fix: add better testing

Author: karatakis

src/core/config/config.rs

@@ -566,7 +566,7 @@ impl Config {
             interfaces_types_map.insert(interface_name.clone(), types_set);
         }
 
-        interfaces_types
+        interfaces_types_map
     }
 
     /// Returns a list of all the arguments in the configuration
@@ -821,4 +821,54 @@ mod tests {
             .collect();
         assert_eq!(union_types, expected_union_types);
     }
+
+    #[test]
+    fn test_interfaces_types_map() {
+        let sdl = std::fs::read_to_string(tailcall_fixtures::configs::INTERFACE_CONFIG).unwrap();
+        let config = Config::from_sdl(&sdl).to_result().unwrap();
+        let interfaces_types_map = config.interfaces_types_map();
+
+        let mut expected_union_types = BTreeMap::new();
+
+        {
+            let mut set = BTreeSet::new();
+            set.insert("E".to_string());
+            set.insert("F".to_string());
+            expected_union_types.insert("T0".to_string(), set);
+        }
+
+        {
+            let mut set = BTreeSet::new();
+            set.insert("A".to_string());
+            set.insert("E".to_string());
+            set.insert("B".to_string());
+            set.insert("C".to_string());
+            set.insert("D".to_string());
+            expected_union_types.insert("T1".to_string(), set);
+        }
+
+        {
+            let mut set = BTreeSet::new();
+            set.insert("B".to_string());
+            set.insert("E".to_string());
+            set.insert("D".to_string());
+            expected_union_types.insert("T2".to_string(), set);
+        }
+
+        {
+            let mut set = BTreeSet::new();
+            set.insert("C".to_string());
+            set.insert("E".to_string());
+            set.insert("D".to_string());
+            expected_union_types.insert("T3".to_string(), set);
+        }
+
+        {
+            let mut set = BTreeSet::new();
+            set.insert("D".to_string());
+            expected_union_types.insert("T4".to_string(), set);
+        }
+
+        assert_eq!(interfaces_types_map, expected_union_types);
+    }
 }

tailcall-fixtures/fixtures/configs/interface-config.graphql

@@ -0,0 +1,53 @@
+schema @server {
+  query: Query
+}
+
+interface T0 {
+    id: Int!
+}
+
+interface T1 {
+    id: Int!
+}
+
+interface T2 implements T1 {
+    id: Int!
+}
+
+interface T3 implements T1 {
+    id: Int!
+}
+
+interface T4 implements T2 & T3 & T1 {
+    id: Int!
+}
+
+
+
+type A implements T1 {
+    id: Int!
+}
+type B implements T2 {
+    id: Int!
+}
+type C implements T3 {
+    id: Int!
+}
+type D implements T4 {
+    id: Int!
+}
+type E implements T1 & T2 & T3 & T0 {
+    id: Int!
+}
+type F implements T0 {
+    id: Int!
+}
+
+type Query {
+    a: A @expr(body: "A")
+    b: B @expr(body: "B")
+    c: C @expr(body: "C")
+    d: D @expr(body: "D")
+    e: E @expr(body: "E")
+    f: F @expr(body: "F")
+}