moved all crates into seperate folder + related path fixes

crates/test_utils/src/lib.rs

@@ -0,0 +1,56 @@
+use std::path::PathBuf;
+
+#[doc(hidden)]
+pub use pretty_assertions::assert_eq as _pretty_assert_eq;
+
+#[derive(PartialEq)]
+pub struct DebugAsDisplay<T>(pub T);
+
+impl<T: std::fmt::Display> std::fmt::Debug for DebugAsDisplay<T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+#[macro_export]
+macro_rules! assert_multiline_str_eq {
+    ($a:expr, $b:expr) => {
+        $crate::_pretty_assert_eq!($crate::DebugAsDisplay($a), $crate::DebugAsDisplay($b))
+    };
+}
+
+/**
+ * Creates a temporary empty directory that gets deleted when this goes out of scope.
+ */
+pub struct TmpDir {
+    path: std::path::PathBuf,
+}
+
+impl TmpDir {
+    pub fn new(dir: &str) -> TmpDir {
+        let path = std::path::Path::new(dir);
+        // ensure_empty_dir will fail if the dir doesn't already exist
+        std::fs::create_dir_all(path).unwrap();
+        remove_dir_all::ensure_empty_dir(&path).unwrap();
+
+        let mut pathbuf = std::path::PathBuf::new();
+        pathbuf.push(path);
+        TmpDir { path: pathbuf }
+    }
+
+    pub fn path(&self) -> &std::path::Path {
+        self.path.as_path()
+    }
+}
+
+impl Drop for TmpDir {
+    fn drop(&mut self) {
+        // we "discard" the Result because there is no problem when a dir was already removed before we call remove_dir_all
+        let _ = remove_dir_all::remove_dir_all(&self.path);
+    }
+}
+
+pub fn workspace_root() -> PathBuf {
+    let root = std::env::var("ROC_WORKSPACE_DIR").expect("Can't find the ROC_WORKSPACE_DIR variable expected to be set in .cargo/config.toml. Are you running tests outside of cargo?");
+    PathBuf::from(root)
+}