added first draft for lib-crates for test_random and test_random_derive (lighthouse-246)

Cargo.toml

@@ -15,6 +15,8 @@ members = [
 	"eth2/utils/ssz_derive",
 	"eth2/utils/swap_or_not_shuffle",
 	"eth2/utils/fisher_yates_shuffle",
+	"eth2/utils/test_random",
+    "eth2/utils/test_random_derive",
 	"beacon_node",
 	"beacon_node/db",
 	"beacon_node/beacon_chain",

eth2/utils/test_random/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "test_random"
+version = "0.1.0"
+authors = ["thojest <thojest@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+rand = "0.5.5"

eth2/utils/test_random/src/lib.rs

@@ -0,0 +1,39 @@
+use rand::RngCore;
+
+pub trait TestRandom<T>
+where
+    T: RngCore,
+{
+    fn random_for_test(rng: &mut T) -> Self;
+}
+
+impl<T: RngCore> TestRandom<T> for u64 {
+    fn random_for_test(rng: &mut T) -> Self {
+        rng.next_u64()
+    }
+}
+
+impl<T: RngCore> TestRandom<T> for u32 {
+    fn random_for_test(rng: &mut T) -> Self {
+        rng.next_u32()
+    }
+}
+
+impl<T: RngCore> TestRandom<T> for usize {
+    fn random_for_test(rng: &mut T) -> Self {
+        rng.next_u32() as usize
+    }
+}
+
+impl<T: RngCore, U> TestRandom<T> for Vec<U>
+where
+    U: TestRandom<T>,
+{
+    fn random_for_test(rng: &mut T) -> Self {
+        vec![
+            <U>::random_for_test(rng),
+            <U>::random_for_test(rng),
+            <U>::random_for_test(rng),
+        ]
+    }
+}

eth2/utils/test_random_derive/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "test_random_derive"
+version = "0.1.0"
+authors = ["thojest <thojest@gmail.com>"]
+edition = "2018"
+description = "Procedural derive macros for implementation of TestRandom trait"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = "0.15"
+quote = "0.6"
+test_random = {path = "../test_random"}
+

eth2/utils/test_random_derive/src/lib.rs

@@ -0,0 +1,15 @@
+extern crate proc_macro;
+
+use crate::proc_macro::TokenStream;
+use quote::quote;
+use syn;
+use syn::DeriveInput;
+
+#[proc_macro_derive(TestRandom)]
+pub fn test_random_derive(input: TokenStream) -> TokenStream {
+    let ast = syn::parse(input).unwrap();
+
+    impl_test_random(&ast)
+}
+
+fn impl_test_random(ast: &DeriveInput) -> TokenStream {}