diff --git a/.gitignore b/.gitignore
index f6af44c..351ec02 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 __pycache__
 .pytest_cache
-dist
\ No newline at end of file
+dist
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diff --git a/poetry.lock b/poetry.lock
index e9d42af..8c5b4e6 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,7 +1,212 @@
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+    {file = "coverage-7.11.3-cp314-cp314t-win32.whl", hash = "sha256:305716afb19133762e8cf62745c46c4853ad6f9eeba54a593e373289e24ea237"},
+    {file = "coverage-7.11.3-cp314-cp314t-win_amd64.whl", hash = "sha256:9245bd392572b9f799261c4c9e7216bafc9405537d0f4ce3ad93afe081a12dc9"},
+    {file = "coverage-7.11.3-cp314-cp314t-win_arm64.whl", hash = "sha256:9a1d577c20b4334e5e814c3d5fe07fa4a8c3ae42a601945e8d7940bab811d0bd"},
+    {file = "coverage-7.11.3-py3-none-any.whl", hash = "sha256:351511ae28e2509c8d8cae5311577ea7dd511ab8e746ffc8814a0896c3d33fbe"},
+    {file = "coverage-7.11.3.tar.gz", hash = "sha256:0f59387f5e6edbbffec2281affb71cdc85e0776c1745150a3ab9b6c1d016106b"},
+]
+
+[package.extras]
+toml = ["tomli"]
+
+[[package]]
+name = "iniconfig"
+version = "2.3.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.10"
+files = [
+    {file = "iniconfig-2.3.0-py3-none-any.whl", hash = "sha256:f631c04d2c48c52b84d0d0549c99ff3859c98df65b3101406327ecc7d53fbf12"},
+    {file = "iniconfig-2.3.0.tar.gz", hash = "sha256:c76315c77db068650d49c5b56314774a7804df16fee4402c1f19d6d15d8c4730"},
+]
+
+[[package]]
+name = "packaging"
+version = "25.0"
+description = "Core utilities for Python packages"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "packaging-25.0-py3-none-any.whl", hash = "sha256:29572ef2b1f17581046b3a2227d5c611fb25ec70ca1ba8554b24b0e69331a484"},
+    {file = "packaging-25.0.tar.gz", hash = "sha256:d443872c98d677bf60f6a1f2f8c1cb748e8fe762d2bf9d3148b5599295b0fc4f"},
+]
+
+[[package]]
+name = "pluggy"
+version = "1.6.0"
+description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.9"
+files = [
+    {file = "pluggy-1.6.0-py3-none-any.whl", hash = "sha256:e920276dd6813095e9377c0bc5566d94c932c33b27a3e3945d8389c374dd4746"},
+    {file = "pluggy-1.6.0.tar.gz", hash = "sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3"},
+]
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["coverage", "pytest", "pytest-benchmark"]
+
+[[package]]
+name = "pygments"
+version = "2.19.2"
+description = "Pygments is a syntax highlighting package written in Python."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pygments-2.19.2-py3-none-any.whl", hash = "sha256:86540386c03d588bb81d44bc3928634ff26449851e99741617ecb9037ee5ec0b"},
+    {file = "pygments-2.19.2.tar.gz", hash = "sha256:636cb2477cec7f8952536970bc533bc43743542f70392ae026374600add5b887"},
+]
+
+[package.extras]
+windows-terminal = ["colorama (>=0.4.6)"]
+
+[[package]]
+name = "pytest"
+version = "9.0.1"
+description = "pytest: simple powerful testing with Python"
+optional = false
+python-versions = ">=3.10"
+files = [
+    {file = "pytest-9.0.1-py3-none-any.whl", hash = "sha256:67be0030d194df2dfa7b556f2e56fb3c3315bd5c8822c6951162b92b32ce7dad"},
+    {file = "pytest-9.0.1.tar.gz", hash = "sha256:3e9c069ea73583e255c3b21cf46b8d3c56f6e3a1a8f6da94ccb0fcf57b9d73c8"},
+]
+
+[package.dependencies]
+colorama = {version = ">=0.4", markers = "sys_platform == \"win32\""}
+iniconfig = ">=1.0.1"
+packaging = ">=22"
+pluggy = ">=1.5,<2"
+pygments = ">=2.7.2"
+
+[package.extras]
+dev = ["argcomplete", "attrs (>=19.2)", "hypothesis (>=3.56)", "mock", "requests", "setuptools", "xmlschema"]
+
+[[package]]
+name = "pytest-cov"
+version = "7.0.0"
+description = "Pytest plugin for measuring coverage."
+optional = false
+python-versions = ">=3.9"
+files = [
+    {file = "pytest_cov-7.0.0-py3-none-any.whl", hash = "sha256:3b8e9558b16cc1479da72058bdecf8073661c7f57f7d3c5f22a1c23507f2d861"},
+    {file = "pytest_cov-7.0.0.tar.gz", hash = "sha256:33c97eda2e049a0c5298e91f519302a1334c26ac65c1a483d6206fd458361af1"},
+]
+
+[package.dependencies]
+coverage = {version = ">=7.10.6", extras = ["toml"]}
+pluggy = ">=1.2"
+pytest = ">=7"
+
+[package.extras]
+testing = ["process-tests", "pytest-xdist", "virtualenv"]
 
