Add some basic unit tests

src/text_query.rs

@@ -522,3 +522,26 @@ pub fn parse_expr(mut iter: &mut Iter) -> Expr {
         _ => left
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn add_assoc() {
+        let res = parse_expr(&mut TokenIterator::new("a + b - c + d - e").peekable());
+        assert_eq!(res.to_string(), "(((a + b) - c) + d) - e");
+    }
+
+    #[test]
+    fn mul_assoc() {
+        let res = parse_expr(&mut TokenIterator::new("a b * c / d / e f g").peekable());
+        assert_eq!(res.to_string(), "((a b c / d) / e) f g");
+    }
+
+    #[test]
+    fn suffix_prec() {
+        let res = parse_expr(&mut TokenIterator::new("a b °C + x y °F").peekable());
+        assert_eq!(res.to_string(), "a b °C + x y °F");
+    }
+}

tests/query.rs

@@ -0,0 +1,23 @@
+extern crate rink;
+
+use rink::*;
+
+thread_local! {
+    static CONTEXT: Context = load().unwrap();
+}
+
+fn test(input: &str, output: &str) {
+    let mut iter = text_query::TokenIterator::new(input.trim()).peekable();
+    let expr = text_query::parse_expr(&mut iter);
+    CONTEXT.with(|ctx| {
+        let res = ctx.eval_outer(&expr);
+        assert_eq!(res.as_ref().map(|x| x.as_ref()), Ok(output));
+    });
+}
+
+#[test]
+fn test_queries() {
+    test("watt", "Definition: watt = J / s = kg m^2 / s^3 (power)");
+    test("5 inch", "0.127 m (length)");
+    test("5 inch -> cm", "12.7 cm (length)");
+}