64 lines
1.9 KiB
Go
64 lines
1.9 KiB
Go
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package ephem
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import "testing"
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type testEngine struct {
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marker float64
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}
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func (engine testEngine) State(target, center Body, jdTDB float64) (pos, vel [3]float64, err error) {
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pos[0] = engine.marker + float64(target-center)
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vel[0] = jdTDB
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return pos, vel, nil
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}
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func (engine testEngine) Coverage(target Body) (start, end float64, ok bool) {
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return engine.marker, engine.marker + float64(target), true
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}
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func (engine testEngine) Apparent(target Body, jdTT float64) (dir [3]float64, distKM, tauDays float64, err error) {
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dir[0] = engine.marker + float64(target)
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return dir, jdTT, engine.marker, nil
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}
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func TestInstanceUsesItsOwnEngine(t *testing.T) {
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first := NewInstance(testEngine{marker: 1})
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second := NewInstance(testEngine{marker: 2})
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firstPos, _, err := first.State(Mars, Earth, 2451545)
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if err != nil {
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t.Fatal(err)
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}
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secondPos, _, err := second.State(Mars, Earth, 2451545)
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if err != nil {
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t.Fatal(err)
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}
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if firstPos[0] == secondPos[0] || first.Engine() == second.Engine() {
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t.Fatal("instances are not isolated")
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}
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if got, want := first.Model(), Custom; got != want {
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t.Fatalf("custom model = %v, want %v", got, want)
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}
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}
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func TestInstanceApparentAndCoverage(t *testing.T) {
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instance := NewInstance(testEngine{marker: 3})
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start, end, ok := instance.Coverage(Mars)
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if !ok || start != 3 || end != 7 {
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t.Fatalf("coverage = %v, %v, %v", start, end, ok)
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}
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dir, distance, tau, err := instance.Apparent(Mars, 2451545)
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if err != nil || dir[0] != 7 || distance != 2451545 || tau != 3 {
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t.Fatalf("apparent = %v, %v, %v, %v", dir, distance, tau, err)
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}
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}
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func TestInstanceWithoutEngineReportsExplicitErrors(t *testing.T) {
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instance := &Instance{model: BuildDefault}
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if _, _, err := instance.State(Mars, Earth, 2451545); err != ErrNoEngine {
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t.Fatalf("State error = %v, want %v", err, ErrNoEngine)
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}
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if _, _, _, err := instance.Apparent(Mars, 2451545); err != ErrNoEngine {
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t.Fatalf("Apparent error = %v, want %v", err, ErrNoEngine)
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}
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}
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