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.13"
-content-hash = "f01b553f3895e558c34b4f10542e05acdef39bf0527c8090bd136d914dc73f94"
+content-hash = "5185a260c03fe751a05b67cccbcd3f9f9eb7774f75340f54ed69166e6f00a539"
diff --git a/pyproject.toml b/pyproject.toml
index 61f5d42..9759885 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "mirro"
-version = "0.1.0"
+version = "0.2.0"
 description = "A safe editing wrapper: edits a temp copy, compares, and saves original backup if changed."
 authors = ["Marco D'Aleo <marco@marcodaleo.com>"]
 license = "GPL-3.0-or-later"
@@ -15,6 +15,10 @@ python = "^3.13"
 [tool.poetry.scripts]
 mirro = "mirro.main:main"
 
+[tool.poetry.group.dev.dependencies]
+pytest = "^9.0.1"
+pytest-cov = "^7.0.0"
+
 [build-system]
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
diff --git a/src/mirro/main.py b/src/mirro/main.py
index 1057f26..5ca7fce 100644
--- a/src/mirro/main.py
+++ b/src/mirro/main.py
@@ -1,3 +1,4 @@
+import importlib.metadata
 import argparse
 import tempfile
 import subprocess
@@ -6,6 +7,13 @@ from pathlib import Path
 import time
 
 
+def get_version():
+    try:
+        return importlib.metadata.version("mirro")
+    except importlib.metadata.PackageNotFoundError:
+        return "unknown"
+
+
 def read_file(path: Path) -> str:
     if not path.exists():
         return ""
@@ -42,7 +50,7 @@ def main():
     parser = argparse.ArgumentParser(
         description="Safely edit a file with automatic original backup if changed."
     )
-    parser.add_argument("file", type=str, help="Path to file to edit")
+
     parser.add_argument(
         "--backup-dir",
         type=str,
@@ -50,13 +58,37 @@ def main():
         help="Backup directory",
     )
 
-    args = parser.parse_args()
+    parser.add_argument(
+        "--version",
+        action="version",
+        version=f"mirro {get_version()}",
+    )
 
-    editor = os.environ.get("EDITOR","nano")
-    target = Path(args.file).expanduser().resolve()
-    backup_dir = Path(args.backup_dir).expanduser().resolve()
+    # Parse only options. Leave everything else untouched.
+    args, positional = parser.parse_known_args()
+
+    # Flexible positional parsing
+    if not positional:
+        parser.error("the following arguments are required: file")
+
+    file_arg = None
+    editor_extra = []
+
+    for p in positional:
+        if file_arg is None and not p.startswith("+") and not p.startswith("-"):
+            file_arg = p
+        else:
+            editor_extra.append(p)
+
+    if file_arg is None:
+        parser.error("the following arguments are required: file")
+
+    editor = os.environ.get("EDITOR", "nano")
     editor_cmd = editor.split()
 
+    target = Path(file_arg).expanduser().resolve()
+    backup_dir = Path(args.backup_dir).expanduser().resolve()
+
     # Permission checks
     parent = target.parent
     if target.exists() and not os.access(target, os.W_OK):
@@ -77,11 +109,13 @@ def main():
         delete=False, prefix="mirro-", suffix=target.suffix
     ) as tf:
         temp_path = Path(tf.name)
-    # Write prepopulated or original content to temp file
+
     write_file(temp_path, original_content)
 
-    # Launch editor
-    subprocess.call(editor_cmd + [str(temp_path)])
+    if "nano" in editor_cmd[0]:
+        subprocess.call(editor_cmd + editor_extra + [str(temp_path)])
+    else:
+        subprocess.call(editor_cmd + [str(temp_path)] + editor_extra)
 
