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physics test simulation
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parent
b52c6ee718
commit
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@ -2,10 +2,20 @@ package physics_test
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import (
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"testing"
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"time"
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. "github.com/maaslalani/confetty/physics"
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)
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const fps = 60
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func simulate(p *Physics, d time.Duration) {
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frames := int(d.Seconds() * fps)
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for i := 0; i < frames; i++ {
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p.Update()
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}
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}
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func TestNew(t *testing.T) {
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x := 8
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y := 20
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@ -21,7 +31,6 @@ func TestNew(t *testing.T) {
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}
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func TestUpdate(t *testing.T) {
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fps := 60
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physics := New(Point{0, 0}, Vector{5, 5}, Vector(Gravity), float64(fps))
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// coordinates is the location at which the object should be
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@ -37,10 +46,7 @@ func TestUpdate(t *testing.T) {
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}
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for _, c := range coordinates {
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// 1 second of simulation
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for i := 0; i < fps; i++ {
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physics.Update()
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}
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simulate(physics, time.Second)
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x := physics.PosX()
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y := physics.PosY()
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@ -67,15 +73,10 @@ func TestDisplacement(t *testing.T) {
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{x: 0, y: 0, vel: Vector{1, 1}, d: 1.414213562373097},
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}
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fps := 60
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for _, tc := range tt {
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physics := New(Point{float64(tc.x), float64(tc.y)}, tc.vel, Vector{}, float64(fps))
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// 1 second of simulation
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for i := 0; i < fps; i++ {
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physics.Update()
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}
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simulate(physics, time.Second)
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if physics.Displacement() != tc.d {
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t.Log(physics.Displacement())
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@ -88,14 +89,10 @@ func TestReset(t *testing.T) {
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x := 5
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y := 10
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vel := Vector{20, 20}
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fps := 60
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physics := New(Point{float64(x), float64(y)}, vel, Vector(Gravity), float64(fps))
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// 1 second of simulation
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for i := 0; i < fps; i++ {
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physics.Update()
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}
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simulate(physics, time.Second)
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// store the current position after 1 second of simulation we will simulate 1
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// second again and ensure that the object reaches the same position, we
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@ -114,13 +111,10 @@ func TestReset(t *testing.T) {
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t.Fatal("expected y to be reset")
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}
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// 1 second of simulation
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// here we are simply checking that the object reaches the same position
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// after being reset in the same amount of time. This ensures velocity and
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// acceleration were reset without checking them explicitly
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for i := 0; i < fps; i++ {
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physics.Update()
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}
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simulate(physics, time.Second)
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if physics.PosX() != cx {
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t.Fatal("expected simulation to be repeatable")
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