diff --git a/src/fsfw/serialize/SerializeIF.h b/src/fsfw/serialize/SerializeIF.h
index 54a1f4e3..2b466839 100644
--- a/src/fsfw/serialize/SerializeIF.h
+++ b/src/fsfw/serialize/SerializeIF.h
@@ -64,7 +64,7 @@ class SerializeIF {
   /**
    * Forwards to regular @serialize call with network endianness
    */
-  virtual ReturnValue_t serializeNe(uint8_t** buffer, size_t* size, size_t maxSize) {
+  virtual ReturnValue_t serializeNe(uint8_t **buffer, size_t *size, size_t maxSize) {
     return serialize(buffer, size, maxSize, SerializeIF::Endianness::NETWORK);
   }
   /**
@@ -105,13 +105,13 @@ class SerializeIF {
   /**
    * Forwards to regular @deSerialize call with network endianness
    */
-  virtual ReturnValue_t deSerializeNe(const uint8_t** buffer, size_t* size) {
+  virtual ReturnValue_t deSerializeNe(const uint8_t **buffer, size_t *size) {
     return deSerialize(buffer, size, SerializeIF::Endianness::NETWORK);
   }
   /**
    * If endianness is not explicitly specified, use machine endianness
    */
-  virtual ReturnValue_t deSerialize(const uint8_t** buffer, size_t *size) {
+  virtual ReturnValue_t deSerialize(const uint8_t **buffer, size_t *size) {
     return deSerialize(buffer, size, SerializeIF::Endianness::MACHINE);
   }
 
diff --git a/src/fsfw/tmtcpacket/ccsds/PacketSeqCtrl.h b/src/fsfw/tmtcpacket/ccsds/PacketSeqCtrl.h
index 830a6fa2..cd4e153e 100644
--- a/src/fsfw/tmtcpacket/ccsds/PacketSeqCtrl.h
+++ b/src/fsfw/tmtcpacket/ccsds/PacketSeqCtrl.h
@@ -12,6 +12,10 @@ struct PacketSeqCtrl : public SerializeIF {
   PacketSeqCtrl(ccsds::SequenceFlags seqFlags, uint16_t seqCount)
       : seqFlags(seqFlags), seqCount(seqCount) {}
 
+  bool operator==(const PacketSeqCtrl &other) const {
+    return seqCount == other.seqCount and seqFlags == other.seqFlags;
+  }
+
   /**
    * NOTE: If the sequence control has an invalid value, the invalid bits will be cut off
    * @return
diff --git a/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.cpp b/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.cpp
index 05da88b4..20c9341f 100644
--- a/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.cpp
+++ b/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.cpp
@@ -81,3 +81,5 @@ void SpacePacketCreator::setPacketType(ccsds::PacketType type) {
   params.packetId.packetType = type;
 }
 bool SpacePacketCreator::operator==(const SpacePacketCreator &other) const { return false; }
+
+SpacePacketCreator::operator bool() const { return isValid(); }
diff --git a/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.h b/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.h
index d30457ea..9c13bd5a 100644
--- a/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.h
+++ b/src/fsfw/tmtcpacket/ccsds/SpacePacketCreator.h
@@ -26,6 +26,7 @@ class SpacePacketCreator : public SpacePacketIF, public SerializeIF {
   explicit SpacePacketCreator(SpacePacketParams params);
 
   bool operator==(const SpacePacketCreator &other) const;
+  explicit operator bool() const;
 
   SpacePacketCreator(ccsds::PacketType packetType, bool secHeaderFlag, uint16_t apid,
                      ccsds::SequenceFlags seqFlags, uint16_t seqCount, uint16_t dataLen,
diff --git a/src/fsfw/tmtcservices/TmStoreHelper.cpp b/src/fsfw/tmtcservices/TmStoreHelper.cpp
index 44b2e6a1..3260d4d1 100644
--- a/src/fsfw/tmtcservices/TmStoreHelper.cpp
+++ b/src/fsfw/tmtcservices/TmStoreHelper.cpp
@@ -14,13 +14,10 @@ TmStoreHelper::TmStoreHelper(uint16_t defaultApid, StorageManagerIF* tmStore) :
 }
 
 ReturnValue_t TmStoreHelper::preparePacket(uint8_t service, uint8_t subservice, uint16_t counter) {
-  // TODO: Implement
-  // creator.setApid(apid);
   PusTmParams& params = creator.getParams();
   params.secHeader.service = service;
   params.secHeader.subservice = subservice;
   params.secHeader.messageTypeCounter = counter;
-  // TODO: Implement serialize and then serialize into the store
   return HasReturnvaluesIF::RETURN_OK;
 }
 
