diff --git a/README.md b/README.md
index ba874e3..1b9f296 100644
--- a/README.md
+++ b/README.md
@@ -62,3 +62,4 @@ Use the standard `test-samurai.nvim` commands (e.g. `TSamNearest`, `TSamFile`, `
 - The reporter lives at `reporter/test_samurai_jest_reporter.js` and is loaded via `--reporters`.
 - Test names are reported as `Describe/It` for grouping in the listing.
 - Stdout capture uses `reporter/test_samurai_jest_stdout.js` via `--setupFilesAfterEnv` and tags output as `TSAMURAI_STDOUT`.
+- If present, `jest.setup.js` or `jest.setup.ts` from the project root or `test/.bin` is appended via `--setupFilesAfterEnv`.
diff --git a/lua/test-samurai-jest-runner/init.lua b/lua/test-samurai-jest-runner/init.lua
index 78a750f..1af6e2e 100644
--- a/lua/test-samurai-jest-runner/init.lua
+++ b/lua/test-samurai-jest-runner/init.lua
@@ -351,8 +351,26 @@ local function setup_path()
   return vim.fs.normalize(dir .. "/../../reporter/test_samurai_jest_stdout.js")
 end
 
-local function base_cmd()
-  return {
+local function find_jest_setup(cwd)
+  if not cwd or cwd == "" then
+    return nil
+  end
+  local candidates = {
+    cwd .. "/jest.setup.js",
+    cwd .. "/jest.setup.ts",
+    cwd .. "/test/.bin/jest.setup.js",
+    cwd .. "/test/.bin/jest.setup.ts",
+  }
+  for _, candidate in ipairs(candidates) do
+    if vim.fn.filereadable(candidate) == 1 then
+      return candidate
+    end
+  end
+  return nil
+end
+
+local function base_cmd(cwd)
+  local cmd = {
     "npx",
     "jest",
     "--testLocationInResults",
@@ -361,6 +379,12 @@ local function base_cmd()
     "--setupFilesAfterEnv",
     setup_path(),
   }
+  local project_setup = find_jest_setup(cwd)
+  if project_setup then
+    table.insert(cmd, "--setupFilesAfterEnv")
+    table.insert(cmd, project_setup)
+  end
+  return cmd
 end
 
 local function parse_result_line(line)
@@ -502,15 +526,15 @@ end
 function runner.build_command(spec)
   local file = spec.file
   if not file or file == "" then
-    return { cmd = base_cmd(), cwd = spec.cwd }
+    return { cmd = base_cmd(spec.cwd), cwd = spec.cwd }
   end
   if spec.kind == "file" then
-    local cmd = base_cmd()
+    local cmd = base_cmd(spec.cwd)
     table.insert(cmd, "--runTestsByPath")
     table.insert(cmd, file)
     return { cmd = cmd, cwd = spec.cwd }
   end
-  local cmd = base_cmd()
+  local cmd = base_cmd(spec.cwd)
   table.insert(cmd, "--runTestsByPath")
   table.insert(cmd, file)
   local ok, pattern = pcall(function()
@@ -546,7 +570,7 @@ function runner.build_file_command(bufnr)
     "jest.config.mjs",
     "jest.config.json",
   })
-  local cmd = base_cmd()
+  local cmd = base_cmd(cwd)
   table.insert(cmd, "--runTestsByPath")
   table.insert(cmd, path)
   return { cmd = cmd, cwd = cwd }
@@ -562,7 +586,7 @@ function runner.build_all_command(bufnr)
     "jest.config.mjs",
     "jest.config.json",
   })
-  local cmd = base_cmd()
+  local cmd = base_cmd(cwd)
   return { cmd = cmd, cwd = cwd }
 end
 
@@ -571,7 +595,8 @@ function runner.build_failed_command(last_command, failures, _scope_kind)
     if last_command and last_command.cmd then
       return { cmd = last_command.cmd, cwd = last_command.cwd }
     end
-    return { cmd = base_cmd() }
+    local cwd = vim.loop.cwd()
+    return { cmd = base_cmd(cwd), cwd = cwd }
   end
 
   local pattern_parts = {}
@@ -595,7 +620,7 @@ function runner.build_failed_command(last_command, failures, _scope_kind)
     end
   end
   if #cmd == 0 then
-    cmd = base_cmd()
+    cmd = base_cmd(last_command and last_command.cwd or vim.loop.cwd())
   end
   table.insert(cmd, "--testNamePattern")
   table.insert(cmd, pattern)
diff --git a/tests/test_jest_runner_spec.lua b/tests/test_jest_runner_spec.lua
index 83a8088..96ce33b 100644
--- a/tests/test_jest_runner_spec.lua
+++ b/tests/test_jest_runner_spec.lua
@@ -279,6 +279,62 @@ describe("test-samurai-jest-runner", function()
     end)
   end)
 
+  it("adds jest.setup.js from project root to setupFilesAfterEnv", function()
+    with_project(JEST_PACKAGE, function(root)
+      write_file(root .. "/jest.setup.js", "console.log('setup')")
+      local bufnr = vim.api.nvim_create_buf(false, true)
+      vim.api.nvim_buf_set_name(bufnr, root .. "/foo.test.ts")
+
+      local cmd_spec = runner.build_file_command(bufnr)
+
+      assert.are.same(
+        {
+          "npx",
+          "jest",
+          "--testLocationInResults",
+          "--reporters",
+          get_reporter_path(),
+          "--setupFilesAfterEnv",
+          get_setup_path(),
+          "--setupFilesAfterEnv",
+          root .. "/jest.setup.js",
+          "--runTestsByPath",
+          root .. "/foo.test.ts",
+        },
+        cmd_spec.cmd
+      )
+      assert.equals(root, cmd_spec.cwd)
+    end)
+  end)
+
+  it("adds jest.setup.ts from test/.bin when root setup is missing", function()
+    with_project(JEST_PACKAGE, function(root)
+      write_file(root .. "/test/.bin/jest.setup.ts", "console.log('setup')")
+      local bufnr = vim.api.nvim_create_buf(false, true)
+      vim.api.nvim_buf_set_name(bufnr, root .. "/bar.test.ts")
+
+      local cmd_spec = runner.build_file_command(bufnr)
+
+      assert.are.same(
+        {
+          "npx",
+          "jest",
+          "--testLocationInResults",
+          "--reporters",
+          get_reporter_path(),
+          "--setupFilesAfterEnv",
+          get_setup_path(),
+          "--setupFilesAfterEnv",
+          root .. "/test/.bin/jest.setup.ts",
+          "--runTestsByPath",
+          root .. "/bar.test.ts",
+        },
+        cmd_spec.cmd
+      )
+      assert.equals(root, cmd_spec.cwd)
+    end)
+  end)
+
   it("build_all_command runs project tests", function()
     with_project(JEST_PACKAGE, function(root)
       local bufnr = vim.api.nvim_create_buf(false, true)