minimal test of generating a whole programm (that can be linked and run,yeah)

test/helper.rb

@@ -29,3 +29,4 @@ $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'lib'))
 $LOAD_PATH.unshift(File.join(File.dirname(__FILE__), '..', 'test'))
 
 require 'crystal'
+require 'asm/object_writer'

test/small_program_test.rb

@@ -0,0 +1,32 @@
+require_relative 'helper'
+require "asm/arm/code_generator"
+
+# try  to test that the generation of basic instructions works
+# one instruction at a time, reverse testing from objdump --demangle -Sfghxp
+# tests are named as per assembler code, ie test_mov testing mov instruction
+#  adc add and bic eor orr rsb rsc sbc sub mov mvn cmn cmp teq tst b bl bx swi strb
+
+class TestSmallProg < MiniTest::Test
+  # need a code generator, for arm 
+  def setup
+    @generator = Asm::Arm::CodeGenerator.new
+  end
+
+  def test_generate_small
+    @generator.instance_eval {
+      mov r0, 5                #1
+      loop_start = label
+      loop_start.set!
+      subs r0, r0, 1          #2
+      bne loop_start          #3
+    	mov r7, 1               #4
+    	swi 0                   #5  5 instruction x 4 == 20
+    }
+
+    writer = Asm::ObjectWriter.new(Elf::Constants::TARGET_ARM)
+    assembly = @generator.assemble
+    assert_equal 20 , assembly.length 
+    writer.set_text assembly
+    writer.save('small_test.o')    
+  end
+end