Don't repeatedly unparse node.test

.. it's not needed.

circuitpython_build_tools/munge.py

@@ -90,14 +90,15 @@ def process_statement(node):
                         break
                 return
         elif isinstance(node, ast.If):
+            node_test = ast.unparse(node.test)
             # return the statements in the 'if' branch of 'if sys.implementation...: ...'
-            if ast.unparse(node.test) == sys_implementation_is_circuitpython:
+            if node_test == sys_implementation_is_circuitpython:
                 replace(node.lineno, 'if 1:')
             # return the statements in the 'else' branch of 'if sys.implementation...: ...'
-            if ast.unparse(node.test) == sys_implementation_not_circuitpython or ast.unparse(node.test) == sys_implementation_not_circuitpython2:
+            elif node_test == sys_implementation_not_circuitpython or node_test == sys_implementation_not_circuitpython2:
                 replace(node.lineno, 'if 0:')
             # return the statements in the else branch of 'if TYPE_CHECKING: ...'
-            elif ast.unparse(node.test) == 'TYPE_CHECKING':
+            elif node_test == 'TYPE_CHECKING':
                 replace(node.lineno, 'if 0:')
         elif isinstance(node, ast.Assign) and isinstance(node.targets[0], ast.Name) and node.targets[0].id == '__version__':
                 replace(node.lineno, f"__version__ = \"{version_str}\"")

tests/test_munge.py

@@ -14,9 +14,9 @@ def test_munge(test_path):
     result_content = munge(test_path, "1.2.3")
     result_path.write_text(result_content, encoding="utf-8")
 
-    expected = test_path.with_suffix(".exp")
-    expected_content = expected.read_text(encoding="utf-8")
+    expected_path = test_path.with_suffix(".exp")
+    expected_content = expected_path.read_text(encoding="utf-8")
 
-    assert result == expected
+    assert result_content == expected_content
 
     result_path.unlink()