feat(fixture): Support creating dirs

Fixes #36

Author: epage

src/fixture.rs

@@ -96,6 +96,32 @@ impl ChildPath {
     }
 }
 
+/// Create empty directories at [`ChildPath`].
+///
+/// [`ChildPath`]: struct.ChildPath.html
+pub trait PathCreateDir {
+    /// Create an empty file at [`ChildPath`].
+    ///
+    /// # Examples
+    ///
+    /// ```rust
+    /// use assert_fs::prelude::*;
+    ///
+    /// let temp = assert_fs::TempDir::new().unwrap();
+    /// temp.child("subdir").create_dir_all().unwrap();
+    /// temp.close().unwrap();
+    /// ```
+    ///
+    /// [`ChildPath`]: struct.ChildPath.html
+    fn create_dir_all(&self) -> io::Result<()>;
+}
+
+impl PathCreateDir for ChildPath {
+    fn create_dir_all(&self) -> io::Result<()> {
+        create_dir_all(self.path())
+    }
+}
+
 /// Create empty files at [`ChildPath`].
 ///
 /// [`ChildPath`]: struct.ChildPath.html
@@ -222,6 +248,11 @@ impl PathCopy for ChildPath {
     }
 }
 
+fn create_dir_all(path: &path::Path) -> io::Result<()> {
+    fs::create_dir_all(path)?;
+    Ok(())
+}
+
 fn touch(path: &path::Path) -> io::Result<()> {
     fs::File::create(path)?;
     Ok(())

src/lib.rs

@@ -78,6 +78,7 @@ pub use fixture::TempDir;
 /// Extension traits that are useful to have available.
 pub mod prelude {
     pub use assert::PathAssert;
+    pub use fixture::PathCreateDir;
     pub use fixture::FileTouch;
     pub use fixture::FileWriteBin;
     pub use fixture::FileWriteStr;