diff --git a/src/test/txpackage_tests.cpp b/src/test/txpackage_tests.cpp
index 6c996c2630f..086219de14c 100644
--- a/src/test/txpackage_tests.cpp
+++ b/src/test/txpackage_tests.cpp
@@ -207,4 +207,124 @@ BOOST_FIXTURE_TEST_CASE(noncontextual_package_tests, TestChain100Setup)
     }
 }
 
+BOOST_FIXTURE_TEST_CASE(package_submission_tests, TestChain100Setup)
+{
+    LOCK(cs_main);
+    unsigned int expected_pool_size = m_node.mempool->size();
+    CKey parent_key;
+    parent_key.MakeNewKey(true);
+    CScript parent_locking_script = GetScriptForDestination(PKHash(parent_key.GetPubKey()));
+
+    // Unrelated transactions are not allowed in package submission.
+    Package package_unrelated;
+    for (size_t i{0}; i < 10; ++i) {
+        auto mtx = CreateValidMempoolTransaction(/* input_transaction */ m_coinbase_txns[i + 25], /* vout */ 0,
+                                                 /* input_height */ 0, /* input_signing_key */ coinbaseKey,
+                                                 /* output_destination */ parent_locking_script,
+                                                 /* output_amount */ CAmount(49 * COIN), /* submit */ false);
+        package_unrelated.emplace_back(MakeTransactionRef(mtx));
+    }
+    auto result_unrelated_submit = ProcessNewPackage(m_node.chainman->ActiveChainstate(), *m_node.mempool,
+                                                     package_unrelated, /* test_accept */ false);
+    BOOST_CHECK(result_unrelated_submit.m_state.IsInvalid());
+    BOOST_CHECK_EQUAL(result_unrelated_submit.m_state.GetResult(), PackageValidationResult::PCKG_POLICY);
+    BOOST_CHECK_EQUAL(result_unrelated_submit.m_state.GetRejectReason(), "package-not-child-with-parents");
+    BOOST_CHECK_EQUAL(m_node.mempool->size(), expected_pool_size);
+
+    // Parent and Child (and Grandchild) Package
+    Package package_parent_child;
+    Package package_3gen;
+    auto mtx_parent = CreateValidMempoolTransaction(/* input_transaction */ m_coinbase_txns[0], /* vout */ 0,
+                                                    /* input_height */ 0, /* input_signing_key */ coinbaseKey,
+                                                    /* output_destination */ parent_locking_script,
+                                                    /* output_amount */ CAmount(49 * COIN), /* submit */ false);
+    CTransactionRef tx_parent = MakeTransactionRef(mtx_parent);
+    package_parent_child.push_back(tx_parent);
+    package_3gen.push_back(tx_parent);
+
+    CKey child_key;
+    child_key.MakeNewKey(true);
+    CScript child_locking_script = GetScriptForDestination(PKHash(child_key.GetPubKey()));
+    auto mtx_child = CreateValidMempoolTransaction(/* input_transaction */ tx_parent, /* vout */ 0,
+                                                   /* input_height */ 101, /* input_signing_key */ parent_key,
+                                                   /* output_destination */ child_locking_script,
+                                                   /* output_amount */ CAmount(48 * COIN), /* submit */ false);
+    CTransactionRef tx_child = MakeTransactionRef(mtx_child);
+    package_parent_child.push_back(tx_child);
+    package_3gen.push_back(tx_child);
+
+    CKey grandchild_key;
+    grandchild_key.MakeNewKey(true);
+    CScript grandchild_locking_script = GetScriptForDestination(PKHash(grandchild_key.GetPubKey()));
+    auto mtx_grandchild = CreateValidMempoolTransaction(/* input_transaction */ tx_child, /* vout */ 0,
+                                                       /* input_height */ 101, /* input_signing_key */ child_key,
+                                                       /* output_destination */ grandchild_locking_script,
+                                                       /* output_amount */ CAmount(47 * COIN), /* submit */ false);
+    CTransactionRef tx_grandchild = MakeTransactionRef(mtx_grandchild);
+    package_3gen.push_back(tx_grandchild);
+
+    // 3 Generations is not allowed.
