diff --git a/test/matrix/test_matrix.rb b/test/matrix/test_matrix.rb
index bef03fa..14d9f91 100644
--- a/test/matrix/test_matrix.rb
+++ b/test/matrix/test_matrix.rb
@@ -274,6 +274,34 @@ class TestMatrix < Test::Unit::TestCase
     assert_raise(ExceptionForMatrix::ErrDimensionMismatch) { Matrix[[2,0,1],[0,-2,2]].cofactor(0, 0) }
   end
 
+  def test_row_merge
+    assert_equal(Matrix.empty(0, 4), Matrix.empty(0, 2).row_merge(Matrix.empty(0, 2)))
+    assert_equal(Matrix[[1, 2, 3]], Matrix[[1]].row_merge(Matrix[[2, 3]]))
+
+    assert_equal(
+      Matrix[[1, 2, 5, 6, 7], [3, 4, 8, 9, 10]],
+      Matrix[[1, 2], [3, 4]].row_merge(Matrix[[5, 6, 7], [8, 9, 10]])
+    )
+
+    assert_equal(
+      Matrix[[1, 2, 5], [3, 4, 6]],
+      Matrix[[1, 2], [3, 4]].row_merge(Matrix[[5], [6]])
+    )
+
+    assert_equal(
+      Matrix[[1, 2, 5, 7], [3, 4, 6, 8]],
+      Matrix[[1, 2], [3, 4]].row_merge(Matrix[[5], [6]], Matrix[[7], [8]])
+    )
+
+    assert_raise(ExceptionForMatrix::ErrDimensionMismatch) do
+      Matrix[[1, 2], [3, 4]].row_merge(Matrix[[5, 6], [7, 8], [9, 10]])
+    end
+
+    assert_raise(ExceptionForMatrix::ErrDimensionMismatch) do
+      Matrix[[1, 2], [3, 4]].row_merge(Matrix[[5, 6]])
+    end
+  end
+
   def test_column_merge
     assert_equal(Matrix.empty(4, 0), Matrix.empty(2, 0).column_merge(Matrix.empty(2, 0)))
     assert_equal(Matrix[[1], [2], [3]], Matrix[[1]].column_merge(Matrix[[2], [3]]))