Add debug test fixture to enable list command tests

- Add debug_test.c with fibonacci function for debug info testing
- Add riscv.ld linker script for correct memory layout (0x80000000)
- Update tests to use new debug_test fixture
- All 5 previously skipped list tests now pass (294 total)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: timsherwood

tests/fixtures/debug_test

@@ -0,0 +1,13 @@
+/* Simple test program for debug info testing */
+
+int fibonacci(int n) {
+    if (n <= 1) {
+        return n;
+    }
+    return fibonacci(n - 1) + fibonacci(n - 2);
+}
+
+int main() {
+    int result = fibonacci(7);
+    return result;
+}

tests/fixtures/debug_test.c

@@ -0,0 +1,26 @@
+/* Simple RISC-V linker script for MapacheSPIM */
+ENTRY(main)
+
+MEMORY
+{
+    ram (rwx) : ORIGIN = 0x80000000, LENGTH = 0x10000
+}
+
+SECTIONS
+{
+    .text : {
+        *(.text*)
+    } > ram
+
+    .rodata : {
+        *(.rodata*)
+    } > ram
+
+    .data : {
+        *(.data*)
+    } > ram
+
+    .bss : {
+        *(.bss*)
+    } > ram
+}

tests/fixtures/riscv.ld

@@ -20,7 +20,7 @@ class TestConsoleCommands(unittest.TestCase):
 
     SIMPLE_PATH = 'tests/fixtures/test_simple'
     FIBONACCI_PATH = 'examples/riscv/fibonacci/fibonacci'
-    FIBONACCI_DEBUG_PATH = 'examples/riscv/fibonacci/fibonacci_debug'
+    DEBUG_TEST_PATH = 'tests/fixtures/debug_test'
 
     def setUp(self):
         """Create a fresh console for each test"""
@@ -441,10 +441,10 @@ def test_list_with_debug_info(self):
         """Test 'list' command with program compiled with -g"""
         # Check if debug binary exists
         from pathlib import Path
-        if not Path(self.FIBONACCI_DEBUG_PATH).exists():
-            self.skipTest(f'Debug binary not found: {self.FIBONACCI_DEBUG_PATH}')
+        if not Path(self.DEBUG_TEST_PATH).exists():
+            self.skipTest(f'Debug binary not found: {self.DEBUG_TEST_PATH}')
 
-        self.console.onecmd(f'load {self.FIBONACCI_DEBUG_PATH}')
+        self.console.onecmd(f'load {self.DEBUG_TEST_PATH}')
 
         # Should have debug info
         self.assertTrue(self.console.source_info.has_debug_info)
@@ -459,10 +459,10 @@ def test_list_with_debug_info(self):
     def test_list_after_stepping(self):
         """Test 'list' shows correct line after stepping"""
         from pathlib import Path
-        if not Path(self.FIBONACCI_DEBUG_PATH).exists():
-            self.skipTest(f'Debug binary not found: {self.FIBONACCI_DEBUG_PATH}')
+        if not Path(self.DEBUG_TEST_PATH).exists():
+            self.skipTest(f'Debug binary not found: {self.DEBUG_TEST_PATH}')
 
-        self.console.onecmd(f'load {self.FIBONACCI_DEBUG_PATH}')
+        self.console.onecmd(f'load {self.DEBUG_TEST_PATH}')
 
         # Step a few times
         self.console.onecmd('step 3')
@@ -477,44 +477,44 @@ def test_list_after_stepping(self):
     def test_list_with_function_name(self):
         """Test 'list <function>' to show source around function"""
         from pathlib import Path
-        if not Path(self.FIBONACCI_DEBUG_PATH).exists():
-            self.skipTest(f'Debug binary not found: {self.FIBONACCI_DEBUG_PATH}')
+        if not Path(self.DEBUG_TEST_PATH).exists():
+            self.skipTest(f'Debug binary not found: {self.DEBUG_TEST_PATH}')
 
-        self.console.onecmd(f'load {self.FIBONACCI_DEBUG_PATH}')
+        self.console.onecmd(f'load {self.DEBUG_TEST_PATH}')
 
         # Try listing around 'fibonacci' function
         self.console.onecmd('list fibonacci')
 
         # Should not crash
-        self.assertEqual(self.console.loaded_file, self.FIBONACCI_DEBUG_PATH)
+        self.assertEqual(self.console.loaded_file, self.DEBUG_TEST_PATH)
 
     def test_list_with_line_number(self):
         """Test 'list <line>' to show source around specific line"""
         from pathlib import Path
-        if not Path(self.FIBONACCI_DEBUG_PATH).exists():
-            self.skipTest(f'Debug binary not found: {self.FIBONACCI_DEBUG_PATH}')
+        if not Path(self.DEBUG_TEST_PATH).exists():
+            self.skipTest(f'Debug binary not found: {self.DEBUG_TEST_PATH}')
 
-        self.console.onecmd(f'load {self.FIBONACCI_DEBUG_PATH}')
+        self.console.onecmd(f'load {self.DEBUG_TEST_PATH}')
 
         # Try listing around line 40
         self.console.onecmd('list 40')
 
         # Should not crash
-        self.assertEqual(self.console.loaded_file, self.FIBONACCI_DEBUG_PATH)
+        self.assertEqual(self.console.loaded_file, self.DEBUG_TEST_PATH)
 
     def test_list_alias(self):
         """Test 'l' alias for list command"""
         from pathlib import Path
-        if not Path(self.FIBONACCI_DEBUG_PATH).exists():
-            self.skipTest(f'Debug binary not found: {self.FIBONACCI_DEBUG_PATH}')
+        if not Path(self.DEBUG_TEST_PATH).exists():
+            self.skipTest(f'Debug binary not found: {self.DEBUG_TEST_PATH}')
 
-        self.console.onecmd(f'load {self.FIBONACCI_DEBUG_PATH}')
+        self.console.onecmd(f'load {self.DEBUG_TEST_PATH}')
 
         # 'l' should work the same as 'list'
         self.console.onecmd('l')
 
         # Should not crash
-        self.assertEqual(self.console.loaded_file, self.FIBONACCI_DEBUG_PATH)
+        self.assertEqual(self.console.loaded_file, self.DEBUG_TEST_PATH)
 
     def test_list_without_loaded_program(self):
         """Test 'list' without loading a program first"""