1 files changed, 26 insertions, 0 deletions
diff --git a/activerecord/test/cases/relation/where_clause_test.rb b/activerecord/test/cases/relation/where_clause_test.rb
index b498739e84..569082541b 100644
--- a/activerecord/test/cases/relation/where_clause_test.rb
+++ b/activerecord/test/cases/relation/where_clause_test.rb
@@ -71,6 +71,32 @@ class ActiveRecord::Relation
       assert_not WhereClause.new(["anything"], []).empty?
     end
 
+    test "invert cannot handle nil" do
+      where_clause = WhereClause.new([nil], [])
+
+      assert_raises ArgumentError do
+        where_clause.invert
+      end
+    end
+
+    test "invert replaces each part of the predicate with its inverse" do
+      random_object = Object.new
+      original = WhereClause.new([
+        table["id"].in([1, 2, 3]),
+        table["id"].eq(1),
+        "sql literal",
+        random_object
+      ], [])
+      expected = WhereClause.new([
+        table["id"].not_in([1, 2, 3]),
+        table["id"].not_eq(1),
+        Arel::Nodes::Not.new(Arel::Nodes::SqlLiteral.new("sql literal")),
+        Arel::Nodes::Not.new(random_object)
+      ], [])
+
+      assert_equal expected, original.invert
+    end
+
     private
 
     def table