mark currently failing IR tests as xfail

tests/test_ssa_generation.py

@@ -374,7 +374,7 @@ def test_basic_loop_phi():
     verify_properties_hold(contract)
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_phi_propagation_loop():
     contract = """
      pragma solidity ^0.8.11;
@@ -395,7 +395,7 @@ def test_phi_propagation_loop():
     verify_properties_hold(contract)
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_free_function_properties():
     contract = """
         pragma solidity ^0.8.11;
@@ -459,7 +459,7 @@ def test_ssa_inter_transactional():
         assert assign2.lvalue in phi.rvalues
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_ssa_phi_callbacks():
     source = """
     pragma solidity ^0.8.11;
@@ -518,7 +518,7 @@ def test_ssa_phi_callbacks():
         assert len(after_call_phi.rvalues) == 2
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_storage_refers_to():
     """Test the storage aspects of the SSA IR
 
@@ -585,7 +585,7 @@ def test_storage_refers_to():
         assert phinodes[1].lvalue in entryphi[0].rvalues or entryphi[1].rvalues
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 @pytest.mark.skipif(
     not valid_version("0.4.0"), reason="Solidity version 0.4.0 not available on this platform"
 )
@@ -622,7 +622,7 @@ def test_initial_version_exists_for_locals():
         assert a_0.non_ssa_version == a_1.non_ssa_version
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 @pytest.mark.skipif(
     not valid_version("0.4.0"), reason="Solidity version 0.4.0 not available on this platform"
 )
@@ -662,7 +662,7 @@ def test_initial_version_exists_for_state_variables():
         assert len(get_ssa_of_type(f, Phi)) == 0
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_initial_version_exists_for_state_variables_function_assign():
     """
     In solidity you can write statements such as
@@ -759,7 +759,7 @@ def test_shadow_local():
         assert all(map(lambda x: x.lvalue.index == 1, get_ssa_of_type(f, Assignment)))
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_multiple_named_args_returns():
     """Verifies that named arguments and return values have correct versions
 
@@ -788,7 +788,7 @@ def test_multiple_named_args_returns():
         )
 
 
-@pytest.mark.xfail(reason="Tests for wanted state of SSA IR, not current.")
+@pytest.mark.xfail(reason="Tests for wanted state of SSA IR, not current.", strict=True)
 def test_memory_array():
     src = """
     contract MemArray {
@@ -854,7 +854,7 @@ def test_memory_array():
         assert len(phi_entry_b.rvalues) == len(b_args) + 1
 
 
-@pytest.mark.xfail(reason="Tests for wanted state of SSA IR, not current.")
+@pytest.mark.xfail(reason="Tests for wanted state of SSA IR, not current.", strict=True)
 def test_storage_array():
     src = """
     contract StorageArray {
@@ -909,7 +909,7 @@ def test_storage_array():
         assert len(phi_entry_b.rvalues) == 3  # See comment in b above
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_issue_468():
     """
     Ensure issue 468 is corrected as per
@@ -963,7 +963,7 @@ def test_issue_468():
         assert phi_endif.lvalue in phi_entry.rvalues
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_issue_434():
     source = """
      contract Contract {
@@ -1017,7 +1017,7 @@ def test_issue_434():
         assert aftercall_phi.lvalue in (add_f.variable_left, add_f.variable_right)
 
 
-@pytest.mark.skip(reason="Fails in current slither version. Fix in #1102.")
+@pytest.mark.xfail(strict=True, reason="Fails in current slither version. Fix in #1102.")
 def test_issue_473():
     source = """
     contract Contract {