     # Read edited
     edited_content = read_file(temp_path)
diff --git a/tests/test_mirro.py b/tests/test_mirro.py
new file mode 100644
index 0000000..b4aeb37
--- /dev/null
+++ b/tests/test_mirro.py
@@ -0,0 +1,287 @@
+import os
+import time
+import subprocess
+from pathlib import Path
+from unittest.mock import patch
+
+import pytest
+
+import mirro.main as mirro
+
+
+# ============================================================
+# get_version
+# ============================================================
+
+def test_get_version_found(monkeypatch):
+    monkeypatch.setattr(
+        mirro.importlib.metadata, "version", lambda _: "1.2.3"
+    )
+    assert mirro.get_version() == "1.2.3"
+
+
+def test_get_version_not_found(monkeypatch):
+    def raiser(_):
+        raise mirro.importlib.metadata.PackageNotFoundError
+    monkeypatch.setattr(mirro.importlib.metadata, "version", raiser)
+    assert mirro.get_version() == "unknown"
+
+
+# ============================================================
+# read_file / write_file
+# ============================================================
+
+def test_read_file_exists(tmp_path):
+    p = tmp_path / "x.txt"
+    p.write_text("hello\n", encoding="utf-8")
+    assert mirro.read_file(p) == "hello\n"
+
+
+def test_read_file_missing(tmp_path):
+    assert mirro.read_file(tmp_path / "nope.txt") == ""
+
+
+def test_write_file(tmp_path):
+    p = tmp_path / "y.txt"
+    mirro.write_file(p, "data")
+    assert p.read_text(encoding="utf-8") == "data"
+
+
+# ============================================================
+# backup_original
+# ============================================================
+
+def test_backup_original(tmp_path, monkeypatch):
+    original_path = tmp_path / "test.txt"
+    original_content = "ABC"
+    backup_dir = tmp_path / "backups"
+
+    # Freeze timestamps
+    monkeypatch.setattr(time, "gmtime", lambda: time.struct_time((2023,1,2,3,4,5,0,0,0)))
+    monkeypatch.setattr(
+        time,
+        "strftime",
+        lambda fmt, _: {
+            "%Y-%m-%d %H:%M:%S UTC": "2023-01-02 03:04:05 UTC",
+            "%Y%m%dT%H%M%S": "20230102T030405",
+        }[fmt]
+    )
+
+    backup_path = mirro.backup_original(original_path, original_content, backup_dir)
+
+    assert backup_path.exists()
+    text = backup_path.read_text(encoding="utf-8")
+    assert "mirro backup" in text
+    assert "Original file:" in text
+    assert original_content in text
+
+
+# ============================================================
+# Helper to run main()
+# ============================================================
+
+def simulate_main(
+    monkeypatch,
+    capsys,
+    args,
+    *,
+    editor="nano",
+    start_content=None,
+    edited_content=None,
+    file_exists=True,
+    override_access=None,
+):
+    """Utility to simulate mirro.main()"""
+
+    monkeypatch.setenv("EDITOR", editor)
+
+    # Fake editor
+    def fake_call(cmd):
+        temp = Path(cmd[-1])
+        if edited_content is None:
+            temp.write_text(start_content or "", encoding="utf-8")
+        else:
+            temp.write_text(edited_content, encoding="utf-8")
+        return 0
+
+    monkeypatch.setattr(subprocess, "call", fake_call)
+
+    # Access override if provided
+    if override_access:
+        monkeypatch.setattr(os, "access", override_access)
+    else:
+        monkeypatch.setattr(os, "access", lambda p, m: True)
+
+    # Set up file as needed
+    target = Path(args[-1]).expanduser().resolve()
+    if file_exists:
+        target.parent.mkdir(parents=True, exist_ok=True)
+        target.write_text(start_content or "", encoding="utf-8")
+
+    with patch("sys.argv", ["mirro"] + args):
+        result = mirro.main()
+
+    out = capsys.readouterr().out
+    return result, out
+
+
+# ============================================================
+# main: missing file argument
+# ============================================================
+
+def test_main_missing_argument(capsys):
+    with patch("sys.argv", ["mirro"]):
+        with pytest.raises(SystemExit):
+            mirro.main()
+
+    assert "the following arguments are required: file" in capsys.readouterr().err
+
+
+# ============================================================
+# main: unchanged file (line 137)
+# ============================================================
+
+def test_main_existing_unchanged(tmp_path, monkeypatch, capsys):