@@ -31,22 +28,21 @@ const store_address_t& TmStoreHelper::getCurrentAddr() const { return currentAdd
 ReturnValue_t TmStoreHelper::deletePacket() { return tmStore->deleteData(currentAddr); }
 
 void TmStoreHelper::setSourceDataRaw(const uint8_t* data, size_t len) {
-  PusTmParams& params = creator.getParams();
-  params.dataWrapper.type = ecss::DataTypes::RAW;
-  params.dataWrapper.dataUnion.raw.data = data;
-  params.dataWrapper.dataUnion.raw.len = len;
+  creator.setRawUserData(data, len);
 }
 
 void TmStoreHelper::setSourceDataSerializable(SerializeIF* serializable) {
-  PusTmParams& params = creator.getParams();
-  params.dataWrapper.type = ecss::DataTypes::SERIALIZABLE;
-  params.dataWrapper.dataUnion.serializable = serializable;
+  creator.setSerializableUserData(serializable);
 }
 
 ReturnValue_t TmStoreHelper::addPacketToStore() {
   creator.updateSpLengthField();
   uint8_t* dataPtr;
-  tmStore->getFreeElement(&currentAddr, creator.getSerializedSize(), &dataPtr);
+  ReturnValue_t result =
+      tmStore->getFreeElement(&currentAddr, creator.getSerializedSize(), &dataPtr);
+  if (result != HasReturnvaluesIF::RETURN_OK) {
+    return result;
+  }
   size_t serLen = 0;
   return creator.serialize(&dataPtr, &serLen, creator.getSerializedSize(),
                            SerializeIF::Endianness::NETWORK);
@@ -55,4 +51,5 @@ ReturnValue_t TmStoreHelper::addPacketToStore() {
 void TmStoreHelper::setTimeStamper(TimeStamperIF* timeStamper_) {
   creator.setTimeStamper(timeStamper_);
 }
+
 void TmStoreHelper::setApid(uint16_t apid) { creator.setApid(apid); }
diff --git a/unittests/CMakeLists.txt b/unittests/CMakeLists.txt
index f32c6e08..28d950d4 100644
--- a/unittests/CMakeLists.txt
+++ b/unittests/CMakeLists.txt
@@ -27,5 +27,6 @@ add_subdirectory(cfdp)
 add_subdirectory(hal)
 add_subdirectory(internalerror)
 add_subdirectory(devicehandler)
+add_subdirectory(tmtcservices)
 
 target_include_directories(${FSFW_TEST_TGT} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/unittests/mocks/SimpleSerializable.h b/unittests/mocks/SimpleSerializable.h
index 5c28a09a..222f1729 100644
--- a/unittests/mocks/SimpleSerializable.h
+++ b/unittests/mocks/SimpleSerializable.h
@@ -1,8 +1,8 @@
 #ifndef FSFW_TESTS_SIMPLESERIALIZABLE_H
 #define FSFW_TESTS_SIMPLESERIALIZABLE_H
 
-#include "fsfw/serialize.h"
 #include "fsfw/osal/Endiness.h"
+#include "fsfw/serialize.h"
 
 class SimpleSerializable : public SerializeIF {
  public:
diff --git a/unittests/serialize/testSerializeIF.cpp b/unittests/serialize/testSerializeIF.cpp
index 2cbe6132..968d2b1e 100644
--- a/unittests/serialize/testSerializeIF.cpp
+++ b/unittests/serialize/testSerializeIF.cpp
@@ -13,7 +13,8 @@ TEST_CASE("Serialize IF Serialize", "[serialize-if-ser]") {
   size_t len = 0;
 
   SECTION("Little Endian Normal") {
-    REQUIRE(simpleSer.serialize(&ptr, &len, buf.size(), SerializeIF::Endianness::LITTLE) == HasReturnvaluesIF::RETURN_OK);
+    REQUIRE(simpleSer.serialize(&ptr, &len, buf.size(), SerializeIF::Endianness::LITTLE) ==
+            HasReturnvaluesIF::RETURN_OK);
     CHECK(buf[0] == 1);
     CHECK(buf[1] == 3);
     CHECK(buf[2] == 2);
@@ -23,7 +24,9 @@ TEST_CASE("Serialize IF Serialize", "[serialize-if-ser]") {
   }
 
