diff --git a/tests/official/fixtures_utils.nim b/tests/official/fixtures_utils.nim
index ae7091bf23..8b7040f7df 100644
--- a/tests/official/fixtures_utils.nim
+++ b/tests/official/fixtures_utils.nim
@@ -2,6 +2,7 @@ import
   # Status libs
   blscurve, nimcrypto, byteutils,
   eth/common, serialization, json_serialization,
+  stint,
   # Beacon chain internals
   # submodule in nim-beacon-chain/tests/official/fixtures/
   ../../beacon_chain/spec/[datatypes, crypto, digest],
@@ -9,7 +10,13 @@ import
   # Workarounds
   endians # parseHex into uint64
 
-export nimcrypto.toHex
+export
+  nimcrypto.toHex,
+  # Workaround:
+  #   - https://github.com/status-im/nim-serialization/issues/4
+  #   - https://github.com/status-im/nim-serialization/issues/5
+  #   - https://github.com/nim-lang/Nim/issues/11225
+  serialization.readValue
 
 type
   # TODO: use ref object to avoid allocating
@@ -20,7 +27,7 @@ type
     test_suite*: string
     fork*: string
     test_cases*: seq[StateTestCase]
-  
+
   TestConstants* = object
     # TODO - 0.5.1 constants
     SHARD_COUNT*: int
@@ -110,7 +117,7 @@ type
 
   Domain = distinct uint64
     ## Domains have custom hex serialization
-    
+
   BLSPrivToPub* = object
     input*: ValidatorPrivKey
     output*: ValidatorPubKey
@@ -131,7 +138,14 @@ type
   BLSAggPubKey* = object
     input*: seq[ValidatorPubKey]
     output*: ValidatorPubKey
-  
+
+  SSZUint* = object
+    `type`*: string
+    value*: string
+    valid*: bool
+    ssz*: seq[byte]
+    tags*: seq[string]
+
 # #######################
 # Default init
 proc default*(T: typedesc): T = discard
@@ -163,34 +177,15 @@ proc readValue*(r: var JsonReader, a: var seq[byte]) {.inline.} =
   ## Custom deserializer for seq[byte]
   a = hexToSeqByte(r.readValue(string))
 
-template parseTestsImpl(T: untyped) {.dirty.} =
-  # TODO: workaround typedesc/generics
-  #       being broken with nim-serialization
-  #       - https://github.com/status-im/nim-serialization/issues/4
-  #       - https://github.com/status-im/nim-serialization/issues/5
+proc parseTests*(jsonPath: string, T: typedesc): Tests[T] =
   try:
-    result = Json.loadFile(jsonPath, T)
+    result = Json.loadFile(jsonPath, Tests[T])
   except SerializationError as err:
     writeStackTrace()
     stderr.write "Json load issue for file \"", jsonPath, "\"\n"
     stderr.write err.formatMsg(jsonPath), "\n"
     quit 1
 
-proc parseTestsShuffling*(jsonPath: string): Tests[Shuffling] =
-  parseTestsImpl(Tests[Shuffling])
-
-proc parseTestsBLSPrivToPub*(jsonPath: string): Tests[BLSPrivToPub] =
-  parseTestsImpl(Tests[BLSPrivToPub])
-
-proc parseTestsBLSSignMsg*(jsonPath: string): Tests[BLSSignMsg] =
-  parseTestsImpl(Tests[BLSSignMsg])
-
-proc parseTestsBLSAggSig*(jsonPath: string): Tests[BLSAggSig] =
-  parseTestsImpl(Tests[BLSAggSig])
-
-proc parseTestsBLSAggPubKey*(jsonPath: string): Tests[BLSAggPubKey] =
-  parseTestsImpl(Tests[BLSAggPubKey])
-
 # #######################
 # Mocking helpers
 # https://github.com/ethereum/eth2.0-specs/blob/75f0af45bb0613bb406fc72d10266cee4cfb402a/tests/phase0/helpers.py#L107
@@ -216,4 +211,4 @@ proc build_empty_block_for_next_slot*(state: BeaconState): BeaconBlock =
   #   prev_root,
   #   BeaconBlockBody()
   # )
-  {.error: "Not implemented".}
\ No newline at end of file
+  {.error: "Not implemented".}
diff --git a/tests/official/test_fixture_bls.nim b/tests/official/test_fixture_bls.nim
index c726054320..0f197d0f2a 100644
--- a/tests/official/test_fixture_bls.nim
+++ b/tests/official/test_fixture_bls.nim
@@ -25,10 +25,10 @@ var
 
 suite "Official - BLS tests":
   test "Parsing the official BLS tests":
-    blsPrivToPubTests = parseTestsBLSPrivToPub(TestFolder / TestsPath / "priv_to_pub" / "priv_to_pub.json")
-    blsSignMsgTests = parseTestsBLSSignMsg(TestFolder / TestsPath / "sign_msg" / "sign_msg.json")
-    blsAggSigTests = parseTestsBLSAggSig(TestFolder / TestsPath / "aggregate_sigs" / "aggregate_sigs.json")
-    blsAggPubKeyTests = parseTestsBLSAggPubKey(TestFolder / TestsPath / "aggregate_pubkeys" / "aggregate_pubkeys.json")
+    blsPrivToPubTests = parseTests(TestFolder / TestsPath / "priv_to_pub" / "priv_to_pub.json", BLSPrivToPub)
+    blsSignMsgTests = parseTests(TestFolder / TestsPath / "sign_msg" / "sign_msg.json", BLSSignMsg)
+    blsAggSigTests = parseTests(TestFolder / TestsPath / "aggregate_sigs" / "aggregate_sigs.json", BLSAggSig)
+    blsAggPubKeyTests = parseTests(TestFolder / TestsPath / "aggregate_pubkeys" / "aggregate_pubkeys.json", BLSAggPubKey)
 
   test "Private to public key conversion":
     for t in blsPrivToPubTests.test_cases:
diff --git a/tests/official/test_fixture_shuffling.nim b/tests/official/test_fixture_shuffling.nim
index 4633714906..594440e4e9 100644
--- a/tests/official/test_fixture_shuffling.nim
+++ b/tests/official/test_fixture_shuffling.nim
@@ -7,7 +7,7 @@
 
 import
   # Standard library
-  ospaths, strutils, json, unittest,
+  ospaths, strutils, unittest,
   # Third parties
 
   # Beacon chain internals
@@ -27,7 +27,7 @@ var shufflingTests: Tests[Shuffling]
 
 suite "Official - Shuffling tests [Preset: " & preset():
   test "Parsing the official shuffling tests [Preset: " & preset():
-    shufflingTests = parseTestsShuffling(TestFolder / TestsPath)
+    shufflingTests = parseTests(TestFolder / TestsPath, Shuffling)
 
   test "Shuffling a sequence of N validators" & preset():
     for t in shufflingTests.test_cases: