added simple no_std test

tests/no_std.rs

@@ -0,0 +1,41 @@
+#![no_std]
+
+#[cfg(test)]
+mod tests {
+    use bitmask_enum::bitmask;
+
+    #[bitmask]
+    #[bitmask_config(inverted_flags, vec_debug)]
+    enum NoStdBitmask {
+        Flag1,
+        Flag2,
+    }
+
+    #[bitmask(u8)]
+    #[bitmask_config(inverted_flags, vec_debug)]
+    enum NoStdBitmaskU8 {
+        Flag1,
+        Flag2,
+    }
+
+    #[test]
+    fn test() {
+        let mut bm = NoStdBitmask::none();
+        assert_eq!(bm, 0);
+
+        bm |= NoStdBitmask::Flag1;
+        assert_eq!(bm, NoStdBitmask::Flag1);
+
+        bm |= NoStdBitmask::InvertedFlag1;
+        assert_eq!(bm.is_all_bits(), true);
+
+        let mut bm = NoStdBitmaskU8::none();
+        assert_eq!(bm, 0);
+
+        bm |= NoStdBitmaskU8::Flag1;
+        assert_eq!(bm, NoStdBitmaskU8::Flag1);
+
+        bm |= NoStdBitmaskU8::InvertedFlag1;
+        assert_eq!(bm.is_all_bits(), true);
+    }
+}