diff --git a/CHANGELOG.md b/CHANGELOG.md
index 897b446..592ff30 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Release 1.6
 
+- Added [run-test.sh](run-tests.sh) script that runs all checks on code
 - Added support for Python 3.12 and 3.13 by upgrading Pylint and disabling/fixing Pylint errors
 - Corrected and improved language consistency in [readme](README.md) and `CHANGELOG.md`
 
diff --git a/DEVELOPER.md b/DEVELOPER.md
index d3ca0c1..81ce442 100644
--- a/DEVELOPER.md
+++ b/DEVELOPER.md
@@ -4,7 +4,7 @@
 For every release, the following process is used.
 
 ### Before Release
-1. From the project directory, run `./run-tests.sh` to insure unit tests pass (on python 2 and 3),
+1. From the project directory, run [./run-tests.sh](run-tests.sh) to insure unit tests pass (on python 2 and 3),
 and that pylint succeeds
 2. Push commit which is the candidate release to Github master
 3. Wait for tests to pass on [TravisCI](https://travis-ci.org/EntilZha/PyFunctional)
diff --git a/functional/pipeline.py b/functional/pipeline.py
index 805577a..d923994 100644
--- a/functional/pipeline.py
+++ b/functional/pipeline.py
@@ -39,7 +39,8 @@
     from collections.abc import Iterable
 
     # pylint: disable=deprecated-class
-    from typing import Callable, Any, Iterator, NoReturn, Hashable
+    from typing import Callable, Any, NoReturn
+    from collections.abc import Iterator, Hashable
     from _typeshed import SupportsRichComparison
     from _typeshed import SupportsRichComparisonT
     from typing_extensions import TypeGuard
diff --git a/functional/streams.py b/functional/streams.py
index 1f8a605..86d769c 100644
--- a/functional/streams.py
+++ b/functional/streams.py
@@ -6,8 +6,8 @@
 import builtins
 
 from itertools import chain
-from typing import Any, Iterable, Iterator, SupportsIndex
-from typing import TypeVar, overload
+from typing import Any, SupportsIndex, TypeVar, overload
+from collections.abc import Iterable, Iterator
 import typing
 
 from functional.execution import ExecutionEngine, ParallelExecutionEngine
diff --git a/pyproject.toml b/pyproject.toml
index 6747909..d79f56f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,14 +37,12 @@ pandas = { version = ">=1.0.3", optional = true }
 [tool.poetry.extras]
 all = ["pandas"]
 
-[tool.poetry.dev-dependencies]
+[tool.poetry.group.dev.dependencies]
 black = "^23.1"
 pytest = "^7.3.1"
 pylint = "^3.3.3"
 pytest-cov = "^4.0.0"
 coverage = "^7.2.5"
-
-[tool.poetry.group.dev.dependencies]
 mypy = "^1.1.1"
 types-tabulate = "^0.9.0.3"
 pandas-stubs = "^2.0.3.230814"
diff --git a/run-tests.sh b/run-tests.sh
new file mode 100755
index 0000000..2d709b0
--- /dev/null
+++ b/run-tests.sh
@@ -0,0 +1,112 @@
+
+# campare_versions(v1, v2)
+# Compares two 3-part sematic versions, returning -1 if v1 is less than v2, 1 if v1 is greater than v2 or 0 if v1 and v2 are equal.
+compare_versions() {
+  local v1=(${1//./ })
+  local v2=(${2//./ })
+
+  for i in {0..2}; do
+    if [[ ${v1[i]} -lt ${v2[i]} ]]; then
+      # Version $1 is less than $2
+      echo -1
+      return
+    elif [[ ${v1[i]} -gt ${v2[i]} ]]; then
+      # Version $1 is greater than $2"
+      echo 1
+      return
+    fi
+  done
+  # "Version $1 is equal to $2"
+  echo 0
+}
+
+# get_version_in_pipx(package_name)
+# Gets the standard semantic version of a package installed in Pipx if installed.
+get_version_in_pipx() {
+  local package_name=$1
+  local version
+  version=$(pipx list | grep -oP "$package_name"\\s+\\K\[0-9\]+\.\[0-9\]+\.\[0-9\]+)
+  echo "$version"
+}
+
+# capitalise(word)
+# Capitalizes a word.
+capitalize() {
+  local word=$1
+  echo "$(tr '[:lower:]' '[:upper:]' <<< "${word:0:1}")${word:1}"
+}
+
+# print_version(name, version, capitalize, width)
+# Prints the version of the software with option to capitalize name and change left-aligned padding.
+print_version() {
+  local name=$1
+  local version=$2
+  local capitalize=${3:-true}
+  local width=${4:-19}
+  name=$([[ $capitalize == 'true' ]] && capitalize "$name" || echo "$name")
+  printf "%-${width}s %s\n" "$name version:" "$version"
+}
+
+# install_package(package_name)
+# Installs specified package with Pipx or displays the its version if it's already installed.
+install_package() {
+  local package_name=$1
+  local capitalize=${2:-true}
+
+  local version
+  version=$(get_version_in_pipx "$package_name")
+  if [[ -n $version ]]; then
+    print_version "$package_name" "$version" "$capitalize"
+  else
+    pipx install "$package_name"
+    pipx ensurepath
+  fi
+}
+
+main() {
+  local python_version
+  python_version=$(python --version | awk '{print $2}')
+  print_version "Python" "$python_version"
+
+  local pipx_version
+  pipx_version=$(pipx --version)
+  if [[ -z "$pipx_version" ]]; then
+    echo "Please install Pipx before running this script."
+    exit 1
+  else
+    print_version "Pipx" "$pipx_version"
+  fi
+
+  install_package "poetry"
+
+  install_package "pre-commit" false
+
+  echo
+
+  if ! poetry install; then
+    poetry lock
+    poetry install
+  fi
+
+  echo
+
+  poetry run pylint functional
+
+  echo
+
+  poetry run ruff check functional
+
+  echo
+
+  poetry run black --diff --color --check functional
+
+  echo
+
+  poetry run mypy functional
+
+  echo
+
+  poetry run pytest
+}
+
+main "$@"
\ No newline at end of file