From 4ae3edf3008b70e20663143553a736d80ff3a501 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Fri, 25 Aug 2023 12:37:27 +0300
Subject: gh-108418: Speed up bigmem compression tests in dry mode (GH-108419)

Only generate and compress small amount of random data in dry run.
---
 Lib/test/test_bz2.py  | 4 ++--
 Lib/test/test_lzma.py | 4 ++--
 Lib/test/test_zlib.py | 4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/Lib/test/test_bz2.py b/Lib/test/test_bz2.py
index e4dd7fc..1f0b9ad 100644
--- a/Lib/test/test_bz2.py
+++ b/Lib/test/test_bz2.py
@@ -721,10 +721,10 @@ class BZ2DecompressorTest(BaseTest):
     @bigmemtest(size=_4G + 100, memuse=3.3)
     def testDecompress4G(self, size):
         # "Test BZ2Decompressor.decompress() with >4GiB input"
-        blocksize = 10 * 1024 * 1024
+        blocksize = min(10 * 1024 * 1024, size)
         block = random.randbytes(blocksize)
         try:
-            data = block * (size // blocksize + 1)
+            data = block * ((size-1) // blocksize + 1)
             compressed = bz2.compress(data)
             bz2d = BZ2Decompressor()
             decompressed = bz2d.decompress(compressed)
diff --git a/Lib/test/test_lzma.py b/Lib/test/test_lzma.py
index ac53bdd..13b2009 100644
--- a/Lib/test/test_lzma.py
+++ b/Lib/test/test_lzma.py
@@ -352,10 +352,10 @@ class CompressorDecompressorTestCase(unittest.TestCase):
     @bigmemtest(size=_4G + 100, memuse=3)
     def test_decompressor_bigmem(self, size):
         lzd = LZMADecompressor()
-        blocksize = 10 * 1024 * 1024
+        blocksize = min(10 * 1024 * 1024, size)
         block = random.randbytes(blocksize)
         try:
-            input = block * (size // blocksize + 1)
+            input = block * ((size-1) // blocksize + 1)
             cdata = lzma.compress(input)
             ddata = lzd.decompress(cdata)
             self.assertEqual(ddata, input)
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
index 2113757..55306c6 100644
--- a/Lib/test/test_zlib.py
+++ b/Lib/test/test_zlib.py
@@ -989,10 +989,10 @@ class ZlibDecompressorTest(unittest.TestCase):
     @bigmemtest(size=_4G + 100, memuse=3.3)
     def testDecompress4G(self, size):
         # "Test zlib._ZlibDecompressor.decompress() with >4GiB input"
-        blocksize = 10 * 1024 * 1024
+        blocksize = min(10 * 1024 * 1024, size)
         block = random.randbytes(blocksize)
         try:
-            data = block * (size // blocksize + 1)
+            data = block * ((size-1) // blocksize + 1)
             compressed = zlib.compress(data)
             zlibd = zlib._ZlibDecompressor()
             decompressed = zlibd.decompress(compressed)
-- 
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