def test_construction_errors():
'''
Test that the Equations constructor raises errors correctly
'''
# parse error
assert_raises(EquationError, lambda: Equations('dv/dt = -v / tau volt'))
# Only a single string or a list of SingleEquation objects is allowed
assert_raises(TypeError, lambda: Equations(None))
assert_raises(TypeError, lambda: Equations(42))
assert_raises(TypeError, lambda: Equations(['dv/dt = -v / tau : volt']))
# duplicate variable names
assert_raises(EquationError, lambda: Equations('''dv/dt = -v / tau : volt
v = 2 * t/second * volt : volt'''))
eqs = [SingleEquation(DIFFERENTIAL_EQUATION, 'v', volt,
expr=Expression('-v / tau')),
SingleEquation(SUBEXPRESSION, 'v', volt,
expr=Expression('2 * t/second * volt'))
]
assert_raises(EquationError, lambda: Equations(eqs))
# illegal variable names
assert_raises(ValueError, lambda: Equations('ddt/dt = -dt / tau : volt'))
assert_raises(ValueError, lambda: Equations('dt/dt = -t / tau : volt'))
assert_raises(ValueError, lambda: Equations('dxi/dt = -xi / tau : volt'))
assert_raises(ValueError, lambda: Equations('for : volt'))
assert_raises((EquationError, ValueError),
lambda: Equations('d1a/dt = -1a / tau : volt'))
assert_raises(ValueError, lambda: Equations('d_x/dt = -_x / tau : volt'))
# xi in a subexpression
assert_raises(EquationError,
lambda: Equations('''dv/dt = -(v + I) / (5 * ms) : volt
I = second**-1*xi**-2*volt : volt'''))
# more than one xi
assert_raises(EquationError,
lambda: Equations('''dv/dt = -v / tau + xi/tau**.5 : volt
dx/dt = -x / tau + 2*xi/tau : volt
tau : second'''))
# using not-allowed flags
eqs = Equations('dv/dt = -v / (5 * ms) : volt (flag)')
eqs.check_flags({DIFFERENTIAL_EQUATION: ['flag']}) # allow this flag
assert_raises(ValueError, lambda: eqs.check_flags({DIFFERENTIAL_EQUATION: []}))
assert_raises(ValueError, lambda: eqs.check_flags({}))
assert_raises(ValueError, lambda: eqs.check_flags({SUBEXPRESSION: ['flag']}))
assert_raises(ValueError, lambda: eqs.check_flags({DIFFERENTIAL_EQUATION: ['otherflag']}))
# Circular subexpression
assert_raises(ValueError, lambda: Equations('''dv/dt = -(v + w) / (10 * ms) : 1
w = 2 * x : 1
x = 3 * w : 1'''))
# Boolean/integer differential equations
assert_raises(TypeError, lambda: Equations('dv/dt = -v / (10*ms) : boolean'))
assert_raises(TypeError, lambda: Equations('dv/dt = -v / (10*ms) : integer'))
def test_construction_errors():
'''
Test that the Equations constructor raises errors correctly
'''
# parse error
assert_raises(EquationError, lambda: Equations('dv/dt = -v / tau volt'))
# Only a single string or a list of SingleEquation objects is allowed
assert_raises(TypeError, lambda: Equations(None))
assert_raises(TypeError, lambda: Equations(42))
assert_raises(TypeError, lambda: Equations(['dv/dt = -v / tau : volt']))
# duplicate variable names
assert_raises(EquationError, lambda: Equations('''dv/dt = -v / tau : volt
v = 2 * t/second * volt : volt'''))
eqs = [SingleEquation(DIFFERENTIAL_EQUATION, 'v', volt,
expr=Expression('-v / tau')),
SingleEquation(SUBEXPRESSION, 'v', volt,
expr=Expression('2 * t/second * volt'))
]
assert_raises(EquationError, lambda: Equations(eqs))
# illegal variable names
assert_raises(ValueError, lambda: Equations('ddt/dt = -dt / tau : volt'))
assert_raises(ValueError, lambda: Equations('dt/dt = -t / tau : volt'))
assert_raises(ValueError, lambda: Equations('dxi/dt = -xi / tau : volt'))
assert_raises(ValueError, lambda: Equations('for : volt'))
