diff --git a/exercises/practice/word-count/tests/word_count.cairo b/exercises/practice/word-count/tests/word_count.cairo
index 3f3f4333..920a19bd 100644
--- a/exercises/practice/word-count/tests/word_count.cairo
+++ b/exercises/practice/word-count/tests/word_count.cairo
@@ -6,7 +6,7 @@ fn count_one_word() {
     let mut output = count_words(input);
 
     let expected = array![WordResult { word: "word", count: 1 }].span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -21,7 +21,7 @@ fn count_one_of_each_word() {
         WordResult { word: "one", count: 1 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -38,7 +38,7 @@ fn multiple_occurrences_of_a_word() {
         WordResult { word: "fish", count: 4 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -53,7 +53,7 @@ fn handles_cramped_lists() {
         WordResult { word: "three", count: 1 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -68,7 +68,7 @@ fn handles_expanded_lists() {
         WordResult { word: "three", count: 1 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -85,7 +85,7 @@ fn ignore_punctuation() {
         WordResult { word: "javascript", count: 1 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -101,7 +101,7 @@ fn include_numbers() {
     ]
         .span();
 
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -114,7 +114,7 @@ fn normalize_case() {
         WordResult { word: "go", count: 3 }, WordResult { word: "stop", count: 2 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -134,7 +134,7 @@ fn with_apostrophes() {
         WordResult { word: "it", count: 1 },
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -152,7 +152,7 @@ fn with_quotations() {
         WordResult { word: "large", count: 2 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -172,7 +172,7 @@ fn substrings_from_the_beginning() {
         WordResult { word: "a", count: 1 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -185,7 +185,7 @@ fn multiple_spaces_not_detected_as_a_word() {
         WordResult { word: "multiple", count: 1 }, WordResult { word: "whitespaces", count: 1 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -200,7 +200,7 @@ fn alternating_word_separators_not_detected_as_a_word() {
         WordResult { word: "three", count: 1 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 #[test]
@@ -213,12 +213,13 @@ fn quotation_for_word_with_apostrophe() {
         WordResult { word: "can", count: 1 }, WordResult { word: "can't", count: 2 }
     ]
         .span();
-    assert_unordered(output, expected);
+    assert_unordered_eq(output, expected);
 }
 
 
 // helper function.
-fn assert_unordered(span1: Span<WordResult>, span2: Span<WordResult>) {
+fn assert_unordered_eq(span1: Span<WordResult>, span2: Span<WordResult>) {
+    // `span1` should be subset of `span2`
     for item in span1 {
         let mut found = false;
         for other_item in span2 {
@@ -233,5 +234,21 @@ fn assert_unordered(span1: Span<WordResult>, span2: Span<WordResult>) {
             span1,
             span2
         );
+    };
+    // and `span2` should be subset of `span1`
+    for item in span2 {
+        let mut found = false;
+        for other_item in span1 {
+            if item == other_item {
+                found = true;
+                break;
+            }
+        };
+        assert!(
+            found,
+            "assertion failed: `(left == right)`\n left: `{:?}`,\n right `{:?}`",
+            span1,
+            span2
+        );
     }
 }