precision: assertion helper for double arrays

Signed-off-by: Christoph Ruegg <git@cdrnet.ch>

src/Managed.UnitTests/AssertHelpers.cs

@@ -98,6 +98,24 @@ namespace MathNet.Numerics.UnitTests
             }
         }
 
+        /// <summary>
+        /// Asserts that the expected value and the actual value are equal up to a certain
+        /// maximum error.
+        /// </summary>
+        /// <param name="expected">The expected value list.</param>
+        /// <param name="actual">The actual value list.</param>
+        /// <param name="maximumError">The accuracy required for being almost equal.</param>
+        public static void AlmostEqualList(IList<double> expected, IList<double> actual, double maximumError)
+        {
+            for (int i = 0; i < expected.Count; i++)
+            {
+                if (!actual[i].AlmostEqualWithError(expected[i], maximumError))
+                {
+                    Assert.Fail("Not equal within a maximum error {0}. Expected:{1}; Actual:{2}", maximumError, expected[i], actual[i]);
+                }
+            }
+        }
+
         /// <summary>
         /// Asserts that the expected value and the actual value are equal up to a certain
         /// maximum error.