diff --git a/README.md b/README.md
index f8cc6bd..0b7c01b 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,11 @@ require("neotest").setup({
       -- Can be a function to return a dynamic value.
       -- Default: {"ExUnit.CLIFormatter"}
       extra_formatters = {"ExUnit.CLIFormatter", "ExUnitNotifier"},
+      -- Extra test block identifiers
+      -- Can be a function to return a dynamic value.
+      -- Block identifiers "test", "feature" and "property" are always supported by default.
+      -- Default: {}
+      extra_block_identifiers = {"test_with_mock"},
       -- Extra arguments to pass to mix test
       -- Can be a function that receives the position, to return a dynamic value
       -- Default: {}
@@ -48,7 +53,7 @@ require("neotest").setup({
       -- Must be a function that receives the mix command as a table, to return a dynamic value
       -- Default: function(cmd) return cmd end
       post_process_command = function(cmd)
-        return vim.tbl_flatten({"env", "FOO=bar"}, cmd})
+        return vim.tbl_flatten({{"env", "FOO=bar"}, cmd})
       end,
       -- Delays writes so that results are updated at most every given milliseconds
       -- Decreasing this number improves snappiness at the cost of performance
diff --git a/lua/neotest-elixir/init.lua b/lua/neotest-elixir/init.lua
index 1e6155d..d80b312 100644
--- a/lua/neotest-elixir/init.lua
+++ b/lua/neotest-elixir/init.lua
@@ -21,6 +21,9 @@ local function get_mix_task_args()
   return {}
 end
 
+local function get_extra_block_identifiers()
+  return {}
+end
 local function get_write_delay()
   return 1000
 end
@@ -135,6 +138,11 @@ end
 ---@async
 ---@return neotest.Tree | nil
 function ElixirNeotestAdapter.discover_positions(path)
+  local test_block_id_list = vim.tbl_flatten({ { "test", "feature", "property" }, get_extra_block_identifiers() })
+  for index, value in ipairs(test_block_id_list) do
+    test_block_id_list[index] = '"' .. value .. '"'
+  end
+  local test_block_ids = table.concat(test_block_id_list, " ")
   local query = [[
   ;; query
   ;; Describe blocks
@@ -146,7 +154,7 @@ function ElixirNeotestAdapter.discover_positions(path)
 
   ;; Test blocks (non-dynamic)
   (call
-    target: (identifier) @_target (#any-of? @_target "test" "feature" "property")
+    target: (identifier) @_target (#any-of? @_target ]] .. test_block_ids .. [[)
     (arguments . [
       (string . (quoted_content) @test.name .) ;; Simple string
       (sigil . (sigil_name) @_sigil_name . (quoted_content) @test.name .) (#any-of? @_sigil_name "s" "S") ;; Sigil ~s and ~S, no interpolations
@@ -157,7 +165,7 @@ function ElixirNeotestAdapter.discover_positions(path)
 
   ;; Test blocks (dynamic)
   (call
-    target: (identifier) @_target (#any-of? @_target "test" "feature" "property")
+    target: (identifier) @_target (#any-of? @_target ]] .. test_block_ids .. [[)
     (arguments . [
       (string (interpolation)) ;; String with interpolations
       (identifier) ;; Single variable as name
@@ -308,6 +316,11 @@ setmetatable(ElixirNeotestAdapter, {
       get_extra_formatters = extra_formatters
     end
 
+    local extra_block_identifiers = callable_opt(opts.extra_block_identifiers)
+    if extra_block_identifiers then
+      get_extra_block_identifiers = extra_block_identifiers
+    end
+
     local args = callable_opt(opts.args)
     if args then
       get_mix_task_args = args