Add unit tests for matfaust.lazylinop.sum.

[skip ci]

misc/test/src/Matlab/LazyLinearOpSumTest.m

+classdef LazyLinearOpSumTest < LazyLinearOpTest
+
+	properties (Constant = true)
+        %
+	end
+
+	methods(TestClassSetup)
+	end
+
+    methods (TestMethodSetup)
+
+        function addFaustToPath(this)
+			addpath(this.faust_paths{:})
+        	set_path
+		end
+
+		function instantiateTestFaust(this)
+            import matfaust.rand
+            A = rand(12, 14);
+            B = rand(12, 14);
+            C = rand(12, 14);
+            function S = add(varargin)
+                S = 0;
+                for i=1:length(varargin)
+                    S = S + varargin{i};
+                end
+            end
+			this.lop = matfaust.lazylinop.sum(A, B, C)
+            this.lopA = add(full(A), full(B), full(C));
+			this.lop2 = matfaust.lazylinop.sum(A+A, B+B, C+C);
+            this.lop2A = add(2*full(A), 2*full(B), 2*full(C));
+			this.lop3 = matfaust.lazylinop.sum(C.', B.', A.');
+            this.lop3A = add(full(C.'), full(B.'), full(A.'));
+		end
+    end
+
+	methods(TestMethodTeardown)
+
+	end
+
+end