make many std tests work in Miri

1 files changed, 14 insertions, 10 deletions

diff --git a/library/std/src/collections/hash/map/tests.rs b/library/std/src/collections/hash/map/tests.rs
index 7ebc41588b3..cb3032719fa 100644
--- a/library/std/src/collections/hash/map/tests.rs
+++ b/library/std/src/collections/hash/map/tests.rs
@@ -268,10 +268,13 @@ fn test_lots_of_insertions() {
 
     // Try this a few times to make sure we never screw up the hashmap's
     // internal state.
-    for _ in 0..10 {
+    let loops = if cfg!(miri) { 2 } else { 10 };
+    for _ in 0..loops {
         assert!(m.is_empty());
 
-        for i in 1..1001 {
+        let count = if cfg!(miri) { 101 } else { 1001 };
+
+        for i in 1..count {
             assert!(m.insert(i, i).is_none());
 
             for j in 1..=i {
@@ -279,42 +282,42 @@ fn test_lots_of_insertions() {
                 assert_eq!(r, Some(&j));
             }
 
-            for j in i + 1..1001 {
+            for j in i + 1..count {
                 let r = m.get(&j);
                 assert_eq!(r, None);
             }
         }
 
-        for i in 1001..2001 {
+        for i in count..(2 * count) {
             assert!(!m.contains_key(&i));
         }
 
         // remove forwards
-        for i in 1..1001 {
+        for i in 1..count {
             assert!(m.remove(&i).is_some());
 
             for j in 1..=i {
                 assert!(!m.contains_key(&j));
             }
 
-            for j in i + 1..1001 {
+            for j in i + 1..count {
                 assert!(m.contains_key(&j));
             }
         }
 
-        for i in 1..1001 {
+        for i in 1..count {
             assert!(!m.contains_key(&i));
         }
 
-        for i in 1..1001 {
+        for i in 1..count {
             assert!(m.insert(i, i).is_none());
         }
 
         // remove backwards
-        for i in (1..1001).rev() {
+        for i in (1..count).rev() {
             assert!(m.remove(&i).is_some());
 
-            for j in i..1001 {
+            for j in i..count {
                 assert!(!m.contains_key(&j));
             }
 
@@ -817,6 +820,7 @@ fn test_retain() {
 }
 
 #[test]
+#[cfg_attr(miri, ignore)] // Miri does not support signalling OOM
 #[cfg_attr(target_os = "android", ignore)] // Android used in CI has a broken dlmalloc
 fn test_try_reserve() {
     let mut empty_bytes: HashMap<u8, u8> = HashMap::new();