1 files changed, 23 insertions, 0 deletions
diff --git a/tests/drivers/memory_limits_test.py b/tests/drivers/memory_limits_test.py
new file mode 100644
index 0000000..a973480
--- /dev/null
+++ b/tests/drivers/memory_limits_test.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+# focused host memory configuration and growth checks.
+import os
+import subprocess
+
+source = '''fn main() {
+ int initial = syscall(9, 0, 0, 0);
+ put_n(syscall(9, 5, initial, 0) == initial); put_c(32);
+ put_n(syscall(9, 4, initial + 4096, 0) == -1); put_c(32);
+ put_n(syscall(9, 5, initial + 8192, 0) == initial + 8192); put_c(32);
+ put_n(syscall(9, 4, initial + 4096, 0) == initial + 4096); put_c(32);
+ put_n(syscall(9, 5, initial - 1, 0) == -1); put_c(10);
+ return 0;
+}
+'''
+commands = [['bin/zy'], ['bin/zym'], ['node', 'src/js/tinyvm.js']]
+environment = dict(os.environ, TINYVM_MAX_MEMORY_WORDS='16777216')
+for command in commands:
+    result = subprocess.run(command, input=source, text=True, capture_output=True, env=environment, timeout=15)
+    assert result.returncode == 0 and result.stdout == '1 1 1 1 1\n', (command, result.stdout, result.stderr)
+    invalid = subprocess.run(command, input=source, text=True, capture_output=True, env=dict(environment, TINYVM_MEMORY_WORDS='1'), timeout=15)
+    assert invalid.returncode != 0 and invalid.stderr, (command, invalid.stdout)
+    print('ok   runtime memory limits, denied growth, successful growth, and invalid startup: ' + command[0])