assert_raises((EquationError, ValueError),
lambda: Equations('d1a/dt = -1a / tau : volt'))
assert_raises(ValueError, lambda: Equations('d_x/dt = -_x / tau : volt'))
# xi in a subexpression
assert_raises(EquationError,
lambda: Equations('''dv/dt = -(v + I) / (5 * ms) : volt
I = second**-1*xi**-2*volt : volt'''))
# more than one xi
assert_raises(EquationError,
lambda: Equations('''dv/dt = -v / tau + xi/tau**.5 : volt
dx/dt = -x / tau + 2*xi/tau : volt
tau : second'''))
# using not-allowed flags
eqs = Equations('dv/dt = -v / (5 * ms) : volt (flag)')
eqs.check_flags({DIFFERENTIAL_EQUATION: ['flag']}) # allow this flag
assert_raises(ValueError, lambda: eqs.check_flags({DIFFERENTIAL_EQUATION: []}))
assert_raises(ValueError, lambda: eqs.check_flags({}))
assert_raises(ValueError, lambda: eqs.check_flags({SUBEXPRESSION: ['flag']}))
assert_raises(ValueError, lambda: eqs.check_flags({DIFFERENTIAL_EQUATION: ['otherflag']}))
# Circular subexpression
assert_raises(ValueError, lambda: Equations('''dv/dt = -(v + w) / (10 * ms) : 1
w = 2 * x : 1
x = 3 * w : 1'''))
# Boolean/integer differential equations
assert_raises(TypeError, lambda: Equations('dv/dt = -v / (10*ms) : boolean'))
assert_raises(TypeError, lambda: Equations('dv/dt = -v / (10*ms) : integer'))
def test_construction_errors():
"""
Test that the Equations constructor raises errors correctly
"""
# parse error
with pytest.raises(EquationError):
Equations('dv/dt = -v / tau volt')
with pytest.raises(EquationError):
Equations('dv/dt = -v / tau : volt second')
# incorrect unit definition
with pytest.raises(EquationError):
Equations('dv/dt = -v / tau : mvolt')
with pytest.raises(EquationError):
Equations('dv/dt = -v / tau : voltage')
with pytest.raises(EquationError):
Equations('dv/dt = -v / tau : 1.0*volt')
# Only a single string or a list of SingleEquation objects is allowed
with pytest.raises(TypeError):
Equations(None)
with pytest.raises(TypeError):
Equations(42)
with pytest.raises(TypeError):
Equations(['dv/dt = -v / tau : volt'])
# duplicate variable names
with pytest.raises(EquationError):
Equations("""dv/dt = -v / tau : volt
v = 2 * t/second * volt : volt""")
eqs = [
SingleEquation(DIFFERENTIAL_EQUATION,
'v',
volt.dim,
expr=Expression('-v / tau')),
SingleEquation(SUBEXPRESSION,
'v',
volt.dim,
expr=Expression('2 * t/second * volt'))
]
with pytest.raises(EquationError):
Equations(eqs)
# illegal variable names
with pytest.raises(SyntaxError):
Equations('ddt/dt = -dt / tau : volt')
with pytest.raises(SyntaxError):
Equations('dt/dt = -t / tau : volt')
with pytest.raises(SyntaxError):
Equations('dxi/dt = -xi / tau : volt')
with pytest.raises(SyntaxError):
Equations('for : volt')
with pytest.raises((EquationError, SyntaxError)):
Equations('d1a/dt = -1a / tau : volt')
with pytest.raises(SyntaxError):
Equations('d_x/dt = -_x / tau : volt')
# xi in a subexpression
with pytest.raises(EquationError):
Equations("""dv/dt = -(v + I) / (5 * ms) : volt
I = second**-1*xi**-2*volt : volt""")
# more than one xi
with pytest.raises(EquationError):
Equations("""dv/dt = -v / tau + xi/tau**.5 : volt
dx/dt = -x / tau + 2*xi/tau : volt
tau : second""")
# using not-allowed flags
eqs = Equations('dv/dt = -v / (5 * ms) : volt (flag)')
eqs.check_flags({DIFFERENTIAL_EQUATION: ['flag']}) # allow this flag
with pytest.raises(ValueError):
eqs.check_flags({DIFFERENTIAL_EQUATION: []})
with pytest.raises(ValueError):
eqs.check_flags({})
with pytest.raises(ValueError):
