Initial Dever 0.0.1

test/rust/runtime/database/postgres/registry.rs

@@ -0,0 +1,54 @@
+use crate::database::{Binding, Kind, Sql, context::initialization_order};
+
+fn binding(references: &'static [usize]) -> Binding {
+    Binding {
+        storage: crate::database::Storage::Global,
+        component: "demo",
+        database: None,
+        table: "unused",
+        schema: Sql::same(""),
+        plan: None,
+        references,
+    }
+}
+
+#[test]
+fn postgres_dependencies_precede_children_without_changing_binding_indices() {
+    let bindings = [
+        binding(&[0, 1, 2, 2]),
+        binding(&[2]),
+        binding(&[]),
+        binding(&[]),
+    ];
+    assert_eq!(
+        initialization_order(&bindings, &[true; 4]).unwrap(),
+        [2, 1, 0, 3]
+    );
+}
+
+#[test]
+fn postgres_cycles_fail_before_initialization_but_self_references_are_valid() {
+    assert_eq!(
+        initialization_order(&[binding(&[1]), binding(&[0])], &[true, true])
+            .unwrap_err()
+            .kind,
+        Kind::Migration
+    );
+    assert_eq!(
+        initialization_order(&[binding(&[0])], &[true]).unwrap(),
+        [0]
+    );
+}
+
+#[test]
+fn sqlite_keeps_source_order_and_accepts_forward_and_cyclic_references() {
+    assert_eq!(
+        initialization_order(&[binding(&[1]), binding(&[0])], &[false, false]).unwrap(),
+        [0, 1]
+    );
+    let bindings = [binding(&[2]), binding(&[3]), binding(&[]), binding(&[1])];
+    assert_eq!(
+        initialization_order(&bindings, &[true, false, true, false]).unwrap(),
+        [1, 2, 0, 3]
+    );
+}