Ensure test cases are symmetric (required by solvers like CG)

Author: ma-sadeghi

test/basictests.jl

@@ -19,10 +19,12 @@ b2 = rand(n);
 x2 = zero(b);
 # Complex systems + mismatch types with eltype(tol)
 A3 = (A .+ rand(n) .* im) .|> ComplexF32;
+# Make sure A3 is posdef symmetric (some solvers require this, like CG)
+A3 = A3 + A3' + 100 * I
 b3 = rand(n) .|> ComplexF32;
 x3 = zero(b) .|> ComplexF32;
 # A4 is similar to A3; created to test cache reuse
-A4 = (A .+ rand(n) .* im) .|> ComplexF32;
+A4 = A3 / 2;
 b4 = b3 / 4 .|> ComplexF32;
 x4 = zero(b) .|> ComplexF32;