Add no_std tests

Author: jrobsonchase

tests/RustTest.sh

@@ -41,3 +41,9 @@ else
 fi
 
 cargo bench $TARGET_FLAG
+
+# make sure that the no_std variant builds
+rustup install nightly
+
+cd ../../rust/flatbuffers
+cargo +nightly build --no-default-features

tests/rust_usage_test/tests/no_std_test.rs

@@ -0,0 +1,60 @@
+#![no_std]
+
+extern crate flatbuffers;
+
+#[allow(dead_code, unused_imports)]
+#[path = "../../monster_test_generated.rs"]
+mod monster_test_generated;
+pub use monster_test_generated::my_game;
+
+static MONSTER_DATA: &[u8] = include_bytes!("../../monsterdata_test.mon");
+
+// Note: Copied from `bin/monster_example.rs`
+#[test]
+fn no_std_example_data() {
+    let monster = my_game::example::get_root_as_monster(MONSTER_DATA);
+
+    assert_eq!(monster.hp(), 80);
+    assert_eq!(monster.mana(), 150);
+    assert_eq!(monster.name(), "MyMonster");
+}
+
+// Note: the rest was copied from the `roundtrip_generated_code` module in
+// `tests/integration_test.rs`. Really just making sure that everything compiles
+// here, the behavior has already been tested.
+
+fn build_mon<'a, 'b>(
+    builder: &'a mut flatbuffers::FlatBufferBuilder,
+    args: &'b my_game::example::MonsterArgs,
+) -> my_game::example::Monster<'a> {
+    let mon = my_game::example::Monster::create(builder, &args);
+    my_game::example::finish_monster_buffer(builder, mon);
+    my_game::example::get_root_as_monster(builder.finished_data())
+}
+
+#[test]
+fn vector_of_struct_store_with_type_inference() {
+    let mut b = flatbuffers::FlatBufferBuilder::new();
+    let v = b.create_vector(&[
+        my_game::example::Test::new(127, -128),
+        my_game::example::Test::new(3, 123),
+        my_game::example::Test::new(100, 101),
+    ]);
+    let name = b.create_string("foo");
+    let m = build_mon(
+        &mut b,
+        &my_game::example::MonsterArgs {
+            name: Some(name),
+            test4: Some(v),
+            ..Default::default()
+        },
+    );
+    assert_eq!(
+        m.test4().unwrap(),
+        &[
+            my_game::example::Test::new(127, -128),
+            my_game::example::Test::new(3, 123),
+            my_game::example::Test::new(100, 101)
+        ][..]
+    );
+}