tests: improve cpu_weight_systemd coverage

The `test_resources_cpu_weight_systemd` function previously
tested the CPU shares update with a single value.

This change expands the test to cover boundary values.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

Author: giuseppe

tests/test_resources.py

@@ -291,24 +291,26 @@ def test_resources_cpu_weight_systemd():
             sys.stderr.write("found wrong CPUWeight for the systemd scope\n")
             return 1
 
-        cpu_shares = 4321
-        run_crun_command(['update', '--cpu-share', str(cpu_shares), cid])
-        # this is the expected cpu weight after the conversion from the CPUShares
-        expected_weight = str(max(1, min(10000, cpu_shares * 100 // 1024)))
+        for values in [(2, 1), (1024, 100), (262144, 10000)]:
+            cpu_shares = values[0]
+            # this is the expected cpu weight after the conversion from the CPUShares
+            expected_weight = str(values[1])
 
-        out = run_crun_command(["exec", cid, "/init", "cat", "/sys/fs/cgroup/cpu.weight"])
-        if expected_weight not in out:
-            sys.stderr.write("found wrong CPUWeight %s instead of %s for the container cgroup\n" % (out, expected_weight))
-            return -1
+            run_crun_command(['update', '--cpu-share', str(cpu_shares), cid])
 
-        out = subprocess.check_output(['systemctl', 'show','-PCPUWeight', scope ], close_fds=False).decode().strip()
-        # as above
-        if out != expected_weight:
-            out = subprocess.check_output(['systemctl', '--user', 'show','-PCPUWeight', scope ], close_fds=False).decode().strip()
+            out = run_crun_command(["exec", cid, "/init", "cat", "/sys/fs/cgroup/cpu.weight"])
+            if expected_weight not in out:
+                sys.stderr.write("found wrong CPUWeight %s instead of %s for the container cgroup\n" % (out, expected_weight))
+                return -1
 
-        if out != expected_weight:
-            sys.stderr.write("found wrong CPUWeight for the systemd scope\n")
-            return 1
+            out = subprocess.check_output(['systemctl', 'show','-PCPUWeight', scope ], close_fds=False).decode().strip()
+            # as above
+            if out != expected_weight:
+                out = subprocess.check_output(['systemctl', '--user', 'show','-PCPUWeight', scope ], close_fds=False).decode().strip()
+
+            if out != expected_weight:
+                sys.stderr.write("found wrong CPUWeight for the systemd scope\n")
+                return 1
     finally:
         if cid is not None:
             run_crun_command(["delete", "-f", cid])