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Tests for skipping unnecessary writes
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import std/options | ||
import std/sequtils | ||
import std/tables | ||
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import pkg/asynctest | ||
import pkg/chronos | ||
import pkg/questionable | ||
import pkg/questionable/results | ||
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import pkg/datastore | ||
import pkg/datastore/defaultimpl | ||
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type | ||
MockDatastore* = ref object of Datastore | ||
values: TableRef[Key, seq[byte]] | ||
lock: AsyncLock | ||
calls: seq[MethodCall] | ||
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Method = enum | ||
Put, Get, Delete, Has | ||
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MethodCall = object | ||
key: Key | ||
case kind: Method | ||
of Put: | ||
data: seq[byte] | ||
of Get, Delete, Has: | ||
discard | ||
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method put*(self: MockDatastore, key: Key, data: seq[byte]): Future[?!void] {.async.} = | ||
self.calls.add(MethodCall(kind: Put, key: key, data: data)) | ||
self.values[key] = data | ||
success() | ||
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method get*(self: MockDatastore, key: Key): Future[?!seq[byte]] {.async.} = | ||
self.calls.add(MethodCall(kind: Get, key: key)) | ||
if key notin self.values: | ||
failure(newException(DatastoreKeyNotFound, "Key doesn't exist")) | ||
else: | ||
success(self.values[key]) | ||
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method has*(self: MockDatastore, key: Key): Future[?!bool] {.async.} = | ||
self.calls.add(MethodCall(kind: Has, key: key)) | ||
success(key in self.values) | ||
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method delete*(self: MockDatastore, key: Key): Future[?!void] {.async.} = | ||
self.calls.add(MethodCall(kind: Delete, key: key)) | ||
self.values.del(key) | ||
success() | ||
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method modifyGet*(self: MockDatastore, key: Key, fn: ModifyGet): Future[?!seq[byte]] {.async.} = | ||
await defaultModifyGetImpl(self, self.lock, key, fn) | ||
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method modify*(self: MockDatastore, key: Key, fn: Modify): Future[?!void] {.async.} = | ||
await defaultModifyImpl(self, self.lock, key, fn) | ||
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proc new*( | ||
T: type MockDatastore): T = | ||
T( | ||
values: newTable[Key, seq[byte]](), | ||
lock: newAsyncLock(), | ||
calls: newSeq[MethodCall]() | ||
) | ||
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suite "Test defaultimpl": | ||
var | ||
ds: MockDatastore | ||
key: Key | ||
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setup: | ||
ds = MockDatastore.new() | ||
key = Key.init("/a/b").tryGet() | ||
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test "should put a value that is different than current value": | ||
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(await ds.put(key, @[byte 1, 2, 3])).tryGet() | ||
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proc modifyFn(maybeCurr: ?seq[byte]): Future[?seq[byte]] {.async.} = | ||
some(@[byte 3, 2, 1]) | ||
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(await ds.modify(key, modifyFn)).tryGet() | ||
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check: | ||
ds.calls.filterIt(it.kind == Put).len == 2 | ||
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test "should not attempt to put value that is equal to current value": | ||
(await ds.put(key, @[byte 1, 2, 3])).tryGet() | ||
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proc modifyFn(maybeCurr: ?seq[byte]): Future[?seq[byte]] {.async.} = | ||
some(@[byte 1, 2, 3]) | ||
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(await ds.modify(key, modifyFn)).tryGet() | ||
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check: | ||
ds.calls.filterIt(it.kind == Put).len == 1 |
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