[dice] Add integration tests for libdiced_open_dice[_nostd]

Test: atest libdiced_open_dice.integration_test \
libdiced_open_dice_nostd.integration_test
Bug: 267575445

Change-Id: Ie479bfc1f864d775632e3250aea04d93b2070942

diced/TEST_MAPPING

@@ -1,5 +1,11 @@
 {
   "presubmit": [
+    {
+      "name": "libdiced_open_dice.integration_test"
+    },
+    {
+      "name": "libdiced_open_dice_nostd.integration_test"
+    },
     {
       "name": "diced_utils_test"
     },

diced/open_dice/Android.bp

@@ -46,4 +46,25 @@ rust_library {
     ],
 }
 
-// TODO(b/267575445): Add integration tests to check the exposed API
+rust_defaults {
+    name: "libdiced_open_dice_test_defaults",
+    crate_name: "diced_open_dice_test",
+    srcs: ["tests/*.rs"],
+    test_suites: ["general-tests"],
+}
+
+rust_test {
+    name: "libdiced_open_dice.integration_test",
+    defaults: ["libdiced_open_dice_test_defaults"],
+    rustlibs: [
+        "libdiced_open_dice",
+    ],
+}
+
+rust_test {
+    name: "libdiced_open_dice_nostd.integration_test",
+    defaults: ["libdiced_open_dice_test_defaults"],
+    rustlibs: [
+        "libdiced_open_dice_nostd",
+    ],
+}

diced/open_dice/tests/api_test.rs

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use diced_open_dice::hash;
+
+#[test]
+fn hash_succeeds() {
+    assert_eq!(
+        hash(b"hello world").expect("hash failed"),
+        [
+            0x30, 0x9e, 0xcc, 0x48, 0x9c, 0x12, 0xd6, 0xeb, 0x4c, 0xc4, 0x0f, 0x50, 0xc9, 0x02,
+            0xf2, 0xb4, 0xd0, 0xed, 0x77, 0xee, 0x51, 0x1a, 0x7c, 0x7a, 0x9b, 0xcd, 0x3c, 0xa8,
+            0x6d, 0x4c, 0xd8, 0x6f, 0x98, 0x9d, 0xd3, 0x5b, 0xc5, 0xff, 0x49, 0x96, 0x70, 0xda,
+            0x34, 0x25, 0x5b, 0x45, 0xb0, 0xcf, 0xd8, 0x30, 0xe8, 0x1f, 0x60, 0x5d, 0xcf, 0x7d,
+            0xc5, 0x54, 0x2e, 0x93, 0xae, 0x9c, 0xd7, 0x6f
+        ]
+    );
+}