diff --git a/src/test/java/org/apache/commons/math3/optimization/fitting/CurveFitterTest.java b/src/test/java/org/apache/commons/math3/optimization/fitting/CurveFitterTest.java
index c39cd4383..77b29714c 100644
--- a/src/test/java/org/apache/commons/math3/optimization/fitting/CurveFitterTest.java
+++ b/src/test/java/org/apache/commons/math3/optimization/fitting/CurveFitterTest.java
@@ -18,13 +18,8 @@
 package org.apache.commons.math3.optimization.fitting;
 
 import org.apache.commons.math3.optimization.general.LevenbergMarquardtOptimizer;
-import org.apache.commons.math3.optimization.general.GaussNewtonOptimizer;
-import org.apache.commons.math3.optimization.DifferentiableMultivariateVectorOptimizer;
-import org.apache.commons.math3.optimization.SimpleVectorValueChecker;
 import org.apache.commons.math3.analysis.ParametricUnivariateFunction;
-import org.apache.commons.math3.analysis.polynomials.PolynomialFunction;
 import org.apache.commons.math3.util.FastMath;
-import org.apache.commons.math3.util.Precision;
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/org/apache/commons/math3/optimization/general/AbstractLeastSquaresOptimizerTestValidation.java b/src/test/java/org/apache/commons/math3/optimization/general/AbstractLeastSquaresOptimizerTestValidation.java
index 5d97554cd..532f443f6 100644
--- a/src/test/java/org/apache/commons/math3/optimization/general/AbstractLeastSquaresOptimizerTestValidation.java
+++ b/src/test/java/org/apache/commons/math3/optimization/general/AbstractLeastSquaresOptimizerTestValidation.java
@@ -13,7 +13,6 @@
  */
 package org.apache.commons.math3.optimization.general;
 
-import java.io.IOException;
 import java.util.Arrays;
 import java.util.List;
 import java.util.ArrayList;
@@ -24,7 +23,6 @@ import org.apache.commons.math3.stat.descriptive.StatisticalSummary;
 import org.apache.commons.math3.util.FastMath;
 import org.junit.Test;
 import org.junit.Assert;
-import org.junit.Ignore;
 
 /**
  * This class demonstrates the main functionality of the
diff --git a/src/test/java/org/apache/commons/math3/optimization/general/CircleProblem.java b/src/test/java/org/apache/commons/math3/optimization/general/CircleProblem.java
index 33d6f3681..67d4a64df 100644
--- a/src/test/java/org/apache/commons/math3/optimization/general/CircleProblem.java
+++ b/src/test/java/org/apache/commons/math3/optimization/general/CircleProblem.java
@@ -17,7 +17,6 @@
 
 package org.apache.commons.math3.optimization.general;
 
-import java.util.Arrays;
 import java.util.ArrayList;
 import org.apache.commons.math3.analysis.DifferentiableMultivariateVectorFunction;
 import org.apache.commons.math3.analysis.MultivariateMatrixFunction;
diff --git a/src/test/java/org/apache/commons/math3/optimization/general/RandomStraightLinePointGenerator.java b/src/test/java/org/apache/commons/math3/optimization/general/RandomStraightLinePointGenerator.java
index 59a1ff474..a7f6eb68f 100644
--- a/src/test/java/org/apache/commons/math3/optimization/general/RandomStraightLinePointGenerator.java
+++ b/src/test/java/org/apache/commons/math3/optimization/general/RandomStraightLinePointGenerator.java
@@ -20,8 +20,6 @@ package org.apache.commons.math3.optimization.general;
 import java.awt.geom.Point2D;
 import org.apache.commons.math3.random.RandomGenerator;
 import org.apache.commons.math3.random.Well44497b;
-import org.apache.commons.math3.util.MathUtils;
-import org.apache.commons.math3.util.FastMath;
 import org.apache.commons.math3.distribution.RealDistribution;
 import org.apache.commons.math3.distribution.UniformRealDistribution;
 import org.apache.commons.math3.distribution.NormalDistribution;
diff --git a/src/test/java/org/apache/commons/math3/optimization/general/StraightLineProblem.java b/src/test/java/org/apache/commons/math3/optimization/general/StraightLineProblem.java
index f64519cac..5e087c768 100644
--- a/src/test/java/org/apache/commons/math3/optimization/general/StraightLineProblem.java
+++ b/src/test/java/org/apache/commons/math3/optimization/general/StraightLineProblem.java
@@ -17,13 +17,10 @@
 
 package org.apache.commons.math3.optimization.general;
 
-import java.util.Arrays;
 import java.util.ArrayList;
 import org.apache.commons.math3.analysis.DifferentiableMultivariateVectorFunction;
 import org.apache.commons.math3.analysis.MultivariateMatrixFunction;
 import org.apache.commons.math3.analysis.UnivariateFunction;
-import org.apache.commons.math3.util.MathUtils;
-import org.apache.commons.math3.util.FastMath;
 import org.apache.commons.math3.stat.regression.SimpleRegression;
 
 /**