test: Check ROM size

test/features/bugs.feature

@@ -18,6 +18,7 @@ Feature: Fixing issues
       """
     When I build test.asm
     And file test.rom exists
+    And file test.rom size is 48k
     Then page 0 has no cartridge header
     And page 1 has cartridge header
     And sym contains INIT
@@ -31,6 +32,7 @@ Feature: Fixing issues
       """
     When I build test.asm
     Then file test.rom exists
+    And file test.rom size is 512k
 
     Given I write the code to test.asm
       """

test/features/program.feature

@@ -57,3 +57,35 @@ Feature: Test program functions
     When I build test.asm
     Then text file contains Hello ASMSX
     And text file does not contain unknown assembler
+
+  # START and ROM directives have different behaviours
+  # depending if you put them after or before PAGE 1
+  Scenario: Expected ROM file size (#121) - 8k
+    Given I write the code to test.asm
+      """
+      ZILOG
+      BIOS
+      PAGE 1
+      START MAIN
+      ROM
+      MAIN:
+        ld  A,1
+      """
+    When I build test.asm
+    Then file test.rom exists
+    And file test.rom size is 8k
+
+  Scenario: Expected ROM file size (#121) - 24k
+    Given I write the code to test.asm
+      """
+      ZILOG
+      BIOS
+      START MAIN
+      ROM
+      PAGE 1
+      MAIN:
+        ld  A,1
+      """
+    When I build test.asm
+    Then file test.rom exists
+    And file test.rom size is 24k

test/steps/build.py

@@ -18,6 +18,24 @@ def step_impl(context, folder):
 def step_impl(context, file):
     assert os.path.isfile(file), f"File {file} does not exist"
 
+def human_size_to_int(size: str) -> int:
+    size = size.lower()
+    if size[-1] == 'k':
+        return int(size[:-1]) * 1024
+    elif size[-1] == 'm':
+        return int(size[:-1]) * 1024 * 1024
+    elif size.isnumeric():
+        return int(size)
+    else:
+        raise("Value not valid")
+
+@step('file {file} size is {size}')
+@step('file size of {file} is {size}')
+def step_impl(context, file, size: str):
+    expected_size = human_size_to_int(size)
+    file_size = os.path.getsize(file)
+    assert file_size == expected_size, f"File {file} has size {file_size} (expected {expected_size})"
+
 @given('I write to {file}')
 @given('I write the code to {file}')
 def step_impl(context, file):