1 files changed, 14 insertions, 3 deletions
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 4035347d4e..1324bdf9b8 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1141,11 +1141,14 @@ class BasicsTest < ActiveRecord::TestCase
   def test_clear_cache!
     # preheat cache
     c1 = Post.connection.schema_cache.columns("posts")
+    assert_not_equal 0, Post.connection.schema_cache.size
+
     ActiveRecord::Base.clear_cache!
+    assert_equal 0, Post.connection.schema_cache.size
+
     c2 = Post.connection.schema_cache.columns("posts")
-    c1.each_with_index do |v, i|
-      assert_not_same v, c2[i]
-    end
+    assert_not_equal 0, Post.connection.schema_cache.size
+
     assert_equal c1, c2
   end
 
@@ -1412,6 +1415,14 @@ class BasicsTest < ActiveRecord::TestCase
     assert_not_includes SymbolIgnoredDeveloper.columns_hash.keys, "first_name"
   end
 
+  test ".columns_hash raises an error if the record has an empty table name" do
+    expected_message = "FirstAbstractClass has no table configured. Set one with FirstAbstractClass.table_name="
+    exception = assert_raises(ActiveRecord::TableNotSpecified) do
+      FirstAbstractClass.columns_hash
+    end
+    assert_equal expected_message, exception.message
+  end
+
   test "ignored columns have no attribute methods" do
     assert_not_respond_to Developer.new, :first_name
     assert_not_respond_to Developer.new, :first_name=