1 files changed, 25 insertions, 0 deletions
diff --git a/tests/drivers/image_growth_test.py b/tests/drivers/image_growth_test.py
new file mode 100644
index 0000000..064eae7
--- /dev/null
+++ b/tests/drivers/image_growth_test.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+# image output can grow past its first buffer and the building host's genome slot.
+import pathlib
+import subprocess
+import sys
+
+root = pathlib.Path(__file__).resolve().parents[2]
+source = '''fn main() {
+ int retained = 7;
+ int n = build_image_grow(GORG, 8);
+ gc();
+ put_n(n > FBOT - GORG); put_c(32);
+ put_n(image_size == n && image_words[6] == GORG + n); put_c(32);
+ put_n(image_words[5] > GORG && image_words[5] < image_words[6]); put_c(32);
+ put_n(retained); put_c(10);
+ return 0;
+}
+`'''
+source += (root / 'src/runtime/rt.zc').read_text()
+source += (root / 'src/runtime/run.zc').read_text()
+source += 'let padding[350000]; fn main() { return padding[349999]; }\n'
+result = subprocess.run(sys.argv[1:], input=source, capture_output=True, text=True, timeout=40)
+assert result.returncode == 0, (result.stdout, result.stderr)
+assert result.stdout == '1 1 1 7\n', result.stdout[:1000]
+print('ok   growing image output keeps logical addresses and older frames intact')