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package hm
import "testing"
var solverTest = []struct {
cs Constraints
expected Subs
err bool
}{
{Constraints{{TypeVariable('a'), proton}}, mSubs{'a': proton}, false},
{Constraints{{NewFnType(TypeVariable('a'), proton), neutron}}, nil, true},
{Constraints{{NewFnType(TypeVariable('a'), proton), NewFnType(proton, proton)}}, mSubs{'a': proton}, false},
{Constraints{
{
NewFnType(TypeVariable('a'), TypeVariable('a'), list{TypeVariable('a')}),
NewFnType(proton, proton, TypeVariable('b')),
},
},
mSubs{'a': proton, 'b': list{proton}}, false,
},
{
Constraints{
{TypeVariable('a'), TypeVariable('b')},
{TypeVariable('a'), proton},
},
mSubs{'a': proton}, false,
},
{
Constraints{
{
NewRecordType("", TypeVariable('a'), TypeVariable('a'), TypeVariable('b')),
NewRecordType("", neutron, neutron, proton),
},
},
mSubs{'a': neutron, 'b': proton}, false,
},
}
func TestSolver(t *testing.T) {
for i, sts := range solverTest {
solver := newSolver()
solver.solve(sts.cs)
if sts.err {
if solver.err == nil {
t.Errorf("Test %d Expected an error", i)
}
continue
} else if solver.err != nil {
t.Error(solver.err)
}
for _, v := range sts.expected.Iter() {
if T, ok := solver.sub.Get(v.Tv); !ok {
t.Errorf("Test %d: Expected type variable %v in subs: %v", i, v.Tv, solver.sub)
break
} else if T != v.T {
t.Errorf("Test %d: Expected replacement to be %v. Got %v instead", i, v.T, T)
}
}
}
}
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