diff --git a/lua/neotest-pest/init.lua b/lua/neotest-pest/init.lua
index 52d4f12..d3e4e8e 100644
--- a/lua/neotest-pest/init.lua
+++ b/lua/neotest-pest/init.lua
@@ -59,6 +59,69 @@ local is_callable = function(obj)
     return type(obj) == "function" or (type(obj) == "table" and obj.__call)
 end
 
+---@param args neotest.RunArgs
+---@return neotest.RunSpec | nil
+function NeotestAdapter.build_spec(args)
+    local position = args.tree:data()
+    local results_path = async.fn.tempname()
+
+    local binary = get_pest_cmd()
+
+    local command = vim.tbl_flatten({
+        binary,
+        position.name ~= "tests" and position.path,
+        "--log-junit=" .. results_path,
+    })
+
+    if position.type == "test" then
+        local script_args = vim.tbl_flatten({
+            "--filter",
+            position.name,
+        })
+
+        command = vim.tbl_flatten({
+            command,
+            script_args,
+        })
+    end
+
+    return {
+        command = command,
+        context = {
+            results_path = results_path,
+        },
+    }
+end
+
+---@async
+---@param spec neotest.RunSpec
+---@param result neotest.StrategyResult
+---@param tree neotest.Tree
+---@return neotest.Result[]
+function NeotestAdapter.results(test, result, tree)
+  local output_file = test.context.results_path
+
+  local ok, data = pcall(lib.files.read, output_file)
+  if not ok then
+    logger.error("No test output file found:", output_file)
+    return {}
+  end
+
+  local ok, parsed_data = pcall(lib.xml.parse, data)
+  if not ok then
+    logger.error("Failed to parse test output:", output_file)
+    return {}
+  end
+
+  local ok, results = pcall(utils.get_test_results, parsed_data, output_file)
+  if not ok then
+    logger.error("Could not get test results", output_file)
+    return {}
+  end
+
+  return results
+end
+
 setmetatable(NeotestAdapter, {
     __call = function(_, opts)
         if is_callable(opts.pest_cmd) then
diff --git a/lua/neotest-pest/utils.lua b/lua/neotest-pest/utils.lua
new file mode 100644
index 0000000..bd2a75b
--- /dev/null
+++ b/lua/neotest-pest/utils.lua
@@ -0,0 +1,109 @@
+local logger = require("neotest.logging")
+
+local M = {}
+local separator = "::"
+
+---Generate an id which we can use to match Treesitter queries and PHPUnit tests
+---@param position neotest.Position The position to return an ID for
+---@param namespace neotest.Position[] Any namespaces the position is within
+---@return string
+M.make_test_id = function(position)
+    -- Treesitter starts line numbers from 0 so we add 1
+    local id = position.path .. separator .. (tonumber(position.range[1]) + 1)
+
+    logger.info("Path to test file:", { position.path })
+    logger.info("Treesitter id:", { id })
+
+    return id
+end
+
+---Recursively iterate through a deeply nested table to obtain specified keys
+---@param data_table table
+---@param key string
+---@param output_table table
+---@return table
+local function iterate_key(data_table, key, output_table)
+    if type(data_table) == "table" then
+        for k, v in pairs(data_table) do
+            if key == k then
+                table.insert(output_table, v)
+            end
+            iterate_key(v, key, output_table)
+        end
+    end
+    return output_table
+end
+
+---Extract the failure messages from the tests
+---@param tests table,
+---@return boolean|table
+local function errors_or_fails(tests)
+    local errors_fails = {}
+
+    iterate_key(tests, "error", errors_fails)
+    iterate_key(tests, "failure", errors_fails)
+
+    if #errors_fails == 0 then
+        return false
+    end
+
+    return errors_fails
+end
+
+---Make the outputs for a given test
+---@param test table
+---@param output_file string
+---@return table
+local function make_outputs(test, output_file)
+    local test_attr = test["_attr"] or test[1]["_attr"]
+
+    local test_id = test_attr.file .. separator .. test_attr.line
+    logger.info("PHPUnit id:", { test_id })
+
+    local test_output = {
+        status = "passed",
+        short = string.upper(test_attr.classname) .. "\n-> " .. "PASSED" .. " - " .. test_attr.name,
+        output_file = output_file,
+    }
+
+    local test_failed = errors_or_fails(test)
+    if test_failed then
+        test_output.status = "failed"
+        test_output.short = test_failed[1]["failure"] or test_failed[1]["errors"]
+        test_output.errors = {
+            {
+                line = test_attr.line,
+            },
+        }
+    end
+
+    return test_id, test_output
+end
+
+---Iterate through test results and create a table of test IDs and outputs
+---@param tests table
+---@param output_file string
+---@param output_table table
+---@return table
+local function iterate_test_outputs(tests, output_file, output_table)
+    for i = 1, #tests, 1 do
+        if #tests[i] == 0 then
+            local test_id, test_output = make_outputs(tests[i], output_file)
+            output_table[test_id] = test_output
+        else
+            iterate_test_outputs(tests[i], output_file, output_table)
+        end
+    end
+    return output_table
+end
+
+---Get the test results from the parsed xml
+---@param parsed_xml_output table
+---@param output_file string
+---@return neotest.Result[]
+M.get_test_results = function(parsed_xml_output, output_file)
+    local tests = iterate_key(parsed_xml_output, "testcase", {})
+    return iterate_test_outputs(tests, output_file, {})
+end
+
+return M