diff --git a/test/resolution_test.cpp b/test/resolution_test.cpp
new file mode 100644
index 0000000..61e0b35
--- /dev/null
+++ b/test/resolution_test.cpp
@@ -0,0 +1,152 @@
+#include <stdio.h>
+
+#include <analyzer/resolution.hpp>
+
+#include "gtest/gtest.h"
+
+// Chip string
+constexpr auto chip_str = "/proc0";
+
+// Unit paths
+constexpr auto proc_str = "";
+constexpr auto omi_str  = "pib/perv12/mc0/mi0/mcc0/omi0";
+constexpr auto core_str = "pib/perv39/eq7/fc1/core1";
+
+// Local implementation of this function.
+namespace analyzer
+{
+
+void HardwareCalloutResolution::resolve(ServiceData& io_sd) const
+{
+    auto sig = io_sd.getRootCause();
+
+    std::string fru{(const char*)sig.getChip().getChip()};
+    std::string guard{fru};
+    if (!iv_path.empty())
+    {
+        guard += "/" + iv_path;
+    }
+
+    io_sd.addCallout(std::make_shared<HardwareCallout>(fru, iv_priority));
+
+    io_sd.addGuard(std::make_shared<Guard>(guard, iv_guard));
+}
+
+} // namespace analyzer
+
+using namespace analyzer;
+
+TEST(Resolution, TestSet1)
+{
+    // Create a few resolutions
+    auto c1 = std::make_shared<HardwareCalloutResolution>(
+        proc_str, Callout::Priority::HIGH, Guard::NONE);
+
+    auto c2 = std::make_shared<HardwareCalloutResolution>(
+        omi_str, Callout::Priority::MED_A, Guard::FATAL);
+
+    auto c3 = std::make_shared<HardwareCalloutResolution>(
+        core_str, Callout::Priority::MED, Guard::NON_FATAL);
+
+    auto c4 = std::make_shared<ProcedureCalloutResolution>(
+        ProcedureCallout::NEXTLVL, Callout::Priority::LOW);
+
+    // l3 = (c1, c2, c3, c4)
+    auto l1 = std::make_shared<LinkResolution>(c1, c2);
+    auto l2 = std::make_shared<LinkResolution>(l1, c3);
+    auto l3 = std::make_shared<LinkResolution>(l2, c4);
+
+    // l5 = (c4, c3, c1, c2)
+    auto l4 = std::make_shared<LinkResolution>(c3, l1);
+    auto l5 = std::make_shared<LinkResolution>(c4, l4);
+
+    // Get some ServiceData objects
+    libhei::Chip chip{chip_str, 0xdeadbeef};
+    libhei::Signature sig{chip, 0xabcd, 0, 0, libhei::ATTN_TYPE_CHECKSTOP};
+    ServiceData sd1{sig};
+    ServiceData sd2{sig};
+
+    // Resolve
+    l3->resolve(sd1);
+    l5->resolve(sd2);
+
+    // Start verifying
+    nlohmann::json j{};
+    std::string s{};
+
+    sd1.getCalloutList(j);
+    s = R"([
+    {
+        "LocationCode": "/proc0",
+        "Priority": "H"
+    },
+    {
+        "LocationCode": "/proc0",
+        "Priority": "A"
+    },
+    {
+        "LocationCode": "/proc0",
+        "Priority": "M"
+    },
+    {
+        "Priority": "L",
+        "Procedure": "NEXTLVL"
+    }
+])";
+    ASSERT_EQ(s, j.dump(4));
+
+    sd1.getGuardList(j);
+    s = R"([
+    {
+        "Path": "/proc0",
+        "Type": "NONE"
+    },
+    {
+        "Path": "/proc0/pib/perv12/mc0/mi0/mcc0/omi0",
+        "Type": "FATAL"
+    },
+    {
+        "Path": "/proc0/pib/perv39/eq7/fc1/core1",
+        "Type": "NON_FATAL"
+    }
+])";
+    ASSERT_EQ(s, j.dump(4));
+
+    sd2.getCalloutList(j);
+    s = R"([
+    {
+        "Priority": "L",
+        "Procedure": "NEXTLVL"
+    },
+    {
+        "LocationCode": "/proc0",
+        "Priority": "M"
+    },
+    {
+        "LocationCode": "/proc0",
+        "Priority": "H"
+    },
+    {
+        "LocationCode": "/proc0",
+        "Priority": "A"
+    }
+])";
+    ASSERT_EQ(s, j.dump(4));
+
+    sd2.getGuardList(j);
+    s = R"([
+    {
+        "Path": "/proc0/pib/perv39/eq7/fc1/core1",
+        "Type": "NON_FATAL"
+    },
+    {
+        "Path": "/proc0",
+        "Type": "NONE"
+    },
+    {
+        "Path": "/proc0/pib/perv12/mc0/mi0/mcc0/omi0",
+        "Type": "FATAL"
+    }
+])";
+    ASSERT_EQ(s, j.dump(4));
+}