   SECTION("Little Endian Simple") {
-    REQUIRE(simpleSer.SerializeIF::serialize(buf.data(), buf.size(), SerializeIF::Endianness::LITTLE) == HasReturnvaluesIF::RETURN_OK);
+    REQUIRE(
+        simpleSer.SerializeIF::serialize(buf.data(), buf.size(), SerializeIF::Endianness::LITTLE) ==
+        HasReturnvaluesIF::RETURN_OK);
     CHECK(buf[0] == 1);
     CHECK(buf[1] == 3);
     CHECK(buf[2] == 2);
@@ -35,7 +38,8 @@ TEST_CASE("Serialize IF Serialize", "[serialize-if-ser]") {
               HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 0") {
-      REQUIRE(simpleSer.serialize(&ptr, &len, buf.size(), SerializeIF::Endianness::NETWORK) == HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(simpleSer.serialize(&ptr, &len, buf.size(), SerializeIF::Endianness::NETWORK) ==
+              HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 1") {
       REQUIRE(simpleSer.serializeNe(&ptr, &len, buf.size()) == HasReturnvaluesIF::RETURN_OK);
@@ -51,14 +55,18 @@ TEST_CASE("Serialize IF Serialize", "[serialize-if-ser]") {
 
   SECTION("Big Endian Simple") {
     SECTION("Explicit") {
-      REQUIRE(simpleSer.SerializeIF::serialize(buf.data(), buf.size(), SerializeIF::Endianness::BIG) ==
-              HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(
+          simpleSer.SerializeIF::serialize(buf.data(), buf.size(), SerializeIF::Endianness::BIG) ==
+          HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 0") {
-      REQUIRE(simpleSer.SerializeIF::serialize(buf.data(), buf.size(), SerializeIF::Endianness::NETWORK) == HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(simpleSer.SerializeIF::serialize(buf.data(), buf.size(),
+                                               SerializeIF::Endianness::NETWORK) ==
+              HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 1") {
-      REQUIRE(simpleSer.SerializeIF::serializeNe(buf.data(), buf.size()) == HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(simpleSer.SerializeIF::serializeNe(buf.data(), buf.size()) ==
+              HasReturnvaluesIF::RETURN_OK);
     }
     CHECK(buf[0] == 1);
     CHECK(buf[1] == 2);
@@ -102,7 +110,8 @@ TEST_CASE("SerializeIF Deserialize", "[serialize-if-de]") {
   size_t len = buf.size();
 
   SECTION("Little Endian Normal") {
-    REQUIRE(simpleSer.deSerialize(&ptr, &len, SerializeIF::Endianness::LITTLE) == HasReturnvaluesIF::RETURN_OK);
+    REQUIRE(simpleSer.deSerialize(&ptr, &len, SerializeIF::Endianness::LITTLE) ==
+            HasReturnvaluesIF::RETURN_OK);
     CHECK(simpleSer.getU8() == 5);
     CHECK(simpleSer.getU16() == 0x0100);
     CHECK(ptr == buf.data() + 3);
@@ -110,17 +119,20 @@ TEST_CASE("SerializeIF Deserialize", "[serialize-if-de]") {
   }
 
   SECTION("Little Endian Simple") {
-    REQUIRE(simpleSer.SerializeIF::deSerialize(ptr, len, SerializeIF::Endianness::LITTLE) == HasReturnvaluesIF::RETURN_OK);
+    REQUIRE(simpleSer.SerializeIF::deSerialize(ptr, len, SerializeIF::Endianness::LITTLE) ==
+            HasReturnvaluesIF::RETURN_OK);
     CHECK(simpleSer.getU8() == 5);
     CHECK(simpleSer.getU16() == 0x0100);
   }
 
   SECTION("Big Endian Normal") {
     SECTION("Explicit") {
-      REQUIRE(simpleSer.deSerialize(&ptr, &len, SerializeIF::Endianness::BIG) == HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(simpleSer.deSerialize(&ptr, &len, SerializeIF::Endianness::BIG) ==
+              HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 0") {
-      REQUIRE(simpleSer.deSerialize(&ptr, &len, SerializeIF::Endianness::NETWORK) == HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(simpleSer.deSerialize(&ptr, &len, SerializeIF::Endianness::NETWORK) ==
+              HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 1") {
       REQUIRE(simpleSer.SerializeIF::deSerializeNe(&ptr, &len) == HasReturnvaluesIF::RETURN_OK);
@@ -133,14 +145,18 @@ TEST_CASE("SerializeIF Deserialize", "[serialize-if-de]") {
 
