Add tests for references

tests/references.js

@@ -0,0 +1,48 @@
+type Type = {
+    a: A,
+    b: B[],
+    c: C<number>,
+};
+
+interface Interface {
+    a: A;
+    b: B[];
+    c: C<number>;
+}
+
+class Class {
+    a: A;
+    b: B[];
+    c: C<number>;
+}
+
+// ###
+({
+    Type: {
+        type: 'record',
+        name: 'Type',
+        fields: [
+            {name: 'a', type: 'A'},
+            {name: 'b', type: {type: 'array', items: 'B'}},
+            {name: 'c', type: 'C'},
+        ],
+    },
+    Interface: {
+        type: 'record',
+        name: 'Interface',
+        fields: [
+            {name: 'a', type: 'A'},
+            {name: 'b', type: {type: 'array', items: 'B'}},
+            {name: 'c', type: 'C'},
+        ],
+    },
+    Class: {
+        type: 'record',
+        name: 'Class',
+        fields: [
+            {name: 'a', type: 'A'},
+            {name: 'b', type: {type: 'array', items: 'B'}},
+            {name: 'c', type: 'C'},
+        ],
+    },
+});