1 files changed, 21 insertions, 18 deletions
diff --git a/spec/ruby/library/matrix/upper_triangular_spec.rb b/spec/ruby/library/matrix/upper_triangular_spec.rb
index 2514294a80..cc2aeb7233 100644
--- a/spec/ruby/library/matrix/upper_triangular_spec.rb
+++ b/spec/ruby/library/matrix/upper_triangular_spec.rb
@@ -1,24 +1,27 @@
 require_relative '../../spec_helper'
-require 'matrix'
 
-describe "Matrix.upper_triangular?" do
-  it "returns true for an upper triangular Matrix" do
-    Matrix[[1, 2, 3], [0, 2, 3], [0, 0, 3]].upper_triangular?.should be_true
-    Matrix.diagonal([1, 2, 3]).upper_triangular?.should be_true
-    Matrix[[1, 2], [0, 2], [0, 0], [0, 0]].upper_triangular?.should be_true
-    Matrix[[1, 2, 3, 4], [0, 2, 3, 4]].upper_triangular?.should be_true
-  end
+ruby_version_is ""..."3.1" do
+  require 'matrix'
 
-  it "returns false for a non upper triangular square Matrix" do
-    Matrix[[0, 0], [1, 0]].upper_triangular?.should be_false
-    Matrix[[1, 2, 3], [1, 2, 3], [1, 2, 3]].upper_triangular?.should be_false
-    Matrix[[0, 0], [0, 0], [0, 0], [0, 1]].upper_triangular?.should be_false
-    Matrix[[0, 0, 0, 0], [1, 0, 0, 0]].upper_triangular?.should be_false
-  end
+  describe "Matrix.upper_triangular?" do
+    it "returns true for an upper triangular Matrix" do
+      Matrix[[1, 2, 3], [0, 2, 3], [0, 0, 3]].upper_triangular?.should be_true
+      Matrix.diagonal([1, 2, 3]).upper_triangular?.should be_true
+      Matrix[[1, 2], [0, 2], [0, 0], [0, 0]].upper_triangular?.should be_true
+      Matrix[[1, 2, 3, 4], [0, 2, 3, 4]].upper_triangular?.should be_true
+    end
+
+    it "returns false for a non upper triangular square Matrix" do
+      Matrix[[0, 0], [1, 0]].upper_triangular?.should be_false
+      Matrix[[1, 2, 3], [1, 2, 3], [1, 2, 3]].upper_triangular?.should be_false
+      Matrix[[0, 0], [0, 0], [0, 0], [0, 1]].upper_triangular?.should be_false
+      Matrix[[0, 0, 0, 0], [1, 0, 0, 0]].upper_triangular?.should be_false
+    end
 
-  it "returns true for an empty matrix" do
-    Matrix.empty(3,0).upper_triangular?.should be_true
-    Matrix.empty(0,3).upper_triangular?.should be_true
-    Matrix.empty(0,0).upper_triangular?.should be_true
+    it "returns true for an empty matrix" do
+      Matrix.empty(3,0).upper_triangular?.should be_true
+      Matrix.empty(0,3).upper_triangular?.should be_true
+      Matrix.empty(0,0).upper_triangular?.should be_true
+    end
   end
 end