eqs.check_flags({SUBEXPRESSION: ['flag']})
with pytest.raises(ValueError):
eqs.check_flags({DIFFERENTIAL_EQUATION: ['otherflag']})
eqs = Equations('dv/dt = -v / (5 * ms) : volt (flag1, flag2)')
eqs.check_flags({DIFFERENTIAL_EQUATION: ['flag1',
'flag2']}) # allow both flags
# Don't allow the two flags in combination
with pytest.raises(ValueError):
eqs.check_flags({DIFFERENTIAL_EQUATION: ['flag1', 'flag2']},
incompatible_flags=[('flag1', 'flag2')])
eqs = Equations("""dv/dt = -v / (5 * ms) : volt (flag1)
dw/dt = -w / (5 * ms) : volt (flag2)""")
# They should be allowed when used independently
eqs.check_flags({DIFFERENTIAL_EQUATION: ['flag1', 'flag2']},
incompatible_flags=[('flag1', 'flag2')])
# Circular subexpression
with pytest.raises(ValueError):
Equations("""dv/dt = -(v + w) / (10 * ms) : 1
w = 2 * x : 1
x = 3 * w : 1""")
# Boolean/integer differential equations
with pytest.raises(TypeError):
Equations('dv/dt = -v / (10*ms) : boolean')
with pytest.raises(TypeError):
Equations('dv/dt = -v / (10*ms) : integer')
def test_construction_errors():
'''
Test that the Equations constructor raises errors correctly
'''
# parse error
assert_raises(SyntaxError, lambda: Equations('dv/dt = -v / tau volt'))
# Only a single string or a list of SingleEquation objects is allowed
assert_raises(TypeError, lambda: Equations(None))
assert_raises(TypeError, lambda: Equations(42))
assert_raises(TypeError, lambda: Equations(['dv/dt = -v / tau : volt']))
# duplicate variable names
assert_raises(SyntaxError, lambda: Equations('''dv/dt = -v / tau : volt
v = 2 * t/second * volt : volt'''))
# illegal variable names
assert_raises(ValueError, lambda: Equations('ddt/dt = -dt / tau : volt'))
assert_raises(ValueError, lambda: Equations('dt/dt = -t / tau : volt'))
assert_raises(ValueError, lambda: Equations('dxi/dt = -xi / tau : volt'))
assert_raises(ValueError, lambda: Equations('for : volt'))
assert_raises((SyntaxError, ValueError),
lambda: Equations('d1a/dt = -1a / tau : volt'))
assert_raises(ValueError, lambda: Equations('d_x/dt = -_x / tau : volt'))
# inconsistent unit for a differential equation
assert_raises(DimensionMismatchError,
lambda: Equations('dv/dt = -v : volt'))
assert_raises(DimensionMismatchError,
lambda: Equations('dv/dt = -v / tau: volt',
namespace={'tau': 5 * mV}))
assert_raises(DimensionMismatchError,
lambda: Equations('dv/dt = -(v + I) / (5 * ms): volt',
namespace={'I': 3 * second}))
# inconsistent unit for a static equation
assert_raises(DimensionMismatchError,
lambda: Equations('''dv/dt = -v / (5 * ms) : volt
I = 2 * v : amp'''))
# xi in a static equation
assert_raises(SyntaxError,
lambda: Equations('''dv/dt = -(v + I) / (5 * ms) : volt
I = second**-1*xi**-2*volt : volt''' ))
# more than one xi
assert_raises(SyntaxError,
lambda: Equations('''dv/dt = -v / tau + xi/tau**.5 : volt
dx/dt = -x / tau + 2*xi/tau : volt
tau : second'''))
# using not-allowed flags
eqs = Equations('dv/dt = -v / (5 * ms) : volt (flag)')
eqs.check_flags({DIFFERENTIAL_EQUATION: ['flag']}) # allow this flag
assert_raises(ValueError, lambda: eqs.check_flags({DIFFERENTIAL_EQUATION: []}))
assert_raises(ValueError, lambda: eqs.check_flags({}))
assert_raises(ValueError, lambda: eqs.check_flags({STATIC_EQUATION: ['flag']}))
assert_raises(ValueError, lambda: eqs.check_flags({DIFFERENTIAL_EQUATION: ['otherflag']}))
# Circular static equations
assert_raises(ValueError, lambda: Equations('''dv/dt = -(v + w) / (10 * ms) : 1
w = 2 * x : 1
x = 3 * w : 1'''))