diff --git a/src/tests/fs.rs b/src/tests/fs.rs
index 699f914..b8c5970 100644
--- a/src/tests/fs.rs
+++ b/src/tests/fs.rs
@@ -7,7 +7,7 @@ type TestResult = Result<(), fs::Error>;
 mod path_of {
     use super::*;
     #[test]
-    fn path_of_validate_fails_path_traversal() -> TestResult {
+    fn validate_fails_on_path_traversal() -> TestResult {
         let fs = fs::temp()?;
 
         let_assert!(Err(fs::Error::PathTraversal { base, path: _path }) = fs.path_of("..".into()));
@@ -20,6 +20,7 @@ mod path_of {
 mod file {
     use super::*;
     #[test]
+    /// Write to a file, read it, verify it exists, is a file and has the expected contents
     fn write_read_file_exists() -> TestResult {
         let fs = fs::temp()?;
         let pathbuf = fs.base().join("foo");
@@ -44,7 +45,7 @@ mod file {
 mod dir_create {
     use super::*;
     #[test]
-    fn dir_create_should_create_a_dir() -> TestResult {
+    fn should_create_a_dir() -> TestResult {
         let fs = fs::temp()?;
         let pathbuf = fs.base().join("subdir");
 
@@ -58,9 +59,26 @@ mod dir_create {
 
         Ok(())
     }
+    #[test]
+    fn should_fail_on_path_traversal() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("..").join("foo");
+        let_assert!(
+            Err(fs::Error::PathTraversal {
+                base: _base,
+                path: _path
+            }) = fs.dir_create(&path)
+        );
+
+        Ok(())
+    }
+}
+
+mod dir_create_all {
+    use super::*;
 
     #[test]
-    fn dir_create_all_should_create_a_dir() -> TestResult {
+    fn should_create_a_dir() -> TestResult {
         let fs = fs::temp()?;
         let pathbuf = fs.base().join("subdir").join("child");
 
@@ -72,6 +90,154 @@ mod dir_create {
         let_assert!(Ok(is_dir) = fs.path_is_dir(&pathbuf));
         assert!(is_dir, "path is a directory");
 
+        Ok(())
+    }
+    #[test]
+    fn should_fail_on_path_traversal() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("..").join("foo");
+        let_assert!(
+            Err(fs::Error::PathTraversal {
+                base: _base,
+                path: _path
+            }) = fs.dir_create_all(&path)
+        );
+
+        Ok(())
+    }
+}
+
+mod path_exists {
+    use super::*;
+    #[test]
+    fn should_be_true_when_it_exists() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        let_assert!(Ok(_) = fs.file_write(&path, "bar"));
+        let_assert!(Ok(exists) = fs.path_exists(&path));
+        assert!(exists);
+
+        Ok(())
+    }
+    #[test]
+    fn should_be_false_when_it_does_not_exist() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        let_assert!(Ok(exists) = fs.path_exists(&path));
+        assert!(!exists);
+
+        Ok(())
+    }
+    #[test]
+    fn should_fail_on_path_traversal() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("..").join("foo");
+        let_assert!(
+            Err(fs::Error::PathTraversal {
+                base: _base,
+                path: _path
+            }) = fs.path_exists(&path)
+        );
+
+        Ok(())
+    }
+}
+
+mod path_is_dir {
+    use super::*;
+    #[test]
+    fn should_be_true_when_is_a_dir() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        let_assert!(Ok(_) = fs.dir_create(&path));
+        let_assert!(Ok(is_dir) = fs.path_is_dir(&path));
+        assert!(is_dir);
+
+        Ok(())
+    }
+    #[test]
+    fn should_be_false_when_is_a_file() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        let_assert!(Ok(_) = fs.file_write(&path, "bar"));
+        let_assert!(Ok(is_dir) = fs.path_is_dir(&path));
+        assert!(!is_dir);
+
+        Ok(())
+    }
+    #[test]
+    #[ignore]
+    fn should_be_false_when_is_a_link() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        // TODO create a link
+        // let_assert!(Ok(_) = fs.file_write(&path, "bar"));
+        let_assert!(Ok(is_dir) = fs.path_is_dir(&path));
+        assert!(!is_dir);
+
+        Ok(())
+    }
+    #[test]
+    fn should_fail_on_path_traversal() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("..").join("foo");
+        let_assert!(
+            Err(fs::Error::PathTraversal {
+                base: _base,
+                path: _path
+            }) = fs.path_is_dir(&path)
+        );
+
+        Ok(())
+    }
+}
+
+mod path_is_file {
+    use super::*;
+    #[test]
+    fn should_be_true_when_is_a_file() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        let_assert!(Ok(_) = fs.file_write(&path, "bar"));
+
+        let_assert!(Ok(is_file) = fs.path_is_file(&path));
+        assert!(is_file);
+
+        Ok(())
+    }
+    #[test]
+    fn should_be_false_when_is_a_dir() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        let_assert!(Ok(_) = fs.dir_create(&path));
+        let_assert!(Ok(is_file) = fs.path_is_file(&path));
+        assert!(!is_file);
+
+        Ok(())
+    }
+    #[test]
+    #[ignore]
+    fn should_be_false_when_is_a_link() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("foo");
+        // TODO create a link
+        // let_assert!(Ok(_) = fs.file_write(&path, "bar"));
+        let_assert!(Ok(is_file) = fs.path_is_file(&path));
+        assert!(!is_file);
+
+        Ok(())
+    }
+    #[test]
+    fn should_fail_on_path_traversal() -> TestResult {
+        let fs = fs::temp()?;
+        let path = fs.base().join("..").join("foo");
+        let_assert!(
+            Err(fs::Error::PathTraversal {
+                base: _base,
+                path: _path
+            }) = fs.path_is_file(&path)
+        );
+
         Ok(())
     }
 }