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erans pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/commons-numbers.git

commit de949a139839afd9be005c4fcbba47d323dea7ac
Author: Eitan Adler <[email protected]>
AuthorDate: Sun Jun 9 22:28:24 2019 -0700

    Simplify junit
---
 .../commons/numbers/angle/PlaneAngleTest.java      |  6 +--
 .../numbers/combinatorics/CombinationsTest.java    |  2 +-
 .../commons/numbers/complex/ComplexTest.java       | 44 +++++++++++-----------
 .../commons/numbers/core/ArithmeticUtilsTest.java  |  2 +-
 .../apache/commons/numbers/core/PrecisionTest.java |  8 ++--
 .../commons/numbers/fraction/BigFractionTest.java  | 14 +++----
 .../commons/numbers/fraction/FractionTest.java     | 16 ++++----
 .../commons/numbers/quaternion/QuaternionTest.java | 38 +++++++++----------
 .../numbers/rootfinder/BrentSolverTest.java        | 10 ++---
 9 files changed, 70 insertions(+), 70 deletions(-)

diff --git 
a/commons-numbers-angle/src/test/java/org/apache/commons/numbers/angle/PlaneAngleTest.java
 
b/commons-numbers-angle/src/test/java/org/apache/commons/numbers/angle/PlaneAngleTest.java
index a33b3a6..48e7f21 100644
--- 
a/commons-numbers-angle/src/test/java/org/apache/commons/numbers/angle/PlaneAngleTest.java
+++ 
b/commons-numbers-angle/src/test/java/org/apache/commons/numbers/angle/PlaneAngleTest.java
@@ -161,20 +161,20 @@ public class PlaneAngleTest {
         final double value = 12345.6789;
         final PlaneAngle a = PlaneAngle.ofRadians(value);
         final PlaneAngle b = PlaneAngle.ofRadians(value);
-        Assert.assertTrue(a.equals(b));
+        Assert.assertEquals(a, b);
     }
     @Test
     public void testEquals2() {
         final PlaneAngle a = PlaneAngle.ofRadians(153768.373486587);
         final PlaneAngle b = null;
-        Assert.assertFalse(a.equals(b));
+        Assert.assertNotEquals(a, b);
     }
     @Test
     public void testEquals3() {
         final double value = 0.987654321;
         final PlaneAngle a = PlaneAngle.ofRadians(value);
         final PlaneAngle b = PlaneAngle.ofRadians(value + 1e-16);
-        Assert.assertFalse(a.equals(b));
+        Assert.assertNotEquals(a, b);
     }
 
     @Test
diff --git 
a/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/CombinationsTest.java
 
b/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/CombinationsTest.java
index ee27e89..0b768c2 100644
--- 
a/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/CombinationsTest.java
+++ 
b/commons-numbers-combinatorics/src/test/java/org/apache/commons/numbers/combinatorics/CombinationsTest.java
@@ -175,7 +175,7 @@ public class CombinationsTest {
 
             // Check that the sequence of iterates is ordered.
             if (lastIterate != null) {
-                Assertions.assertTrue(comp.compare(iterate, lastIterate) == 1);
+                Assertions.assertEquals(1, comp.compare(iterate, lastIterate));
             }
 
             // Check that each iterate is ordered.
diff --git 
a/commons-numbers-complex/src/test/java/org/apache/commons/numbers/complex/ComplexTest.java
 
b/commons-numbers-complex/src/test/java/org/apache/commons/numbers/complex/ComplexTest.java
index 014aeb6..9dff601 100644
--- 
a/commons-numbers-complex/src/test/java/org/apache/commons/numbers/complex/ComplexTest.java
+++ 
b/commons-numbers-complex/src/test/java/org/apache/commons/numbers/complex/ComplexTest.java
@@ -384,7 +384,7 @@ public class ComplexTest {
     @Test
     public void testEqualsNull() {
         Complex x = Complex.ofCartesian(3.0, 4.0);
-        Assertions.assertFalse(x.equals(null));
+        Assertions.assertNotEquals(null, x);
     }
 
     @Test
@@ -404,13 +404,13 @@ public class ComplexTest {
     @Test
     public void testEqualsClass() {
         Complex x = Complex.ofCartesian(3.0, 4.0);
-        Assertions.assertFalse(x.equals(this));
+        Assertions.assertNotEquals(x, this);
     }
 
