add test_float_constants to capnpc-test

Author: dwrensha

capnpc/test/test.capnp

@@ -691,14 +691,17 @@ struct TestConstants {
 
 const globalInt :UInt32 = 12345;
 
-struct TestNonFiniteFloatConsts {
+struct TestFloatConsts {
   const a :Float32 = inf;
   const b :Float32 = -inf;
   const c :Float32 = nan;
 
   const x :Float64 = inf;
   const y :Float64 = -inf;
   const z :Float64 = nan;
+
+  const pi32 : Float32 = 3.14159265358979323846264338327950288;
+  const pi64 : Float64 = 3.14159265358979323846264338327950288;
 }
 
 interface TestInterface {

capnpc/test/test.rs

@@ -1201,6 +1201,30 @@ mod tests {
         assert_eq!(struct_list.get(2).get_text_field().unwrap(), "structlist 3");
     }
 
+    #[test]
+    fn test_float_constants() {
+        use crate::test_capnp::test_float_consts;
+
+        assert!(test_float_consts::A.is_infinite());
+        assert!(test_float_consts::A.is_sign_positive());
+
+        assert!(test_float_consts::B.is_infinite());
+        assert!(test_float_consts::B.is_sign_negative());
+
+        assert!(test_float_consts::C.is_nan());
+
+        assert!(test_float_consts::X.is_infinite());
+        assert!(test_float_consts::X.is_sign_positive());
+
+        assert!(test_float_consts::Y.is_infinite());
+        assert!(test_float_consts::Y.is_sign_negative());
+
+        assert!(test_float_consts::Z.is_nan());
+
+        assert_eq!(test_float_consts::PI32, std::f32::consts::PI);
+        assert_eq!(test_float_consts::PI64, std::f64::consts::PI);
+    }
+
     #[test]
     fn test_set_root() {
         use crate::test_capnp::test_big_struct;