[Bugfix] fix flaky test (vllm-project#13089)

Signed-off-by: மனோஜ்குமார் பழனிச்சாமி <smartmanoj42857@gmail.com>
Signed-off-by: SzymonOzog <szymon.ozog@aleph-alpha.com>

tests/test_seed_behavior.py

@@ -8,32 +8,17 @@
 
 
 def test_seed_behavior():
-    # Test with seed=None
-    Platform.seed_everything(None)
+    # Test with a specific seed
+    Platform.seed_everything(42)
     random_value_1 = random.randint(0, 100)
     np_random_value_1 = np.random.randint(0, 100)
     torch_random_value_1 = torch.randint(0, 100, (1, )).item()
 
-    Platform.seed_everything(None)
+    Platform.seed_everything(42)
     random_value_2 = random.randint(0, 100)
     np_random_value_2 = np.random.randint(0, 100)
     torch_random_value_2 = torch.randint(0, 100, (1, )).item()
 
-    assert random_value_1 != random_value_2
-    assert np_random_value_1 != np_random_value_2
-    assert torch_random_value_1 != torch_random_value_2
-
-    # Test with a specific seed
-    Platform.seed_everything(42)
-    random_value_3 = random.randint(0, 100)
-    np_random_value_3 = np.random.randint(0, 100)
-    torch_random_value_3 = torch.randint(0, 100, (1, )).item()
-
-    Platform.seed_everything(42)
-    random_value_4 = random.randint(0, 100)
-    np_random_value_4 = np.random.randint(0, 100)
-    torch_random_value_4 = torch.randint(0, 100, (1, )).item()
-
-    assert random_value_3 == random_value_4
-    assert np_random_value_3 == np_random_value_4
-    assert torch_random_value_3 == torch_random_value_4
+    assert random_value_1 == random_value_2
+    assert np_random_value_1 == np_random_value_2
+    assert torch_random_value_1 == torch_random_value_2