+    {
+        auto result_3gen_submit = ProcessNewPackage(m_node.chainman->ActiveChainstate(), *m_node.mempool,
+                                                    package_3gen, /* test_accept */ false);
+        BOOST_CHECK(result_3gen_submit.m_state.IsInvalid());
+        BOOST_CHECK_EQUAL(result_3gen_submit.m_state.GetResult(), PackageValidationResult::PCKG_POLICY);
+        BOOST_CHECK_EQUAL(result_3gen_submit.m_state.GetRejectReason(), "package-not-child-with-parents");
+        BOOST_CHECK_EQUAL(m_node.mempool->size(), expected_pool_size);
+    }
+
+    // Child with missing parent.
+    mtx_child.vin.push_back(CTxIn(COutPoint(package_unrelated[0]->GetHash(), 0)));
+    Package package_missing_parent;
+    package_missing_parent.push_back(tx_parent);
+    package_missing_parent.push_back(MakeTransactionRef(mtx_child));
+    {
+        const auto result_missing_parent = ProcessNewPackage(m_node.chainman->ActiveChainstate(), *m_node.mempool,
+                                                             package_missing_parent, /* test_accept */ false);
+        BOOST_CHECK(result_missing_parent.m_state.IsInvalid());
+        BOOST_CHECK_EQUAL(result_missing_parent.m_state.GetResult(), PackageValidationResult::PCKG_POLICY);
+        BOOST_CHECK_EQUAL(result_missing_parent.m_state.GetRejectReason(), "package-not-child-with-unconfirmed-parents");
+        BOOST_CHECK_EQUAL(m_node.mempool->size(), expected_pool_size);
+
+    }
+
+    // Submit package with parent + child.
+    {
+        const auto submit_parent_child = ProcessNewPackage(m_node.chainman->ActiveChainstate(), *m_node.mempool,
+                                                           package_parent_child, /* test_accept */ false);
+        expected_pool_size += 2;
+        BOOST_CHECK_MESSAGE(submit_parent_child.m_state.IsValid(),
+                            "Package validation unexpectedly failed: " << submit_parent_child.m_state.GetRejectReason());
+        auto it_parent = submit_parent_child.m_tx_results.find(tx_parent->GetWitnessHash());
+        auto it_child = submit_parent_child.m_tx_results.find(tx_child->GetWitnessHash());
+        BOOST_CHECK(it_parent != submit_parent_child.m_tx_results.end());
+        BOOST_CHECK(it_parent->second.m_state.IsValid());
+        BOOST_CHECK(it_child != submit_parent_child.m_tx_results.end());
+        BOOST_CHECK(it_child->second.m_state.IsValid());
+
+        BOOST_CHECK_EQUAL(m_node.mempool->size(), expected_pool_size);
+        BOOST_CHECK(m_node.mempool->exists(GenTxid::Txid(tx_parent->GetHash())));
+        BOOST_CHECK(m_node.mempool->exists(GenTxid::Txid(tx_child->GetHash())));
+    }
+
+    // Already-in-mempool transactions should be detected and de-duplicated.
+    {
+        const auto submit_deduped = ProcessNewPackage(m_node.chainman->ActiveChainstate(), *m_node.mempool,
+                                                      package_parent_child, /* test_accept */ false);
+        BOOST_CHECK_MESSAGE(submit_deduped.m_state.IsValid(),
+                            "Package validation unexpectedly failed: " << submit_deduped.m_state.GetRejectReason());
+        auto it_parent_deduped = submit_deduped.m_tx_results.find(tx_parent->GetWitnessHash());
+        auto it_child_deduped = submit_deduped.m_tx_results.find(tx_child->GetWitnessHash());
+        BOOST_CHECK(it_parent_deduped != submit_deduped.m_tx_results.end());
+        BOOST_CHECK(it_parent_deduped->second.m_state.IsValid());
+        BOOST_CHECK(it_parent_deduped->second.m_result_type == MempoolAcceptResult::ResultType::MEMPOOL_ENTRY);
+        BOOST_CHECK(it_child_deduped != submit_deduped.m_tx_results.end());
+        BOOST_CHECK(it_child_deduped->second.m_state.IsValid());
+        BOOST_CHECK(it_child_deduped->second.m_result_type == MempoolAcceptResult::ResultType::MEMPOOL_ENTRY);
+
+        BOOST_CHECK_EQUAL(m_node.mempool->size(), expected_pool_size);
+        BOOST_CHECK(m_node.mempool->exists(GenTxid::Txid(tx_parent->GetHash())));
+        BOOST_CHECK(m_node.mempool->exists(GenTxid::Txid(tx_child->GetHash())));
+    }
+}
 BOOST_AUTO_TEST_SUITE_END()