   SECTION("Big Endian Simple") {
     SECTION("Explicit") {
-      REQUIRE(simpleSer.SerializeIF::deSerialize(buf.data(), buf.size(), SerializeIF::Endianness::BIG) ==
+      REQUIRE(simpleSer.SerializeIF::deSerialize(buf.data(), buf.size(),
+                                                 SerializeIF::Endianness::BIG) ==
               HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 0") {
-      REQUIRE(simpleSer.SerializeIF::deSerialize(buf.data(), buf.size(), SerializeIF::Endianness::NETWORK) == HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(simpleSer.SerializeIF::deSerialize(buf.data(), buf.size(),
+                                                 SerializeIF::Endianness::NETWORK) ==
+              HasReturnvaluesIF::RETURN_OK);
     }
     SECTION("Network 1") {
-      REQUIRE(simpleSer.SerializeIF::deSerializeNe(buf.data(), buf.size()) == HasReturnvaluesIF::RETURN_OK);
+      REQUIRE(simpleSer.SerializeIF::deSerializeNe(buf.data(), buf.size()) ==
+              HasReturnvaluesIF::RETURN_OK);
     }
     CHECK(simpleSer.getU8() == 5);
     CHECK(simpleSer.getU16() == 1);
diff --git a/unittests/tmtcpacket/testCcsds.cpp b/unittests/tmtcpacket/testCcsds.cpp
index 1bae5912..16883458 100644
--- a/unittests/tmtcpacket/testCcsds.cpp
+++ b/unittests/tmtcpacket/testCcsds.cpp
@@ -1,7 +1,9 @@
 #include <array>
 #include <catch2/catch_test_macros.hpp>
+#include <cmath>
 
 #include "fsfw/tmtcpacket/ccsds/PacketId.h"
+#include "fsfw/tmtcpacket/ccsds/PacketSeqCtrl.h"
 #include "fsfw/tmtcpacket/ccsds/header.h"
 
 TEST_CASE("CCSDS Low Level", "[ccsds-ll]") {
@@ -43,16 +45,73 @@ TEST_CASE("CCSDS Packet ID", "[ccsds-packet-id]") {
     REQUIRE(packetId.raw() == 0x1ff);
     REQUIRE(packetId.SerializeIF::serializeNe(buf.data(), buf.size()) ==
             HasReturnvaluesIF::RETURN_OK);
-    REQUIRE(buf[0] == 0x1);
-    REQUIRE(buf[1] == 0xff);
+    CHECK(buf[0] == 0x1);
+    CHECK(buf[1] == 0xff);
+  }
+
+  SECTION("Invalid Ser") {
+    REQUIRE(packetId.SerializeIF::serializeNe(buf.data(), 0) == SerializeIF::BUFFER_TOO_SHORT);
+    REQUIRE(packetId.SerializeIF::serializeNe(buf.data(), 1) == SerializeIF::BUFFER_TOO_SHORT);
+  }
+
+  SECTION("Invalid Deser") {
+    REQUIRE(packetId.SerializeIF::deSerialize(buf.data(), 1) == SerializeIF::STREAM_TOO_SHORT);
+    REQUIRE(packetId.SerializeIF::deSerialize(buf.data(), 0) == SerializeIF::STREAM_TOO_SHORT);
   }
 
   SECTION("From Raw") {
     auto newId = PacketId(ccsds::PacketType::TC, true, 0x2ff);
     uint16_t rawId = newId.raw();
-    REQUIRE(rawId == 0x1aff);
-    REQUIRE(PacketId::fromRaw(rawId) == newId);
+    CHECK(rawId == 0x1aff);
+    CHECK(PacketId::fromRaw(rawId) == newId);
+  }
+
+  SECTION("Deserialize") {
+    buf[0] = 0x1a;
+    buf[1] = 0xff;
+    REQUIRE(packetId.SerializeIF::deSerialize(buf.data(), buf.size()) ==
+            HasReturnvaluesIF::RETURN_OK);
+    CHECK(packetId.apid == 0x2ff);
+    CHECK(packetId.packetType == ccsds::PacketType::TC);
+    CHECK(packetId.secHeaderFlag == true);
   }
 }
 
