Enable the python module for tox files (#369)

Enable the python module if the current directory contains a `tox.ini`
file.

docs/config/README.md

@@ -568,6 +568,7 @@ The module will be shown if any of the following conditions are met:
 - The current directory contains a `pyproject.toml` file
 - The current directory contains a file with the `.py` extension
 - The current directory contains a `Pipfile` file
+- The current directory contains a `tox.ini` file
 
 ### Options
 

src/modules/python.rs

@@ -14,6 +14,7 @@ use super::{Context, Module};
 ///     - Current directory contains a `pyproject.toml` file
 ///     - Current directory contains a file with the `.py` extension
 ///     - Current directory contains a `Pipfile` file
+///     - Current directory contains a `tox.ini` file
 pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let is_py_project = context
         .try_begin_scan()?
@@ -22,6 +23,7 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
             ".python-version",
             "pyproject.toml",
             "Pipfile",
+            "tox.ini",
         ])
         .set_extensions(&["py"])
         .is_match();

tests/testsuite/python.rs

@@ -73,6 +73,23 @@ fn folder_with_pipfile() -> io::Result<()> {
     Ok(())
 }
 
+#[test]
+#[ignore]
+fn folder_with_tox() -> io::Result<()> {
+    let dir = common::new_tempdir()?;
+    File::create(dir.path().join("tox.ini"))?;
+
+    let output = common::render_module("python")
+        .arg("--path")
+        .arg(dir.path())
+        .output()?;
+    let actual = String::from_utf8(output.stdout).unwrap();
+
+    let expected = format!("via {} ", Color::Yellow.bold().paint("🐍 v3.6.9"));
+    assert_eq!(expected, actual);
+    Ok(())
+}
+
 #[test]
 #[ignore]
 fn folder_with_py_file() -> io::Result<()> {