     @Test
     public void testEqualsSame() {
         Complex x = Complex.ofCartesian(3.0, 4.0);
-        Assertions.assertTrue(x.equals(x));
+        Assertions.assertEquals(x, x);
     }
 
     @Test
@@ -421,7 +421,7 @@ public class ComplexTest {
         final Complex x = Complex.ofCartesian(re, im);
         Complex y = Complex.ofCartesian(re, im);
 
-        Assertions.assertTrue(x.equals(y));
+        Assertions.assertEquals(x, y);
         Assertions.assertTrue(Complex.equals(x, y));
 
         final int maxUlps = 5;
@@ -494,30 +494,30 @@ public class ComplexTest {
     public void testEqualsTrue() {
         Complex x = Complex.ofCartesian(3.0, 4.0);
         Complex y = Complex.ofCartesian(3.0, 4.0);
-        Assertions.assertTrue(x.equals(y));
+        Assertions.assertEquals(x, y);
     }
 
     @Test
     public void testEqualsRealDifference() {
         Complex x = Complex.ofCartesian(0.0, 0.0);
         Complex y = Complex.ofCartesian(0.0 + Double.MIN_VALUE, 0.0);
-        Assertions.assertFalse(x.equals(y));
+        Assertions.assertNotEquals(x, y);
     }
 
     @Test
     public void testEqualsImaginaryDifference() {
         Complex x = Complex.ofCartesian(0.0, 0.0);
         Complex y = Complex.ofCartesian(0.0, 0.0 + Double.MIN_VALUE);
-        Assertions.assertFalse(x.equals(y));
+        Assertions.assertNotEquals(x, y);
     }
 
     @Test
     public void testHashCode() {
         Complex x = Complex.ofCartesian(0.0, 0.0);
         Complex y = Complex.ofCartesian(0.0, 0.0 + Double.MIN_VALUE);
-        Assertions.assertFalse(x.hashCode()==y.hashCode());
+        Assertions.assertNotEquals(x.hashCode(), y.hashCode());
         y = Complex.ofCartesian(0.0 + Double.MIN_VALUE, 0.0);
-        Assertions.assertFalse(x.hashCode()==y.hashCode());
+        Assertions.assertNotEquals(x.hashCode(), y.hashCode());
         Complex realNaN = Complex.ofCartesian(Double.NaN, 0.0);
         Complex imaginaryNaN = Complex.ofCartesian(0.0, Double.NaN);
         Assertions.assertEquals(realNaN.hashCode(), imaginaryNaN.hashCode());
@@ -531,12 +531,12 @@ public class ComplexTest {
         x = Complex.ofCartesian(0.0, 0.0);
         y = Complex.ofCartesian(0.0, -0.0);
         Assertions.assertTrue(x.hashCode() != y.hashCode());
-        Assertions.assertFalse(x.equals(y), msg);
+        Assertions.assertNotEquals(x, y, msg);
 
         x = Complex.ofCartesian(0.0, 0.0);
         y = Complex.ofCartesian(-0.0, 0.0);
         Assertions.assertTrue(x.hashCode() != y.hashCode());
-        Assertions.assertFalse(x.equals(y), msg);
+        Assertions.assertNotEquals(x, y, msg);
     }
 