-TEST_CASE("CCSDS Packet Seq Ctrl", "[ccsds-packet-seq-ctrl]") {}
+TEST_CASE("CCSDS Packet Seq Ctrl", "[ccsds-packet-seq-ctrl]") {
+  PacketSeqCtrl psc;
+  std::array<uint8_t, 3> buf{};
+  SECTION("Basic") {
+    psc.seqFlags = ccsds::SequenceFlags::FIRST_SEGMENT;
+    psc.seqCount = static_cast<uint16_t>(std::round(std::pow(2, 14) - 1));
+    REQUIRE(psc.raw() == 0x7fff);
+    REQUIRE(psc.SerializeIF::serializeNe(buf.data(), buf.size()) == HasReturnvaluesIF::RETURN_OK);
+    CHECK(buf[0] == 0x7f);
+    CHECK(buf[1] == 0xff);
+  }
+
+  SECTION("From Raw") {
+    auto newId = PacketSeqCtrl(ccsds::SequenceFlags::LAST_SEGMENT,
+                               static_cast<uint16_t>(std::round(std::pow(2, 14) - 2)));
+    uint16_t rawId = newId.raw();
+    REQUIRE(rawId == 0xbffe);
+    CHECK(PacketSeqCtrl::fromRaw(rawId) == newId);
+  }
+
+  SECTION("Deserialize") {
+    buf[0] = 0xbf;
+    buf[1] = 0xfe;
+    REQUIRE(psc.SerializeIF::deSerialize(buf.data(), buf.size()) == HasReturnvaluesIF::RETURN_OK);
+    CHECK(psc.seqFlags == ccsds::SequenceFlags::LAST_SEGMENT);
+    CHECK(psc.seqCount == static_cast<uint16_t>(std::round(std::pow(2, 14) - 2)));
+  }
+
+  SECTION("Invalid Ser") {
+    REQUIRE(psc.SerializeIF::serializeNe(buf.data(), 0) == SerializeIF::BUFFER_TOO_SHORT);
+    REQUIRE(psc.SerializeIF::serializeNe(buf.data(), 1) == SerializeIF::BUFFER_TOO_SHORT);
+  }
+
+  SECTION("Invalid Deser") {
+    REQUIRE(psc.SerializeIF::deSerialize(buf.data(), 1) == SerializeIF::STREAM_TOO_SHORT);
+    REQUIRE(psc.SerializeIF::deSerialize(buf.data(), 0) == SerializeIF::STREAM_TOO_SHORT);
+  }
+}
diff --git a/unittests/tmtcpacket/testCcsdsCreator.cpp b/unittests/tmtcpacket/testCcsdsCreator.cpp
index 91122ef9..570e791b 100644
--- a/unittests/tmtcpacket/testCcsdsCreator.cpp
+++ b/unittests/tmtcpacket/testCcsdsCreator.cpp
@@ -5,8 +5,9 @@
 #include "fsfw/tmtcpacket/ccsds/SpacePacketCreator.h"
 
 TEST_CASE("CCSDS Creator", "[ccsds-creator]") {
-  auto params = SpacePacketParams(PacketId(ccsds::PacketType::TC, true, 0x02),
-                                  PacketSeqCtrl(ccsds::SequenceFlags::FIRST_SEGMENT, 0x34), 0x16);
+  auto packetId = PacketId(ccsds::PacketType::TC, true, 0x02);
+  auto psc = PacketSeqCtrl(ccsds::SequenceFlags::FIRST_SEGMENT, 0x34);
+  auto params = SpacePacketParams(packetId, psc, 0x16);
   SpacePacketCreator base = SpacePacketCreator(params);
   std::array<uint8_t, 6> buf{};
   uint8_t* bufPtr = buf.data();
@@ -21,15 +22,18 @@ TEST_CASE("CCSDS Creator", "[ccsds-creator]") {
   }
 
   SECTION("Basic Test") {
-    REQUIRE(base.isValid());
-    REQUIRE(base.getApid() == 0x02);
-    REQUIRE(base.getSequenceFlags() == ccsds::SequenceFlags::FIRST_SEGMENT);
-    REQUIRE(base.getVersion() == 0b000);
-    REQUIRE(base.getSequenceCount() == 0x34);
-    REQUIRE(base.getPacketDataLen() == 0x16);
-    REQUIRE(base.getPacketType() == ccsds::PacketType::TC);
-    REQUIRE(base.getPacketIdRaw() == 0x1802);
-    REQUIRE(base.getSerializedSize() == 6);
+    CHECK(base.isValid());
+    CHECK(base);
+    CHECK(base.getApid() == 0x02);
+    CHECK(base.getSequenceFlags() == ccsds::SequenceFlags::FIRST_SEGMENT);
+    CHECK(base.getVersion() == 0b000);
+    CHECK(base.getSequenceCount() == 0x34);
+    CHECK(base.getPacketDataLen() == 0x16);
+    CHECK(base.getPacketType() == ccsds::PacketType::TC);
+    CHECK(base.getPacketIdRaw() == 0x1802);
+    CHECK(base.getSerializedSize() == 6);
+    CHECK(base.getPacketSeqCtrl() == psc);
+    CHECK(base.getPacketId() == packetId);
   }
 
