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diff --git a/test/message/pack.cpp b/test/message/pack.cpp
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+++ b/test/message/pack.cpp
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+/**
+ * Copyright © 2018 Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <ipmid/api.hpp>
+#include <ipmid/message.hpp>
+
+#include <gtest/gtest.h>
+
+// TODO: Add testing of Payload response API
+
+TEST(PackBasics, Uint8)
+{
+    ipmi::message::Payload p;
+    uint8_t v = 4;
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(v));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x04};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Uint16)
+{
+    ipmi::message::Payload p;
+    uint16_t v = 0x8604;
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(v));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x04, 0x86};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Uint32)
+{
+    ipmi::message::Payload p;
+    uint32_t v = 0x02008604;
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(v));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x04, 0x86, 0x00, 0x02};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Uint64)
+{
+    ipmi::message::Payload p;
+    uint64_t v = 0x1122334402008604ull;
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(v));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x04, 0x86, 0x00, 0x02, 0x44, 0x33, 0x22, 0x11};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Uint24)
+{
+    ipmi::message::Payload p;
+    uint24_t v = 0x112358;
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), types::nrFixedBits<decltype(v)> / CHAR_BIT);
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x58, 0x23, 0x11};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Uint3Uint5)
+{
+    // individual bytes are packed low-order-bits first
+    // v1 will occupy [2:0], v2 will occupy [7:3]
+    ipmi::message::Payload p;
+    uint3_t v1 = 0x1;
+    uint5_t v2 = 0x19;
+    p.pack(v1, v2);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), (types::nrFixedBits<decltype(v1)> +
+                         types::nrFixedBits<decltype(v2)>) /
+                            CHAR_BIT);
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0xc9};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Boolx8)
+{
+    // individual bytes are packed low-order-bits first
+    // [v8, v7, v6, v5, v4, v3, v2, v1]
+    ipmi::message::Payload p;
+    bool v8 = true, v7 = true, v6 = false, v5 = false;
+    bool v4 = true, v3 = false, v2 = false, v1 = true;
+    p.pack(v1, v2, v3, v4, v5, v6, v7, v8);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(uint8_t));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0xc9};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Bitset8)
+{
+    // individual bytes are packed low-order-bits first
+    // a bitset for 8 bits fills the full byte
+    ipmi::message::Payload p;
+    std::bitset<8> v(0xc9);
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), v.size() / CHAR_BIT);
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0xc9};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Bitset3Bitset5)
+{
+    // individual bytes are packed low-order-bits first
+    // v1 will occupy [2:0], v2 will occupy [7:3]
+    ipmi::message::Payload p;
+    std::bitset<3> v1(0x1);
+    std::bitset<5> v2(0x19);
+    p.pack(v1, v2);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), (v1.size() + v2.size()) / CHAR_BIT);
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0xc9};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Bitset32)
+{
+    // individual bytes are packed low-order-bits first
+    // v1 will occupy 4 bytes, but in LSByte first order
+    // v1[7:0] v1[15:9] v1[23:16] v1[31:24]
+    ipmi::message::Payload p;
+    std::bitset<32> v(0x02008604);
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), v.size() / CHAR_BIT);
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x04, 0x86, 0x00, 0x02};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Array4xUint8)
+{
+    // an array of bytes will be output verbatim, low-order element first
+    ipmi::message::Payload p;
+    std::array<uint8_t, 4> v = {{0x02, 0x00, 0x86, 0x04}};
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), v.size() * sizeof(v[0]));
+    // check that the bytes were correctly packed (in byte order)
+    std::vector<uint8_t> k = {0x02, 0x00, 0x86, 0x04};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, Array4xUint32)
+{
+    // an array of multi-byte values will be output in order low-order
+    // element first, each multi-byte element in LSByte order
+    // v[0][7:0] v[0][15:9] v[0][23:16] v[0][31:24]
+    // v[1][7:0] v[1][15:9] v[1][23:16] v[1][31:24]
+    // v[2][7:0] v[2][15:9] v[2][23:16] v[2][31:24]
+    // v[3][7:0] v[3][15:9] v[3][23:16] v[3][31:24]
+    ipmi::message::Payload p;
+    std::array<uint32_t, 4> v = {
+        {0x11223344, 0x22446688, 0x33557799, 0x12345678}};
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), v.size() * sizeof(v[0]));
+    // check that the bytes were correctly packed (in byte order)
+    std::vector<uint8_t> k = {0x44, 0x33, 0x22, 0x11, 0x88, 0x66, 0x44, 0x22,
+                              0x99, 0x77, 0x55, 0x33, 0x78, 0x56, 0x34, 0x12};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, VectorUint32)
+{