+    target = tmp_path / "file.txt"
+    target.write_text("hello\n", encoding="utf-8")
+
+    def fake_call(cmd):
+        temp = Path(cmd[-1])
+        temp.write_text("hello\n", encoding="utf-8")
+
+    monkeypatch.setenv("EDITOR", "nano")
+    monkeypatch.setattr(subprocess, "call", fake_call)
+    monkeypatch.setattr(os, "access", lambda p, m: True)
+
+    with patch("sys.argv", ["mirro", str(target)]):
+        mirro.main()
+
+    out = capsys.readouterr().out
+    assert "file hasn't changed" in out
+
+
+# ============================================================
+# main: changed file
+# ============================================================
+
+def test_main_existing_changed(tmp_path, monkeypatch, capsys):
+    target = tmp_path / "file2.txt"
+
+    result, out = simulate_main(
+        monkeypatch,
+        capsys,
+        args=[str(target)],
+        start_content="old\n",
+        edited_content="new\n",
+        file_exists=True,
+    )
+
+    assert "file changed; original backed up at" in out
+    assert target.read_text(encoding="utf-8") == "new\n"
+
+
+# ============================================================
+# main: new file unchanged
+# ============================================================
+
+def test_main_new_file_unchanged(tmp_path, monkeypatch, capsys):
+    new = tmp_path / "new.txt"
+
+    result, out = simulate_main(
+        monkeypatch,
+        capsys,
+        args=[str(new)],
+        start_content=None,
+        edited_content="This is a new file created with 'mirro'!\n",
+        file_exists=False,
+    )
+
+    assert "file hasn't changed" in out
+    assert not new.exists()
+
+
+# ============================================================
+# main: new file changed
+# ============================================================
+
+def test_main_new_file_changed(tmp_path, monkeypatch, capsys):
+    new = tmp_path / "new2.txt"
+
+    result, out = simulate_main(
+        monkeypatch,
+        capsys,
+        args=[str(new)],
+        start_content=None,
+        edited_content="XYZ\n",
+        file_exists=False,
+    )
+
+    assert "file changed; original backed up at" in out
+    assert new.read_text(encoding="utf-8") == "XYZ\n"
+
+
+# ============================================================
+# main: permission denied for existing file (line 78)
+# ============================================================
+
+def test_main_permission_denied_existing(tmp_path, monkeypatch, capsys):
+    target = tmp_path / "blocked.txt"
+    target.write_text("hello", encoding="utf-8")
+
+    monkeypatch.setenv("EDITOR", "nano")
+    monkeypatch.setattr(os, "access", lambda p, m: False)
+
+    with patch("sys.argv", ["mirro", str(target)]):
+        result = mirro.main()
+
+    out = capsys.readouterr().out
+    assert "Need elevated privileges to open" in out
+    assert result == 1
+
+
+# ============================================================
+# main: permission denied creating file (line 84)
+# ============================================================
+
+def test_main_permission_denied_create(tmp_path, monkeypatch, capsys):
+    newfile = tmp_path / "subdir" / "nofile.txt"
+    parent = newfile.parent
+    parent.mkdir(parents=True, exist_ok=True)
+
+    # Directory is not writable
+    def fake_access(path, mode):
+        if path == parent:
+            return False
+        return True
+
+    monkeypatch.setattr(os, "access", fake_access)
+    monkeypatch.setenv("EDITOR", "nano")
+
+    with patch("sys.argv", ["mirro", str(newfile)]):
+        result = mirro.main()
+
+    out = capsys.readouterr().out
+    assert "Need elevated privileges to create" in out
+    assert result == 1
+
+
+# ============================================================
+# main: non-nano editor (ordering branch)
+# ============================================================
+
+def test_main_editor_non_nano(tmp_path, monkeypatch, capsys):
+    target = tmp_path / "vim.txt"
+    target.write_text("old\n", encoding="utf-8")
+
+    def fake_call(cmd):
+        temp = Path(cmd[1])  # in non-nano mode
+        temp.write_text("edited\n", encoding="utf-8")
+
+    monkeypatch.setenv("EDITOR", "vim")
+    monkeypatch.setattr(subprocess, "call", fake_call)
+    monkeypatch.setattr(os, "access", lambda p, m: True)
+
+    with patch("sys.argv", ["mirro", str(target)]):
+        mirro.main()
+
+    assert target.read_text(encoding="utf-8") == "edited\n"