     @Test
@@ -840,16 +840,16 @@ public class ComplexTest {
 
     @Test
     public void testParse() {
-        
Assertions.assertTrue(Complex.ZERO.equals(Complex.parse(Complex.ZERO.toString())));
-        
Assertions.assertTrue(Complex.ONE.equals(Complex.parse(Complex.ONE.toString())));
-        
Assertions.assertTrue(Complex.I.equals(Complex.parse(Complex.I.toString())));
-        
Assertions.assertTrue(Complex.INF.equals(Complex.parse(Complex.INF.toString())));
-        Assertions.assertTrue(NAN.equals(Complex.parse(NAN.toString())));
-        Assertions.assertTrue(oneInf.equals(Complex.parse(oneInf.toString())));
-        
Assertions.assertTrue(negInfZero.equals(Complex.parse(negInfZero.toString())));
-        
Assertions.assertTrue(Complex.ofReal(pi).equals(Complex.parse(Complex.ofReal(pi).toString())));
-        Assertions.assertTrue(Complex.ofPolar(2, 
pi).equals(Complex.parse(Complex.ofPolar(2, pi).toString())));
-        
Assertions.assertTrue(Complex.ofCis(pi).equals(Complex.parse(Complex.ofCis(pi).toString())));
+        Assertions.assertEquals(Complex.ZERO, 
Complex.parse(Complex.ZERO.toString()));
+        Assertions.assertEquals(Complex.ONE, 
Complex.parse(Complex.ONE.toString()));
+        Assertions.assertEquals(Complex.I, 
Complex.parse(Complex.I.toString()));
+        Assertions.assertEquals(Complex.INF, 
Complex.parse(Complex.INF.toString()));
+        Assertions.assertEquals(NAN, Complex.parse(NAN.toString()));
+        Assertions.assertEquals(oneInf, Complex.parse(oneInf.toString()));
+        Assertions.assertEquals(negInfZero, 
Complex.parse(negInfZero.toString()));
+        Assertions.assertEquals(Complex.ofReal(pi), 
Complex.parse(Complex.ofReal(pi).toString()));
+        Assertions.assertEquals(Complex.ofPolar(2, pi), 
Complex.parse(Complex.ofPolar(2, pi).toString()));
+        Assertions.assertEquals(Complex.ofCis(pi), 
Complex.parse(Complex.ofCis(pi).toString()));
     }
 
     @Test
@@ -900,6 +900,6 @@ public class ComplexTest {
         final double re = 1.234;
         final double im = 5.678;
         final String str = "(  " + re + "  , " + im + "     )";
-        Assertions.assertTrue(Complex.ofCartesian(re, 
im).equals(Complex.parse(str)));
+        Assertions.assertEquals(Complex.ofCartesian(re, im), 
Complex.parse(str));
     }
 }
diff --git 
a/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/ArithmeticUtilsTest.java
 
b/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/ArithmeticUtilsTest.java
index 1ff7937..ea4fd30 100644
--- 
a/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/ArithmeticUtilsTest.java
+++ 
b/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/ArithmeticUtilsTest.java
@@ -559,7 +559,7 @@ public class ArithmeticUtilsTest {
         }
         for (int i = 0; i < expected.length; i++) {
             final boolean actual = ArithmeticUtils.isPowerOfTwo(i);
-            Assertions.assertTrue(actual == expected[i], Integer.toString(i));
+            Assertions.assertEquals(actual, expected[i], Integer.toString(i));
         }
     }
 
diff --git 
a/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/PrecisionTest.java
 
b/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/PrecisionTest.java
index 07f7634..9433a63 100644
--- 
a/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/PrecisionTest.java
+++ 
b/commons-numbers-core/src/test/java/org/apache/commons/numbers/core/PrecisionTest.java
@@ -64,8 +64,8 @@ public class PrecisionTest {
                     
Assertions.assertTrue(Precision.equalsIncludingNaN(testArray[i], testArray[j]));
                     
Assertions.assertTrue(Precision.equalsIncludingNaN(testArray[j], testArray[i]));
                 } else {
-                    
Assertions.assertTrue(!Precision.equalsIncludingNaN(testArray[i], 
testArray[j]));
-                    
Assertions.assertTrue(!Precision.equalsIncludingNaN(testArray[j], 
testArray[i]));
+                    
Assertions.assertFalse(Precision.equalsIncludingNaN(testArray[i], 
testArray[j]));
+                    
Assertions.assertFalse(Precision.equalsIncludingNaN(testArray[j], 
testArray[i]));
                 }
             }
         }
@@ -417,10 +417,10 @@ public class PrecisionTest {
                                                    Double.POSITIVE_INFINITY);
 
         // a) 1 + EPSILON is equal to 1.
-        Assertions.assertTrue(1 + Precision.EPSILON == 1);
+        Assertions.assertEquals(1, 1 + Precision.EPSILON);
 
         // b) 1 + "the number after EPSILON" is not equal to 1.
-        Assertions.assertFalse(1 + afterEpsilon == 1);
+        Assertions.assertNotEquals(1, 1 + afterEpsilon, 0.0);
     }
 
