Updated matrix spec, better grouping for tests and row, column tests

Author: rajithv

spec/matrix_spec.rb

@@ -6,7 +6,7 @@
     its(:to_s) { is_expected.to eq "[1, 2]\n[3, 4]\n" }
   end
 
-  describe 'dense_matrix functions' do
+  describe 'dense_matrix inverse, FFLU, LU, LDL, FFLDU, det' do
     subject { SymEngine([[4, 3],[3, 2]]) }
 
     its(:inv) { is_expected.to be_a SymEngine::DenseMatrix }
@@ -20,8 +20,6 @@
 
     its(:LDL) { is_expected.to eq [SymEngine([[1, 0],[SymEngine(3)/SymEngine(4), 1]]), 
                                   SymEngine([[4, 0],[0, SymEngine(-1)/SymEngine(4)]])] }
-                                  
-    its(:FFLU) { is_expected.to eq SymEngine([[4, 3],[3, -1]]) }
 
     its(:FFLDU) { is_expected.to eq [SymEngine([[4, 0],[3, 1]]), SymEngine([[4, 0],[0, 4]]), 
                                      SymEngine([[4, 3],[0, -1]])] }
@@ -30,33 +28,51 @@
 
   end
 
-  describe 'more dense_matrix functions' do
-    
-    let(:mat1) { SymEngine([[1, 2],[3, 4]]) }
-    let(:mat2) { SymEngine([[4, 3],[2, 1]]) }
-    let(:a) { SymEngine(4) }    
-    let(:matA) { SymEngine([[3, 1, 2],[5, 7, 5], [1, 2, 3]]) }
-    let(:b) { SymEngine([[4],[4],[4]]) }
+      
+  let(:mat1) { SymEngine([[1, 2],[3, 4]]) }
+  let(:mat2) { SymEngine([[4, 3],[2, 1]]) }
+  let(:a) { SymEngine(4) }
+  let(:matA) { SymEngine([[3, 1, 2],[5, 7, 5], [1, 2, 3]]) }
+  let(:b) { SymEngine([[4],[4],[4]]) }
 
-    it do
+  describe 'dense_matrix addition, multiplication' do
 
+    it 'adds and multiplies' do
       expect(mat1 + mat2).to eq(SymEngine([[5, 5],[5, 5]]))
       expect(mat1 + a).to eq(SymEngine([[5, 6],[7, 8]]))
       expect(mat1 * mat2).to eq(SymEngine([[8, 5],[20, 13]]))
       expect(mat1 * a).to eq(SymEngine([[4, 8],[12, 16]]))
-      
+    end  
+  end
+  
+  describe 'dense_matrix transpose and submatrix' do
+    it 'performs transpose and submatrix' do
       expect(mat1.transpose).to eq(SymEngine([[1, 3],[2, 4]]))
-      
       expect(mat1.submatrix(0, 0, 1, 0, 1, 1)).to eq(SymEngine([[1],[3]]))
-
-      
+    end
+  end
+  
+  describe 'LU_solve' do
+    it 'solves Ax = b' do
       expect(matA.LU_solve(b)).to eq(SymEngine([[SymEngine(12)/SymEngine(29)],
                                              [SymEngine(-32)/SymEngine(29)],
                                              [SymEngine(56)/SymEngine(29)]
-                                             ]))
+                                             ]))  
+    end
+  end 
+
+  describe 'getter and setter' do
+    it 'gets and sets elements' do
       expect(mat1.set(0, 0, a)).to eq(SymEngine([[4, 2],[3, 4]]))
       expect(mat1.get(1, 0)).to eq(SymEngine(3))
     end
   end
 
+  describe 'rows and cols' do
+    it 'returns row and column count' do
+      expect(matA.rows). to eq (3)
+      expect(matA.cols). to eq (3)
+    end
+  end
+  
 end