Some updates to python and rust from reference project, started java section and go rpc/grpc sections

docs/rust/advanced/tests.md

@@ -7,6 +7,11 @@ Test functions are defined with the `#[test]` attribute.  Within the tests, we u
 For unit tests, its best to write your tests in the file that it is testing but contain it with a `mod tests` with the `cfg(test)` attribute.  This will exclude it from the final executable or library.  Unit tests also allow you to test private functions, meaning ones that are not `pub`.
 
 ```rust
+#[allow(dead_code)]
+pub fn greeting(_name: &str) -> String {
+    String::from("Hello!")
+}
+
 #[cfg(test)]
 mod tests {
     use super::*; // Use this to call functions in the current file
@@ -33,7 +38,31 @@ mod tests {
     #[test]
     #[should_panic]
     fn greater_than_100() {
-        // Something illegal
+        panic!("I'm supposed to panic")
+    }
+
+    #[test]
+    #[should_panic(expected = "Expected text")]
+    fn expect_panic_message() {
+        panic!("Expected text");
+    }
+
+    // Ignore test
+    // Can still be run on demand
+    #[test]
+    #[ignore]
+    fn expensive_test() {
+        // code that takes an hour to run
+    }
+
+    // Return a result to allow for the ? operator to be used to cause test failures
+    #[test]
+    fn result_test() -> Result<(), String> {
+        if 2 + 2 == 4 {
+            Ok(())
+        } else {
+            Err(String::from("two plus two does not equal four"))
+        }
     }
 }
 ```

docs/rust/advanced/traits.md

@@ -91,7 +91,7 @@ fn some_function<T, U>(t: &T, u: &U) -> i32
 
 ## Returning types that implement traits
 
-You can only use a trait as a return value if you are returning a single type.
+You can only use a trait as a return value if you are returning a single type.  For example, you can not have one path that returns a NewsArticle and one that returns a Tweet.
 
 ```rust
 fn returns_summarizable() -> impl Summary {

docs/rust/basics/controlflow.md

@@ -17,8 +17,11 @@ if num < 3 {
 
 ```rust
 let config_max = Some(3u8);
+let age: Result<u8, _> = "34".parse();
 if let Some(max) = config_max {
     println!("The maximum is configured to be {}", max);
+} else if let Ok(age) = age {
+    println!("Age is {}", age);
 }
 ```
 
@@ -107,10 +110,25 @@ fn value_in_cents(coin: Coin) -> u8 {
 }
 
 fn plus_one(x: Option<i32>) -> Option<i32> {
-        match x {
-            None => None,
-            Some(i) => Some(i + 1),
-        }
+    match x {
+        None => None,
+        Some(i) => Some(i + 1),
     }
+}
+
+// Or
+let x = 1;
+match x {
+    1 | 2 => println!("one or two"),
+    3 => println!("three"),
+    _ => println!("anything"),
+}
+
+// Range
+let x = 5;
+match x {
+    1..=5 => println!("one through five"),
+    _ => println!("something else"),
+}
 
 ```

docs/rust/basics/types.md

@@ -82,6 +82,21 @@ let _two = b[1];
 // let n = a[10];
 ```
 
+## Result
+
+Results allow you to handle when something returns either a value or error.  If it has a valid value, it will be of type `Ok<T>`, otherwise it will be of type `Err<E>`. See the `errors` section for more into on Results.
+
+## Option
+
+Options are similar to Results in that they can contain a conditional type.  It can be either of type `None` or type `Some<T>`.
+
+```rust
+enum Option<T> {
+    None,
+    Some(T),
+}
+```
+
 ## Type Aliases
 
 ```rust