tomtongue commented on code in PR #10039:
URL: https://github.com/apache/iceberg/pull/10039#discussion_r1542341876


##########
core/src/test/java/org/apache/iceberg/TestMetrics.java:
##########
@@ -766,24 +771,25 @@ protected void assertCounts(int fieldId, Long valueCount, 
Long nullValueCount, M
 
   protected void assertCounts(
       int fieldId, Long valueCount, Long nullValueCount, Long nanValueCount, 
Metrics metrics) {
-    Map<Integer, Long> valueCounts = metrics.valueCounts();
-    Map<Integer, Long> nullValueCounts = metrics.nullValueCounts();
-    Map<Integer, Long> nanValueCounts = metrics.nanValueCounts();
-    Assert.assertEquals(valueCount, valueCounts.get(fieldId));
-    Assert.assertEquals(nullValueCount, nullValueCounts.get(fieldId));
-    Assert.assertEquals(nanValueCount, nanValueCounts.get(fieldId));
+    assertThat(metrics.valueCounts().get(fieldId)).isEqualTo(valueCount);
+    
assertThat(metrics.nullValueCounts().get(fieldId)).isEqualTo(nullValueCount);
+    assertThat(metrics.nanValueCounts().get(fieldId)).isEqualTo(nanValueCount);
   }
 
   protected <T> void assertBounds(
       int fieldId, Type type, T lowerBound, T upperBound, Metrics metrics) {
     Map<Integer, ByteBuffer> lowerBounds = metrics.lowerBounds();
     Map<Integer, ByteBuffer> upperBounds = metrics.upperBounds();
 
-    Assert.assertEquals(
-        lowerBound,
-        lowerBounds.containsKey(fieldId) ? fromByteBuffer(type, 
lowerBounds.get(fieldId)) : null);
-    Assert.assertEquals(
-        upperBound,
-        upperBounds.containsKey(fieldId) ? fromByteBuffer(type, 
upperBounds.get(fieldId)) : null);
+    assertThat(
+            lowerBounds.containsKey(fieldId)
+                ? Optional.ofNullable(fromByteBuffer(type, 
lowerBounds.get(fieldId))).get()

Review Comment:
   This part throws compilation failure because of the [ambiguous 
error](http://joel-costigliola.github.io/assertj/assertj-core.html#ambiguous-compilation-error)
 (at least in Java 8 and 17) of reference to `assertThat` if it's only 
`fromByteBuffer(...)`. The other workaround is to use type-cast here. We can 
also use `(Object)` cast like:
   
   ```java
   assertThat(
               lowerBounds.containsKey(fieldId)
                   ? (Object) fromByteBuffer(type, lowerBounds.get(fieldId))
                   : null)
           .isEqualTo(lowerBound);
   ```
   
   What do you think about this?



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