1 files changed, 113 insertions, 0 deletions
diff --git a/third_party/rust/time/src/tests.rs b/third_party/rust/time/src/tests.rs
new file mode 100644
index 0000000000..66c977d91d
--- /dev/null
+++ b/third_party/rust/time/src/tests.rs
@@ -0,0 +1,113 @@
+#![cfg(all( // require `--all-features` to be passed
+    feature = "default",
+    feature = "alloc",
+    feature = "formatting",
+    feature = "large-dates",
+    feature = "local-offset",
+    feature = "macros",
+    feature = "parsing",
+    feature = "quickcheck",
+    feature = "serde-human-readable",
+    feature = "serde-well-known",
+    feature = "std",
+    feature = "rand",
+    feature = "serde",
+))]
+#![allow(
+    clippy::let_underscore_drop,
+    clippy::clone_on_copy,
+    clippy::cognitive_complexity,
+    clippy::std_instead_of_core
+)]
+
+//! Tests for internal details.
+//!
+//! This module should only be used when it is not possible to test the implementation in a
+//! reasonable manner externally.
+
+use std::num::NonZeroU8;
+
+use crate::formatting::DigitCount;
+use crate::parsing::combinator::rfc::iso8601;
+use crate::parsing::shim::Integer;
+use crate::{duration, parsing};
+
+#[test]
+fn digit_count() {
+    assert_eq!(1_u8.num_digits(), 1);
+    assert_eq!(9_u8.num_digits(), 1);
+    assert_eq!(10_u8.num_digits(), 2);
+    assert_eq!(99_u8.num_digits(), 2);
+    assert_eq!(100_u8.num_digits(), 3);
+
+    assert_eq!(1_u16.num_digits(), 1);
+    assert_eq!(9_u16.num_digits(), 1);
+    assert_eq!(10_u16.num_digits(), 2);
+    assert_eq!(99_u16.num_digits(), 2);
+    assert_eq!(100_u16.num_digits(), 3);
+    assert_eq!(999_u16.num_digits(), 3);
+    assert_eq!(1_000_u16.num_digits(), 4);
+    assert_eq!(9_999_u16.num_digits(), 4);
+    assert_eq!(10_000_u16.num_digits(), 5);
+
+    assert_eq!(1_u32.num_digits(), 1);
+    assert_eq!(9_u32.num_digits(), 1);
+    assert_eq!(10_u32.num_digits(), 2);
+    assert_eq!(99_u32.num_digits(), 2);
+    assert_eq!(100_u32.num_digits(), 3);
+    assert_eq!(999_u32.num_digits(), 3);
+    assert_eq!(1_000_u32.num_digits(), 4);
+    assert_eq!(9_999_u32.num_digits(), 4);
+    assert_eq!(10_000_u32.num_digits(), 5);
+    assert_eq!(99_999_u32.num_digits(), 5);
+    assert_eq!(100_000_u32.num_digits(), 6);
+    assert_eq!(999_999_u32.num_digits(), 6);
+    assert_eq!(1_000_000_u32.num_digits(), 7);
+    assert_eq!(9_999_999_u32.num_digits(), 7);
+    assert_eq!(10_000_000_u32.num_digits(), 8);
+    assert_eq!(99_999_999_u32.num_digits(), 8);
+    assert_eq!(100_000_000_u32.num_digits(), 9);
+    assert_eq!(999_999_999_u32.num_digits(), 9);
+    assert_eq!(1_000_000_000_u32.num_digits(), 10);
+}
+
+#[test]
+fn default() {
+    assert_eq!(
+        duration::Padding::Optimize.clone(),
+        duration::Padding::default()
+    );
+}
+
+#[test]
+fn debug() {
+    let _ = format!("{:?}", duration::Padding::Optimize);
+    let _ = format!("{:?}", parsing::ParsedItem(b"", 0));
+    let _ = format!("{:?}", parsing::component::Period::Am);
+    let _ = format!("{:?}", iso8601::ExtendedKind::Basic);
+}
+
+#[test]
+fn clone() {
+    assert_eq!(
+        parsing::component::Period::Am.clone(),
+        parsing::component::Period::Am
+    );
+    // does not impl Debug
+    assert!(crate::time::Padding::Optimize.clone() == crate::time::Padding::Optimize);
+    // does not impl PartialEq
+    assert!(matches!(
+        iso8601::ExtendedKind::Basic.clone(),
+        iso8601::ExtendedKind::Basic
+    ));
+}
+
+#[test]
+fn parsing_internals() {
+    assert!(
+        parsing::ParsedItem(b"", ())
+            .flat_map(|_| None::<()>)
+            .is_none()
+    );
+    assert!(<NonZeroU8 as Integer>::parse_bytes(b"256").is_none());
+}