1 files changed, 60 insertions, 0 deletions
diff --git a/third_party/rust/rayon/tests/intersperse.rs b/third_party/rust/rayon/tests/intersperse.rs
new file mode 100644
index 0000000000..aaa5b6530d
--- /dev/null
+++ b/third_party/rust/rayon/tests/intersperse.rs
@@ -0,0 +1,60 @@
+use rayon::prelude::*;
+
+#[test]
+fn check_intersperse() {
+    let v: Vec<_> = (0..1000).into_par_iter().intersperse(-1).collect();
+    assert_eq!(v.len(), 1999);
+    for (i, x) in v.into_iter().enumerate() {
+        assert_eq!(x, if i % 2 == 0 { i as i32 / 2 } else { -1 });
+    }
+}
+
+#[test]
+fn check_intersperse_again() {
+    let v: Vec<_> = (0..1000)
+        .into_par_iter()
+        .intersperse(-1)
+        .intersperse(-2)
+        .collect();
+    assert_eq!(v.len(), 3997);
+    for (i, x) in v.into_iter().enumerate() {
+        let y = match i % 4 {
+            0 => i as i32 / 4,
+            2 => -1,
+            _ => -2,
+        };
+        assert_eq!(x, y);
+    }
+}
+
+#[test]
+fn check_intersperse_unindexed() {
+    let v: Vec<_> = (0..1000).map(|i| i.to_string()).collect();
+    let s = v.join(",");
+    let s2 = v.join(";");
+    let par: String = s.par_split(',').intersperse(";").collect();
+    assert_eq!(par, s2);
+}
+
+#[test]
+fn check_intersperse_producer() {
+    (0..1000)
+        .into_par_iter()
+        .intersperse(-1)
+        .zip_eq(0..1999)
+        .for_each(|(x, i)| {
+            assert_eq!(x, if i % 2 == 0 { i / 2 } else { -1 });
+        });
+}
+
+#[test]
+fn check_intersperse_rev() {
+    (0..1000)
+        .into_par_iter()
+        .intersperse(-1)
+        .zip_eq(0..1999)
+        .rev()
+        .for_each(|(x, i)| {
+            assert_eq!(x, if i % 2 == 0 { i / 2 } else { -1 });
+        });
+}