add test targets, fix tests (#66)

I just realized that this is not downstream and things are not taken
care of for you: these tests never ran.

Enabled rust tests, fixed problems.

Author: mikea

kj-rs/BUILD.bazel

@@ -1,5 +1,5 @@
 load("//tools/bazel:rust_cxx_bridge.bzl", "rust_cxx_bridge")
-load("@rules_rust//rust:defs.bzl", "rust_library")
+load("@rules_rust//rust:defs.bzl", "rust_library", "rust_test")
 
 cc_library(
     name = "kj-rs-lib",
@@ -30,6 +30,12 @@ rust_library(
     ],
 )
 
+rust_test(
+    name = "kj-rs_test",
+    crate = "kj-rs",
+    edition = "2024",
+)
+
 rust_cxx_bridge(
     name = "bridge",
     src = "lib.rs",

kj-rs/date.rs

@@ -98,15 +98,15 @@ mod tests {
     }
 
     #[test]
-    fn test_from_nanoseconds() {
-        let date = KjDate::from_nanoseconds(1000000000);
-        assert_eq!(date.nanoseconds(), 1000000000);
+    fn test_from() {
+        let date = KjDate::from(1_000_000_000);
+        assert_eq!(date.nanoseconds(), 1_000_000_000);
     }
 
     #[test]
     fn test_ordering() {
-        let earlier = KjDate::from_nanoseconds(1000);
-        let later = KjDate::from_nanoseconds(2000);
+        let earlier = KjDate::from(1000);
+        let later = KjDate::from(2000);
         assert!(earlier < later);
     }
 
@@ -118,8 +118,8 @@ mod tests {
 
     #[test]
     fn test_system_time_conversion() {
-        let date = KjDate::from_nanoseconds(1000000000);
-        let system_time = date.to_system_time();
+        let date = KjDate::from(1_000_000_000);
+        let system_time: SystemTime = date.into();
         let converted_back = KjDate::from(system_time);
         assert_eq!(date, converted_back);
     }