1 files changed, 54 insertions, 51 deletions
diff --git a/spec/ruby/library/matrix/diagonal_spec.rb b/spec/ruby/library/matrix/diagonal_spec.rb
index ef9738e73e..8c82433fde 100644
--- a/spec/ruby/library/matrix/diagonal_spec.rb
+++ b/spec/ruby/library/matrix/diagonal_spec.rb
@@ -1,72 +1,75 @@
 require_relative '../../spec_helper'
-require_relative 'fixtures/classes'
-require 'matrix'
 
-describe "Matrix.diagonal" do
-  before :each do
-    @m = Matrix.diagonal(10, 11, 12, 13, 14)
-  end
+ruby_version_is ""..."3.1" do
+  require_relative 'fixtures/classes'
+  require 'matrix'
 
-  it "returns an object of type Matrix" do
-    @m.should be_kind_of(Matrix)
-  end
+  describe "Matrix.diagonal" do
+    before :each do
+      @m = Matrix.diagonal(10, 11, 12, 13, 14)
+    end
 
-  it "returns a square Matrix of the right size" do
-    @m.column_size.should == 5
-    @m.row_size.should == 5
-  end
+    it "returns an object of type Matrix" do
+      @m.should be_kind_of(Matrix)
+    end
 
-  it "sets the diagonal to the arguments" do
-    (0..4).each do |i|
-      @m[i, i].should == i + 10
+    it "returns a square Matrix of the right size" do
+      @m.column_size.should == 5
+      @m.row_size.should == 5
     end
-  end
 
-  it "fills all non-diagonal cells with 0" do
-    (0..4).each do |i|
-      (0..4).each do |j|
-        if i != j
-          @m[i, j].should == 0
+    it "sets the diagonal to the arguments" do
+      (0..4).each do |i|
+        @m[i, i].should == i + 10
+      end
+    end
+
+    it "fills all non-diagonal cells with 0" do
+      (0..4).each do |i|
+        (0..4).each do |j|
+          if i != j
+            @m[i, j].should == 0
+          end
         end
       end
     end
-  end
 
-  describe "for a subclass of Matrix" do
-    it "returns an instance of that subclass" do
-      MatrixSub.diagonal(1).should be_an_instance_of(MatrixSub)
+    describe "for a subclass of Matrix" do
+      it "returns an instance of that subclass" do
+        MatrixSub.diagonal(1).should be_an_instance_of(MatrixSub)
+      end
     end
   end
-end
 
-describe "Matrix.diagonal?" do
-  it "returns true for a diagonal Matrix" do
-    Matrix.diagonal([1, 2, 3]).diagonal?.should be_true
-  end
+  describe "Matrix.diagonal?" do
+    it "returns true for a diagonal Matrix" do
+      Matrix.diagonal([1, 2, 3]).diagonal?.should be_true
+    end
 
-  it "returns true for a zero square Matrix" do
-    Matrix.zero(3).diagonal?.should be_true
-  end
+    it "returns true for a zero square Matrix" do
+      Matrix.zero(3).diagonal?.should be_true
+    end
 
-  it "returns false for a non diagonal square Matrix" do
-    Matrix[[0, 1], [0, 0]].diagonal?.should be_false
-    Matrix[[1, 2, 3], [1, 2, 3], [1, 2, 3]].diagonal?.should be_false
-  end
+    it "returns false for a non diagonal square Matrix" do
+      Matrix[[0, 1], [0, 0]].diagonal?.should be_false
+      Matrix[[1, 2, 3], [1, 2, 3], [1, 2, 3]].diagonal?.should be_false
+    end
 
-  it "returns true for an empty 0x0 matrix" do
-    Matrix.empty(0,0).diagonal?.should be_true
-  end
+    it "returns true for an empty 0x0 matrix" do
+      Matrix.empty(0,0).diagonal?.should be_true
+    end
 
-  it "raises an error for rectangular matrices" do
-    [
-      Matrix[[0], [0]],
-      Matrix[[0, 0]],
-      Matrix.empty(0, 2),
-      Matrix.empty(2, 0),
-    ].each do |rectangular_matrix|
-      -> {
-        rectangular_matrix.diagonal?
-      }.should raise_error(Matrix::ErrDimensionMismatch)
+    it "raises an error for rectangular matrices" do
+      [
+        Matrix[[0], [0]],
+        Matrix[[0, 0]],
+        Matrix.empty(0, 2),
+        Matrix.empty(2, 0),
+      ].each do |rectangular_matrix|
+        -> {
+          rectangular_matrix.diagonal?
+        }.should raise_error(Matrix::ErrDimensionMismatch)
+      end
     end
   end
 end