fix test generators for mainnet max slashing penalties

tests/core/pyspec/eth2spec/test/phase0/epoch_processing/test_process_slashings.py

@@ -26,7 +26,12 @@ def slash_validators(spec, state, indices, out_epochs):
 @with_all_phases
 @spec_state_test
 def test_max_penalties(spec, state):
-    slashed_count = (len(state.validators) // spec.PROPORTIONAL_SLASHING_MULTIPLIER) + 1
+    # Slashed count to ensure that enough validators are slashed to induce maximum penalties
+    slashed_count = min(
+        (len(state.validators) // spec.PROPORTIONAL_SLASHING_MULTIPLIER) + 1,
+        # Can't slash more than validator count!
+        len(state.validators)
+    )
     out_epoch = spec.get_current_epoch(state) + (spec.EPOCHS_PER_SLASHINGS_VECTOR // 2)
 
     slashed_indices = list(range(slashed_count))