jbonofre commented on code in PR #12897:
URL: https://github.com/apache/iceberg/pull/12897#discussion_r2061143136


##########
core/src/test/java/org/apache/iceberg/TestPartitionSpecParser.java:
##########
@@ -95,6 +96,56 @@ public void testFromJsonWithFieldId() {
     assertThat(spec.fields().get(1).fieldId()).isEqualTo(1000);
   }
 
+  @TestTemplate
+  public void testFromJsonWithSourceIds() {
+    String specString =
+        "{\n"
+            + "  \"spec-id\" : 1,\n"
+            + "  \"fields\" : [ {\n"
+            + "    \"name\" : \"id_bucket\",\n"
+            + "    \"transform\" : \"bucket[8]\",\n"
+            + "    \"source-ids\" : [ 1, 2 ],\n"
+            + "    \"field-id\" : 1001\n"
+            + "  }, {\n"
+            + "    \"name\" : \"data_bucket\",\n"
+            + "    \"transform\" : \"bucket[16]\",\n"
+            + "    \"source-ids\" : [ 2, 3 ],\n"
+            + "    \"field-id\" : 1000\n"
+            + "  } ]\n"
+            + "}";
+
+    PartitionSpec spec = PartitionSpecParser.fromJson(table.schema(), 
specString);
+
+    assertThat(spec.fields()).hasSize(2);
+    assertThat(spec.fields().get(0).sourceIds()).hasSize(2);
+    assertThat(spec.fields().get(1).sourceIds()).hasSize(2);
+  }
+
+  @TestTemplate
+  public void testFromJsonWithoutSourceIdAndSourceIds() {
+    String specString =
+        "{\n"
+            + "  \"spec-id\" : 1,\n"
+            + "  \"fields\" : [ {\n"
+            + "    \"name\" : \"id_bucket\",\n"
+            + "    \"transform\" : \"bucket[8]\",\n"
+            + "    \"field-id\" : 1001\n"
+            + "  }, {\n"
+            + "    \"name\" : \"data_bucket\",\n"
+            + "    \"transform\" : \"bucket[16]\",\n"
+            + "    \"field-id\" : 1000\n"
+            + "  } ]\n"
+            + "}";
+
+    assertThatThrownBy(
+            () -> {
+              PartitionSpecParser.fromJson(table.schema(), specString);
+            })
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessage(
+            "Cannot parse partition field, either source-id or source-ids has 
to be present");
+  }

Review Comment:
   I added a test in `TestPartitionSpecParser` testing when neither `source-id` 
and `source-ids` are provided: `testFromJsonWithoutSourceIdAndSourceIds()`.
   I will add additional tests regarding your previous mention.



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