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package strain_test
import (
"testing"
"image"
"slices"
"github.com/lithdew/casso"
"github.com/faiface/gui/style"
"github.com/faiface/gui/lay/strain"
)
type solverTest struct {
t *testing.T
*style.Style
*strain.Solver
}
func newSolverTest(t *testing.T, constraints []<-chan strain.Constraint) solverTest {
styl, err := style.New()
if err != nil {
t.Fatal(err)
}
solver, err := strain.NewSolver(styl, constraints)
if err != nil {
t.Fatal(err)
}
return solverTest{t, styl, solver}
}
func (st solverTest) Close() {
st.Solver.Close()
if err := st.Style.Close(); err != nil {
st.t.Error(err)
}
}
func (st solverTest) addConstraint(op casso.Op, lhs, rhs casso.Symbol) {
if err := st.Solver.AddConstraint(op, lhs, rhs); err != nil {
st.t.Error(err)
}
}
func (st solverTest) solve(container image.Rectangle, wantFields []image.Rectangle) {
fields, err := st.Solver.Solve(container)
if err != nil {
st.t.Errorf("Solve(%v): %v; want %v", container, err, wantFields)
}
if !slices.Equal(fields, wantFields) {
st.t.Errorf("Solve(%v) = %v; want %v", container, fields, wantFields)
}
}
// No constraints and zero-sized container.
func TestTrivial(t *testing.T) {
t.Parallel()
st := newSolverTest(t, nil)
defer st.Close()
fields, err := st.Solver.Solve(image.ZR)
if err != nil {
t.Error(err)
}
if len(fields) != 0 {
t.Errorf("expected 0 fields; got %d", len(fields))
}
}
// One field that occupies the whole container.
func TestSingleField(t *testing.T) {
// Setup
t.Parallel()
constraints := make(chan strain.Constraint)
st := newSolverTest(t, []<-chan strain.Constraint{constraints})
defer st.Close()
defer close(constraints)
// Add constraints
container := st.Solver.Container()
field := st.Solver.Field(0)
st.addConstraint(casso.EQ, field.Origin.X, container.Origin.X)
st.addConstraint(casso.EQ, field.Origin.Y, container.Origin.Y)
st.addConstraint(casso.EQ, field.Size.X, container.Size.X)
st.addConstraint(casso.EQ, field.Size.Y, container.Size.Y)
// Solve
for _, container := range []image.Rectangle{
image.ZR,
image.Rectangle{image.ZP, image.Pt(800, 600)},
image.Rectangle{image.Pt(12, 34), image.Pt(123, 456)},
} {
// field == container
st.solve(container, []image.Rectangle{container})
}
}
// Solver with only layout constaints, no field constraints.
func TestLayConstrs(t *testing.T) {
t.Parallel()
st := newSolverTest(t, nil)
defer st.Close()
t.Fail() // TODO
}
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