37 lines
854 B
Go
37 lines
854 B
Go
package coord
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import "testing"
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// TestFloorDiv 验证负坐标安全的向下取整除法（设计.md §4.1 踩坑）。
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func TestFloorDiv(t *testing.T) {
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cases := []struct {
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a, b, want int32
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}{
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{15, 16, 0},
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{16, 16, 1},
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{-1, 16, -1},
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{-16, 16, -1},
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{-17, 16, -2},
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{0, 16, 0},
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}
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for _, c := range cases {
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if got := FloorDiv(c.a, c.b); got != c.want {
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t.Fatalf("FloorDiv(%d, %d) = %d，期望 %d", c.a, c.b, got, c.want)
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}
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}
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}
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// TestChunkLocal 验证区块坐标与局部坐标互转（含负数）。
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func TestChunkLocal(t *testing.T) {
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for _, wx := range []int32{-33, -17, -16, -1, 0, 15, 16, 31} {
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cx := ChunkCoord(wx)
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lx := LocalCoord(wx)
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if lx < 0 || lx >= 16 {
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t.Fatalf("LocalCoord(%d) = %d 越界", wx, lx)
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}
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if cx*16+lx != wx {
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t.Fatalf("坐标还原失败: %d → cx=%d lx=%d", wx, cx, lx)
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}
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}
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}
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