diff --git a/codex/slotbuilder/slotbuilder.nim b/codex/slotbuilder/slotbuilder.nim
index 21ef9024..f9bd1268 100644
--- a/codex/slotbuilder/slotbuilder.nim
+++ b/codex/slotbuilder/slotbuilder.nim
@@ -1,6 +1,22 @@
+import pkg/libp2p
+import ../blocktype
+import ../stores
+import ../manifest
 
 type
   SlotBuilder* = object of RootObj
+    blockStore: BlockStore
+    manifest: Manifest
 
-proc aaa*(self: SlotBuilder): void =
-  echo "aaa"
+proc new*(
+    T: type SlotBuilder,
+    blockStore: BlockStore,
+    manifest: Manifest
+): SlotBuilder =
+  SlotBuilder(
+    blockStore: blockStore,
+    manifest: manifest
+  )
+
+proc getSlotBlockCids*(self: SlotBuilder, datasetSlotIndex: uint64): seq[Cid] =
+  raiseAssert("a")
diff --git a/tests/codex/slotbuilder/testslotbuilder.nim b/tests/codex/slotbuilder/testslotbuilder.nim
index 6eeb1971..f9243eb4 100644
--- a/tests/codex/slotbuilder/testslotbuilder.nim
+++ b/tests/codex/slotbuilder/testslotbuilder.nim
@@ -1,17 +1,76 @@
+import std/sequtils
 import pkg/chronos
 import pkg/asynctest
 import pkg/questionable/results
 import pkg/codex/blocktype as bt
-import pkg/codex/stores/cachestore
+import pkg/codex/rng
+import pkg/codex/stores
+import pkg/codex/chunker
+import pkg/codex/merkletree
 
 import ../helpers
 
 import codex/slotbuilder/slotbuilder
 
 asyncchecksuite "Slot builder":
-  test "a":
-    let builder = SlotBuilder()
-    builder.aaa()
+  let
+    blockSize = 64 * 1024
+    numberOfSlotBlocks = 6
+    numberOfSlots = 5
+    datasetSize = numberOfSlotBlocks * numberOfSlots * blockSize
+    chunker = RandomChunker.new(Rng.instance(), size = datasetSize, chunkSize = blockSize)
 
-    check:
-      1 == 1
+  var
+    datasetBlocks: seq[bt.Block]
+    localStore = CacheStore.new()
+    protectedManifest: Manifest
+    slotBuilder: SlotBuilder
+
+  proc createBlocks(): Future[void] {.async.} =
+    while true:
+      let chunk = await chunker.getBytes()
+      if chunk.len <= 0:
+        break
+      let blk = bt.Block.new(chunk).tryGet()
+      datasetBlocks.add(blk)
+      discard await localStore.putBlock(blk)
+
+  proc createProtectedManifest(): Future[void] {.async.} =
+    let
+      cids = datasetBlocks.mapIt(it.cid)
+      tree = MerkleTree.init(cids).tryGet()
+      treeCid = tree.rootCid().tryGet()
+
+    for index, cid in cids:
+      let proof = tree.getProof(index).tryget()
+      discard await localStore.putBlockCidAndProof(treeCid, index, cid, proof)
+
+    protectedManifest = Manifest.new(
+      manifest = Manifest.new(
+        treeCid = treeCid,
+        blockSize = blockSize.NBytes,
+        datasetSize = datasetSize.NBytes),
+      treeCid = treeCid,
+      datasetSize = datasetSize.NBytes,
+      ecK = numberOfSlots,
+      ecM = 0
+    )
+
+    let manifestBlock = bt.Block.new(protectedManifest.encode().tryGet(), codec = DagPBCodec).tryGet()
+    discard await localStore.putBlock(manifestBlock)
+
+  setup:
+    await createBlocks()
+    await createProtectedManifest()
+    slotBuilder = SlotBuilder.new(localStore, protectedManifest)
+
+  for i in 0 ..< numberOfSlots:
+    test "Can get the protected slot blocks given a slot index (" & $i & ")":
+      let
+        selectStart = i * numberOfSlotBlocks
+        selectEnd = selectStart + numberOfSlotBlocks
+        expectedCids = datasetBlocks.mapIt(it.cid)[selectStart ..< selectEnd]
+        cids = slotBuilder.getSlotBlockCids(i.uint64)
+
+      check:
+        cids == expectedCids