diff --git a/tests/ert/unit_tests/scheduler/test_openpbs_driver.py b/tests/ert/unit_tests/scheduler/test_openpbs_driver.py
index 1f07366138b..a14e7975c11 100644
--- a/tests/ert/unit_tests/scheduler/test_openpbs_driver.py
+++ b/tests/ert/unit_tests/scheduler/test_openpbs_driver.py
@@ -140,7 +140,7 @@ def parse_resource_string(qsub_args: str) -> dict[str, str]:
 async def test_realization_memory():
     driver = OpenPBSDriver()
     await driver.submit(0, "sleep", realization_memory=1024**2)
-    assert " -l mem=1gb" in Path("captured_qsub_args").read_text(encoding="utf-8")
+    assert " -l mem=1mb" in Path("captured_qsub_args").read_text(encoding="utf-8")
 
 
 @pytest.mark.usefixtures("capturing_qsub")
@@ -151,11 +151,11 @@ async def test_no_default_realization_memory():
 
 
 @pytest.mark.usefixtures("capturing_qsub")
-async def test_no_validation_of_realization_memory():
+async def test_realization_memory_not_negative():
     # Validation will happen during config parsing
     driver = OpenPBSDriver()
-    await driver.submit(0, realization_memory="a_lot")
-    assert " -l mem=a_lot" in Path("captured_qsub_args").read_text(encoding="utf-8")
+    await driver.submit(0, "sleep", realization_memory=-1)
+    assert " -l " not in Path("captured_qsub_args").read_text(encoding="utf-8")
 
 
 @pytest.mark.usefixtures("capturing_qsub")
@@ -261,7 +261,7 @@ async def started(iens):
     assert was_started == started_expected
 
 
-@given(words, st.integers(min_value=1), words)
+@given(st.integers(), st.integers(min_value=1), words)
 @pytest.mark.usefixtures("capturing_qsub")
 async def test_full_resource_string(realization_memory, num_cpu, cluster_label):
     driver = OpenPBSDriver(