+    // a vector of multi-byte values will be output in order low-order
+    // element first, each multi-byte element in LSByte order
+    // v[0][7:0] v[0][15:9] v[0][23:16] v[0][31:24]
+    // v[1][7:0] v[1][15:9] v[1][23:16] v[1][31:24]
+    // v[2][7:0] v[2][15:9] v[2][23:16] v[2][31:24]
+    // v[3][7:0] v[3][15:9] v[3][23:16] v[3][31:24]
+    ipmi::message::Payload p;
+    std::vector<uint32_t> v = {
+        {0x11223344, 0x22446688, 0x33557799, 0x12345678}};
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), v.size() * sizeof(v[0]));
+    // check that the bytes were correctly packed (in byte order)
+    std::vector<uint8_t> k = {0x44, 0x33, 0x22, 0x11, 0x88, 0x66, 0x44, 0x22,
+                              0x99, 0x77, 0x55, 0x33, 0x78, 0x56, 0x34, 0x12};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackBasics, VectorUint8)
+{
+    // a vector of bytes will be output verbatim, low-order element first
+    ipmi::message::Payload p;
+    std::vector<uint8_t> v = {0x02, 0x00, 0x86, 0x04};
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), v.size() * sizeof(v[0]));
+    // check that the bytes were correctly packed (in byte order)
+    std::vector<uint8_t> k = {0x02, 0x00, 0x86, 0x04};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackAdvanced, Uints)
+{
+    // all elements will be processed in order, with each multi-byte
+    // element being processed LSByte first
+    // v1[7:0] v2[7:0] v2[15:8] v3[7:0] v3[15:8] v3[23:16] v3[31:24]
+    // v4[7:0] v4[15:8] v4[23:16] v4[31:24]
+    // v4[39:25] v4[47:40] v4[55:48] v4[63:56]
+    ipmi::message::Payload p;
+    uint8_t v1 = 0x02;
+    uint16_t v2 = 0x0604;
+    uint32_t v3 = 0x44332211;
+    uint64_t v4 = 0xccbbaa9988776655ull;
+    p.pack(v1, v2, v3, v4);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(v1) + sizeof(v2) + sizeof(v3) + sizeof(v4));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x02, 0x04, 0x06, 0x11, 0x22, 0x33, 0x44, 0x55,
+                              0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackAdvanced, TupleInts)
+{
+    // all elements will be processed in order, with each multi-byte
+    // element being processed LSByte first
+    // v1[7:0] v2[7:0] v2[15:8] v3[7:0] v3[15:8] v3[23:16] v3[31:24]
+    // v4[7:0] v4[15:8] v4[23:16] v4[31:24]
+    // v4[39:25] v4[47:40] v4[55:48] v4[63:56]
+    ipmi::message::Payload p;
+    uint8_t v1 = 0x02;
+    uint16_t v2 = 0x0604;
+    uint32_t v3 = 0x44332211;
+    uint64_t v4 = 0xccbbaa9988776655ull;
+    auto v = std::make_tuple(v1, v2, v3, v4);
+    p.pack(v);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(v1) + sizeof(v2) + sizeof(v3) + sizeof(v4));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x02, 0x04, 0x06, 0x11, 0x22, 0x33, 0x44, 0x55,
+                              0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackAdvanced, BoolsnBitfieldsnFixedIntsOhMy)
+{
+    // each element will be added, filling the low-order bits first
+    // with multi-byte values getting added LSByte first
+    // v1 will occupy k[0][1:0]
+    // v2 will occupy k[0][2]
+    // v3[4:0] will occupy k[0][7:3], v3[6:5] will occupy k[1][1:0]
+    // v4 will occupy k[1][2]
+    // v5 will occupy k[1][7:3]
+    ipmi::message::Payload p;
+    uint2_t v1 = 2;          // binary 0b10
+    bool v2 = true;          // binary 0b1
+    std::bitset<7> v3(0x73); // binary 0b1110011
+    bool v4 = false;         // binary 0b0
+    uint5_t v5 = 27;         // binary 0b11011
+    // concat binary: 0b1101101110011110 -> 0xdb9e -> 0x9e 0xdb (LSByte first)
+    p.pack(v1, v2, v3, v4, v5);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(uint16_t));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x9e, 0xdb};
+    ASSERT_EQ(p.raw, k);
+}
+
+TEST(PackAdvanced, UnalignedBitPacking)
+{
+    // unaligned multi-byte values will be packed the same as
+    // other bits, effectively building up a large value, low-order
+    // bits first, then outputting a stream of LSByte values
+    // v1 will occupy k[0][1:0]
+    // v2[5:0] will occupy k[0][7:2], v2[7:6] will occupy k[1][1:0]
+    // v3 will occupy k[1][2]
+    // v4[4:0] will occupy k[1][7:3] v4[12:5] will occupy k[2][7:0]
+    // v4[15:13] will occupy k[3][2:0]
+    // v5 will occupy k[3][3]
+    // v6[3:0] will occupy k[3][7:0] v6[11:4] will occupy k[4][7:0]
+    // v6[19:12] will occupy k[5][7:0] v6[27:20] will occupy k[6][7:0]
+    // v6[31:28] will occupy k[7][3:0]
+    // v7 will occupy k[7][7:4]
+    ipmi::message::Payload p;
+    uint2_t v1 = 2;           // binary 0b10
+    uint8_t v2 = 0xa5;        // binary 0b10100101
+    bool v3 = false;          // binary 0b0
+    uint16_t v4 = 0xa55a;     // binary 0b1010010101011010
+    bool v5 = true;           // binary 0b1
+    uint32_t v6 = 0xdbc3bd3c; // binary 0b11011011110000111011110100111100
+    uint4_t v7 = 9;           // binary 0b1001
+    // concat binary:
+    //   0b1001110110111100001110111101001111001101001010101101001010010110
+    //   -> 0x9dbc3bd3cd2ad296 -> 0x96 0xd2 0x2a 0xcd 0xd3 0x3b 0xbc 0x9d
+    p.pack(v1, v2, v3, v4, v5, v6, v7);
+    // check that the number of bytes matches
+    ASSERT_EQ(p.size(), sizeof(uint64_t));
+    // check that the bytes were correctly packed (LSB first)
+    std::vector<uint8_t> k = {0x96, 0xd2, 0x2a, 0xcd, 0xd3, 0x3b, 0xbc, 0x9d};
+    ASSERT_EQ(p.raw, k);
+}