   SECTION("Deserialization Fails") {
@@ -42,18 +46,18 @@ TEST_CASE("CCSDS Creator", "[ccsds-creator]") {
   SECTION("Raw Output") {
     REQUIRE(base.serializeNe(&bufPtr, &serLen, buf.size()) == HasReturnvaluesIF::RETURN_OK);
     // TC, and secondary header flag is set -> 0b0001100 -> 0x18
-    REQUIRE(buf[0] == 0x18);
+    CHECK(buf[0] == 0x18);
     // APID 0x02
-    REQUIRE(buf[1] == 0x02);
+    CHECK(buf[1] == 0x02);
     // Sequence count is one byte value, so the only set bit here is the bit
     // from the Sequence flag argument, which is the second bit for
     // SequenceFlags.FIRST_SEGMENT
-    REQUIRE(buf[2] == 0x40);
+    CHECK(buf[2] == 0x40);
     // Sequence Count specified above
-    REQUIRE(buf[3] == 0x34);
+    CHECK(buf[3] == 0x34);
     // This byte and the next byte should be 22 big endian (packet length)
-    REQUIRE(buf[4] == 0x00);
-    REQUIRE(buf[5] == 0x16);
+    CHECK(buf[4] == 0x00);
+    CHECK(buf[5] == 0x16);
   }
 
   SECTION("All Ones Output") {
@@ -63,19 +67,20 @@ TEST_CASE("CCSDS Creator", "[ccsds-creator]") {
     base.setDataLen(static_cast<int>(std::pow(2, 16)) - 1);
     REQUIRE(base.isValid());
     REQUIRE(base.serializeNe(&bufPtr, &serLen, buf.size()) == HasReturnvaluesIF::RETURN_OK);
-    REQUIRE(buf[0] == 0x1F);
-    REQUIRE(buf[1] == 0xFF);
-    REQUIRE(buf[2] == 0xFF);
-    REQUIRE(buf[3] == 0xFF);
-    REQUIRE(buf[4] == 0xFF);
-    REQUIRE(buf[5] == 0xFF);
+    CHECK(buf[0] == 0x1F);
+    CHECK(buf[1] == 0xFF);
+    CHECK(buf[2] == 0xFF);
+    CHECK(buf[3] == 0xFF);
+    CHECK(buf[4] == 0xFF);
+    CHECK(buf[5] == 0xFF);
   }
 
   SECTION("Invalid APID") {
-    SpacePacketCreator invalid = SpacePacketCreator(
+    SpacePacketCreator creator = SpacePacketCreator(
         ccsds::PacketType::TC, true, 0xFFFF, ccsds::SequenceFlags::FIRST_SEGMENT, 0x34, 0x16);
-    REQUIRE(not invalid.isValid());
-    REQUIRE(invalid.serializeNe(&bufPtr, &serLen, buf.size()) == HasReturnvaluesIF::RETURN_FAILED);
+    REQUIRE(not creator.isValid());
+    REQUIRE(not creator);
+    REQUIRE(creator.serializeNe(&bufPtr, &serLen, buf.size()) == HasReturnvaluesIF::RETURN_FAILED);
   }
 
   SECTION("Invalid Seq Count") {
diff --git a/unittests/tmtcservices/CMakeLists.txt b/unittests/tmtcservices/CMakeLists.txt
new file mode 100644
index 00000000..5d1c1858
--- /dev/null
+++ b/unittests/tmtcservices/CMakeLists.txt
@@ -0,0 +1,2 @@
+target_sources(${FSFW_TEST_TGT} PRIVATE
+)
diff --git a/unittests/tmtcservices/testStoreHelper.cpp b/unittests/tmtcservices/testStoreHelper.cpp
new file mode 100644
index 00000000..0374ece5
--- /dev/null
+++ b/unittests/tmtcservices/testStoreHelper.cpp
@@ -0,0 +1,3 @@
+#include <catch2/catch_test_macros.hpp>
+
+TEST_CASE("TM Store Helper", "[tm-store-helper]") {}
\ No newline at end of file