@@ -320,6 +320,7 @@ def test_multiply_ss(self, sys222, sys322):
320320 np .testing .assert_array_almost_equal (sys .C , C )
321321 np .testing .assert_array_almost_equal (sys .D , D )
322322
323+ @slycotonly
323324 def test_add_sub_mimo_siso (self ):
324325 # Test SS with SS
325326 ss_siso = StateSpace (
@@ -411,6 +412,7 @@ def test_add_sub_mimo_siso(self):
411412 ss2tf (result ).minreal (),
412413 )
413414
415+ @slycotonly
414416 @pytest .mark .parametrize (
415417 "left, right, expected" ,
416418 [
@@ -485,6 +487,7 @@ def test_mul_mimo_siso(self, left, right, expected):
485487 ss2tf (result ).minreal (),
486488 )
487489
490+ @slycotonly
488491 @pytest .mark .parametrize (
489492 "left, right, expected" ,
490493 [
@@ -559,6 +562,7 @@ def test_rmul_mimo_siso(self, left, right, expected):
559562 ss2tf (result ).minreal (),
560563 )
561564
565+ @slycotonly
562566 def test_pow (self , sys222 , sys322 ):
563567 """Test state space powers."""
564568 for sys in [sys222 , sys322 ]:
@@ -604,6 +608,7 @@ def test_pow(self, sys222, sys322):
604608 ss2tf (result ).minreal (),
605609 )
606610
611+ @slycotonly
607612 def test_truediv (self , sys222 , sys322 ):
608613 """Test state space truediv"""
609614 for sys in [sys222 , sys322 ]:
@@ -622,6 +627,7 @@ def test_truediv(self, sys222, sys322):
622627 ss2tf (result ).minreal (),
623628 )
624629
630+ @slycotonly
625631 def test_rtruediv (self , sys222 , sys322 ):
626632 """Test state space rtruediv"""
627633 for sys in [sys222 , sys322 ]:
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