     @Test
diff --git 
a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/BigFractionTest.java
 
b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/BigFractionTest.java
index 52dd953..0f154b9 100644
--- 
a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/BigFractionTest.java
+++ 
b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/BigFractionTest.java
@@ -596,22 +596,22 @@ public class BigFractionTest {
     public void testEqualsAndHashCode() {
         BigFraction zero = BigFraction.of(0, 1);
         BigFraction nullFraction = null;
-        Assert.assertTrue(zero.equals(zero));
-        Assert.assertFalse(zero.equals(nullFraction));
-        Assert.assertFalse(zero.equals(Double.valueOf(0)));
+        Assert.assertEquals(zero, zero);
+        Assert.assertNotEquals(zero, nullFraction);
+        Assert.assertNotEquals(zero, Double.valueOf(0), 0.0);
         BigFraction zero2 = BigFraction.of(0, 2);
-        Assert.assertTrue(zero.equals(zero2));
+        Assert.assertEquals(zero, zero2);
         Assert.assertEquals(zero.hashCode(), zero2.hashCode());
         BigFraction one = BigFraction.of(1, 1);
         Assert.assertFalse((one.equals(zero) || zero.equals(one)));
-        Assert.assertTrue(one.equals(BigFraction.ONE));
+        Assert.assertEquals(one, BigFraction.ONE);
     }
 
     @Test
     public void testGetReducedFraction() {
         BigFraction threeFourths = BigFraction.of(3, 4);
-        
Assert.assertTrue(threeFourths.equals(BigFraction.getReducedFraction(6, 8)));
-        
Assert.assertTrue(BigFraction.ZERO.equals(BigFraction.getReducedFraction(0, 
-1)));
+        Assert.assertEquals(threeFourths, BigFraction.getReducedFraction(6, 
8));
+        Assert.assertEquals(BigFraction.ZERO, 
BigFraction.getReducedFraction(0, -1));
         try {
             BigFraction.getReducedFraction(1, 0);
             Assert.fail("expecting ArithmeticException");
diff --git 
a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java
 
b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java
index 30c9d33..0b95245 100644
--- 
a/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java
+++ 
b/commons-numbers-fraction/src/test/java/org/apache/commons/numbers/fraction/FractionTest.java
@@ -247,11 +247,11 @@ public class FractionTest {
     public void testMath1261() {
         final Fraction a = Fraction.of(Integer.MAX_VALUE, 2);
         final Fraction b = a.multiply(2);
-        Assert.assertTrue(b.equals(Fraction.of(Integer.MAX_VALUE)));
+        Assert.assertEquals(b, Fraction.of(Integer.MAX_VALUE));
 
         final Fraction c = Fraction.of(2, Integer.MAX_VALUE);
         final Fraction d = c.divide(2);
-        Assert.assertTrue(d.equals(Fraction.of(1, Integer.MAX_VALUE)));
+        Assert.assertEquals(d, Fraction.of(1, Integer.MAX_VALUE));
     }
 
     @Test
@@ -583,11 +583,11 @@ public class FractionTest {
     public void testEqualsAndHashCode() {
         Fraction zero  = Fraction.of(0,1);
         Fraction nullFraction = null;
-        Assert.assertTrue( zero.equals(zero));
-        Assert.assertFalse(zero.equals(nullFraction));
-        Assert.assertFalse(zero.equals(Double.valueOf(0)));
+        Assert.assertEquals(zero, zero);
+        Assert.assertNotEquals(zero, nullFraction);
+        Assert.assertNotEquals(zero, Double.valueOf(0), 0.0);
         Fraction zero2 = Fraction.of(0,2);
-        Assert.assertTrue(zero.equals(zero2));
+        Assert.assertEquals(zero, zero2);
         Assert.assertEquals(zero.hashCode(), zero2.hashCode());
         Fraction one = Fraction.of(1,1);
         Assert.assertFalse((one.equals(zero) ||zero.equals(one)));
@@ -596,8 +596,8 @@ public class FractionTest {
     @Test
     public void testGetReducedFraction() {
         Fraction threeFourths = Fraction.of(3, 4);
-        Assert.assertTrue(threeFourths.equals(Fraction.getReducedFraction(6, 
8)));
-        Assert.assertTrue(Fraction.ZERO.equals(Fraction.getReducedFraction(0, 
-1)));
+        Assert.assertEquals(threeFourths, Fraction.getReducedFraction(6, 8));
+        Assert.assertEquals(Fraction.ZERO, Fraction.getReducedFraction(0, -1));
         try {
             Fraction.getReducedFraction(1, 0);
             Assert.fail("expecting ArithmeticException");
diff --git 
a/commons-numbers-quaternion/src/test/java/org/apache/commons/numbers/quaternion/QuaternionTest.java
 
