fix

Author: andreaTP

core/src/main/java/com/styra/opa/wasm/OpaPolicy.java

@@ -93,6 +93,11 @@ public OpaPolicy data(JsonNode data) {
     }
 
     public OpaPolicy input(String input) {
+        if (this.dataAddr == -1) {
+            // to keep the ordering: data - input - evaluate
+            data("");
+        }
+
         var inputLen = input.getBytes().length;
         var delta = this.dataHeapPtr + inputLen - (wasm.memory().pages() * Memory.PAGE_SIZE);
         if (delta > 0) {

core/src/test/java/com/styra/opa/wasm/OpaTest.java

@@ -98,7 +98,6 @@ public void highLevelAPI() throws Exception {
     @Test
     public void issue69() throws Exception {
         var policy = OpaPolicy.builder().withPolicy(issue69WasmFile).build();
-        policy.data("");
 
         policy.input("{\"method\":\"GET\"}");
         Assertions.assertTrue(Utils.getResult(policy.evaluate()).asBoolean());