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package bolt
import (
"testing"
"unsafe"
"github.com/stretchr/testify/assert"
)
// Ensure that a branch can replace a key.
func TestBranchPutReplace(t *testing.T) {
b := &branch{
items: branchItems{
branchItem{pgid: 1, key: []byte("bar")},
branchItem{pgid: 2, key: []byte("baz")},
branchItem{pgid: 3, key: []byte("foo")},
},
}
b.put(1, 4, []byte("bar"), true)
b.put(2, 5, []byte("boo"), true)
assert.Equal(t, len(b.items), 3)
assert.Equal(t, b.items[0].pgid, pgid(4))
assert.Equal(t, string(b.items[0].key), "bar")
assert.Equal(t, b.items[1].pgid, pgid(5))
assert.Equal(t, string(b.items[1].key), "boo")
assert.Equal(t, b.items[2].pgid, pgid(3))
assert.Equal(t, string(b.items[2].key), "foo")
}
// Ensure that a branch can insert a key.
func TestBranchPutInsert(t *testing.T) {
b := &branch{
items: branchItems{
branchItem{pgid: 1, key: []byte("bar")},
branchItem{pgid: 2, key: []byte("foo")},
},
}
b.put(1, 4, []byte("baz"), false)
b.put(2, 5, []byte("zzz"), false)
assert.Equal(t, len(b.items), 4)
assert.Equal(t, b.items[0].pgid, pgid(1))
assert.Equal(t, string(b.items[0].key), "bar")
assert.Equal(t, b.items[1].pgid, pgid(4))
assert.Equal(t, string(b.items[1].key), "baz")
assert.Equal(t, b.items[2].pgid, pgid(2))
assert.Equal(t, string(b.items[2].key), "foo")
assert.Equal(t, b.items[3].pgid, pgid(5))
assert.Equal(t, string(b.items[3].key), "zzz")
}
// Ensure that a branch can deserialize from a page.
func TestBranchRead(t *testing.T) {
// Create a page.
var buf [4096]byte
page := (*page)(unsafe.Pointer(&buf[0]))
page.count = 2
// Insert 2 items at the beginning. sizeof(bnode) == 16
nodes := (*[3]bnode)(unsafe.Pointer(&page.ptr))
nodes[0] = bnode{pos: 32, ksize: 3, pgid: 100} // pos = sizeof(bnode) * 2
nodes[1] = bnode{pos: 19, ksize: 10, pgid: 101} // pos = sizeof(bnode) + 3
// Write data for the nodes at the end.
data := (*[4096]byte)(unsafe.Pointer(&nodes[2]))
copy(data[:], []byte("bar"))
copy(data[3:], []byte("helloworld"))
// Deserialize page into a branch.
b := &branch{}
b.read(page)
// Check that there are two items with correct data.
assert.Equal(t, len(b.items), 2)
assert.Equal(t, b.items[0].key, []byte("bar"))
assert.Equal(t, b.items[1].key, []byte("helloworld"))
}
// Ensure that a branch can serialize itself.
func TestBranchWrite(t *testing.T) {
b := &branch{
items: branchItems{
branchItem{pgid: 1, key: []byte("susy")},
branchItem{pgid: 2, key: []byte("ricki")},
branchItem{pgid: 3, key: []byte("john")},
},
}
// Write it to a page.
var buf [4096]byte
p := (*page)(unsafe.Pointer(&buf[0]))
b.write(p)
// Read the page back in.
b2 := &branch{}
b2.read(p)
// Check that the two pages are the same.
assert.Equal(t, len(b2.items), 3)
assert.Equal(t, b2.items[0].pgid, pgid(1))
assert.Equal(t, b2.items[0].key, []byte("susy"))
assert.Equal(t, b2.items[1].pgid, pgid(2))
assert.Equal(t, b2.items[1].key, []byte("ricki"))
assert.Equal(t, b2.items[2].pgid, pgid(3))
assert.Equal(t, b2.items[2].key, []byte("john"))
}
// Ensure that a branch can split into appropriate subgroups.
func TestBranchSplit(t *testing.T) {
// Create a branch.
b := &branch{
items: branchItems{
branchItem{pgid: 1, key: []byte("00000001")},
branchItem{pgid: 2, key: []byte("00000002")},
branchItem{pgid: 3, key: []byte("00000003")},
branchItem{pgid: 4, key: []byte("00000004")},
branchItem{pgid: 5, key: []byte("00000005")},
},
}
// Split between 3 & 4.
branches := b.split(100)
assert.Equal(t, len(branches), 2)
assert.Equal(t, len(branches[0].items), 2)
assert.Equal(t, len(branches[1].items), 3)
}
// Ensure that a branch with the minimum number of items just returns a single branch.
func TestBranchSplitWithMinKeys(t *testing.T) {
// Create a branch.
b := &branch{
items: branchItems{
branchItem{pgid: 1, key: []byte("00000001")},
branchItem{pgid: 2, key: []byte("00000002")},
},
}
// Split.
branches := b.split(20)
assert.Equal(t, len(branches), 1)
assert.Equal(t, len(branches[0].items), 2)
}
// Ensure that a branch that has keys that all fit on a page just returns one branch.
func TestBranchSplitFitsInPage(t *testing.T) {
// Create a branch.
b := &branch{
items: branchItems{
branchItem{pgid: 1, key: []byte("00000001")},
branchItem{pgid: 2, key: []byte("00000002")},
branchItem{pgid: 3, key: []byte("00000003")},
branchItem{pgid: 4, key: []byte("00000004")},
branchItem{pgid: 5, key: []byte("00000005")},
},
}
// Split.
branches := b.split(4096)
assert.Equal(t, len(branches), 1)
assert.Equal(t, len(branches[0].items), 5)
}
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