

test/vaporware/compiler/test_assembler.rb

@@ -0,0 +1,49 @@
+require "vaporware"
+require "test/unit"
+require "tempfile"
+
+class Vaporware::Compiler::Assembler::ELFTest < Test::Unit::TestCase
+  def reference_binary = ""
+
+  def test_to_elf
+    input_file = Tempfile.open(["amd64.s"])
+    input_file.puts <<~AMD64ASM
+  .intel_syntax noprefix
+  .globl main
+main:
+  push rbp
+  mov rbp, rsp
+  sub rsp, 0
+  push 1
+  push 2
+  pop rdi
+  pop rax
+  add rax, rdi
+  push rax
+  push 3
+  pop rdi
+  pop rax
+  imul rax, rdi
+  push rax
+  push 5
+  push 4
+  pop rdi
+  pop rax
+  sub rax, rdi
+  push rax
+  pop rdi
+  pop rax
+  cqo
+  idiv rdi
+  push rax
+  mov rsp, rbp
+  pop rbp
+  ret
+    AMD64ASM
+    input = input_file.path
+
+    assembler = Vaporware::Compiler::Assembler.new(input:, output: "amd64.o")
+    assembler.to_elf
+    binding.irb
+  end
+end