Move all crates to a top-level crates folder

Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/util/src/test.rs

@@ -0,0 +1,37 @@
+use std::path::{Path, PathBuf};
+use tempdir::TempDir;
+
+pub fn temp_tree(tree: serde_json::Value) -> TempDir {
+    let dir = TempDir::new("").unwrap();
+    write_tree(dir.path(), tree);
+    dir
+}
+
+fn write_tree(path: &Path, tree: serde_json::Value) {
+    use serde_json::Value;
+    use std::fs;
+
+    if let Value::Object(map) = tree {
+        for (name, contents) in map {
+            let mut path = PathBuf::from(path);
+            path.push(name);
+            match contents {
+                Value::Object(_) => {
+                    fs::create_dir(&path).unwrap();
+                    write_tree(&path, contents);
+                }
+                Value::Null => {
+                    fs::create_dir(&path).unwrap();
+                }
+                Value::String(contents) => {
+                    fs::write(&path, contents).unwrap();
+                }
+                _ => {
+                    panic!("JSON object must contain only objects, strings, or null");
+                }
+            }
+        }
+    } else {
+        panic!("You must pass a JSON object to this helper")
+    }
+}