Start adding ast build tests.

src/ast/build_tests/backtick_inner/greeting

@@ -0,0 +1 @@
+Hello, World!

src/ast/build_tests/backtick_string/mixed

@@ -0,0 +1 @@
+`Hello, ${world}!`

src/ast/build_tests/boolean_literal/false

@@ -0,0 +1 @@
+false

src/ast/build_tests/boolean_literal/true

@@ -0,0 +1 @@
+true

src/ast/mod.rs

@@ -53,4 +53,54 @@ pub mod build {
     use crate::ast::node::*;
 
     include!(concat!(env!("OUT_DIR"), "/src/ast/build.rs"));
+
+    #[cfg(test)]
+    mod build_tests {
+        use super::*;
+        use crate::parser::DeimosParser;
+        use pest::Parser;
+
+        fn parse(rule: Rule, input: &str) -> Pair<Rule> {
+            let parse_result = DeimosParser::parse(rule, input);
+            parse_result.expect("parsing failed").next().unwrap()
+        }
+
+        #[test]
+        fn boolean_literal_true() {
+            let pair = parse(
+                Rule::BooleanLiteral,
+                include_str!("build_tests/boolean_literal/true"),
+            );
+            assert_eq!(true, build_boolean_literal(pair));
+        }
+
+        #[test]
+        fn boolean_literal_false() {
+            let pair = parse(
+                Rule::BooleanLiteral,
+                include_str!("build_tests/boolean_literal/false"),
+            );
+            assert_eq!(false, build_boolean_literal(pair));
+        }
+
+        #[test]
+        fn backtick_inner_greeting() {
+            let pair = parse(
+                Rule::BacktickInner,
+                include_str!("build_tests/backtick_inner/greeting"),
+            );
+            assert_eq!("Hello, World!", build_backtick_inner(pair));
+        }
+
+        #[test]
+        fn backtick_string_mixed() {
+            let pair = parse(
+                Rule::BacktickString,
+                include_str!("build_tests/backtick_string/mixed"),
+            );
+            let backtick_string = build_backtick_string(pair);
+            assert_eq!(backtick_string.inners().count(), 2);
+            assert_eq!(backtick_string.expressions().count(), 1);
+        }
+    }
 }

src/parser/ast.yaml

@@ -628,6 +628,7 @@ ShiftExpression:
         optional: true
     - right:
         rule: Expression
+        optional: true
 ShiftOperator:
   leaf_rules:
     - LeftShift
@@ -655,6 +656,7 @@ MultiplicativeExpression:
         optional: true
     - right:
         rule: Expression
+        optional: true
 MultiplicativeOperator:
   leaf_rules:
     - Multiply
@@ -665,6 +667,8 @@ PrefixExpression:
     - operators:
         rule: PrefixOperator
         vec: true
+    - right:
+        rule: SuffixExpression
 PrefixOperator:
   leaf_rules:
     - Spread
@@ -812,7 +816,7 @@ BacktickString:
 BacktickInner:
   produce:
     kind: string
-    from: string_inner
+    from: whole_pair
 BooleanLiteral:
   produce:
     kind: boolean