b/commons-numbers-quaternion/src/test/java/org/apache/commons/numbers/quaternion/QuaternionTest.java
index f82e6b7..31e6852 100644
--- 
a/commons-numbers-quaternion/src/test/java/org/apache/commons/numbers/quaternion/QuaternionTest.java
+++ 
b/commons-numbers-quaternion/src/test/java/org/apache/commons/numbers/quaternion/QuaternionTest.java
@@ -35,16 +35,16 @@ public class QuaternionTest {
     @Test
     public void testUnitQuaternions() {
         Assertions.assertEquals(1, Quaternion.ONE.norm(), 0d);
-        Assertions.assertTrue(Quaternion.ONE.normalize() == Quaternion.ONE);
+        Assertions.assertSame(Quaternion.ONE.normalize(), Quaternion.ONE);
 
         Assertions.assertEquals(1, Quaternion.I.norm(), 0d);
-        Assertions.assertTrue(Quaternion.I.normalize() == Quaternion.I);
+        Assertions.assertSame(Quaternion.I.normalize(), Quaternion.I);
 
         Assertions.assertEquals(1, Quaternion.J.norm(), 0d);
-        Assertions.assertTrue(Quaternion.J.normalize() == Quaternion.J);
+        Assertions.assertSame(Quaternion.J.normalize(), Quaternion.J);
 
         Assertions.assertEquals(1, Quaternion.K.norm(), 0d);
-        Assertions.assertTrue(Quaternion.K.normalize() == Quaternion.K);
+        Assertions.assertSame(Quaternion.K.normalize(), Quaternion.K);
     }
 
     @Test
@@ -330,7 +330,7 @@ public class QuaternionTest {
 
         Assertions.assertEquals(1, versor.norm(), 0);
 
-        Assertions.assertTrue(versor.normalize() == versor);
+        Assertions.assertSame(versor.normalize(), versor);
     }
 
     @Test
@@ -370,24 +370,24 @@ public class QuaternionTest {
     public final void testObjectEquals() {
         final double one = 1;
         final Quaternion q1 = Quaternion.of(one, one, one, one);
-        Assertions.assertTrue(q1.equals(q1));
+        Assertions.assertEquals(q1, q1);
 
         final Quaternion q2 = Quaternion.of(one, one, one, one);
-        Assertions.assertTrue(q2.equals(q1));
+        Assertions.assertEquals(q2, q1);
 
         final Quaternion q3 = Quaternion.of(one, Math.nextUp(one), one, one);
-        Assertions.assertFalse(q3.equals(q1));
+        Assertions.assertNotEquals(q3, q1);
 
-        Assertions.assertFalse(q3.equals("bar"));
+        Assertions.assertNotEquals("bar", q3);
     }
 
     @Test
     public void testHashCode() {
         Quaternion x = Quaternion.of(0.0, 0.0, 0.0, 0.0);
         Quaternion y = Quaternion.of(0.0, 0.0 + Double.MIN_VALUE, 0.0, 0.0);
-        Assertions.assertFalse(x.hashCode()==y.hashCode());
+        Assertions.assertNotEquals(x.hashCode(), y.hashCode());
         y = Quaternion.of(0.0 + Double.MIN_VALUE, 0.0, 0.0, 0.0);
-        Assertions.assertFalse(x.hashCode()==y.hashCode());
+        Assertions.assertNotEquals(x.hashCode(), y.hashCode());
 
         // "equals" and "hashCode" must be compatible: if two objects have
         // different hash codes, "equals" must return false.
@@ -396,22 +396,22 @@ public class QuaternionTest {
         x = Quaternion.of(0.0, 0.0, 0.0, 0.0);
         y = Quaternion.of(-0.0, 0.0, 0.0, 0.0);
         Assertions.assertTrue(x.hashCode() != y.hashCode());
-        Assertions.assertFalse(x.equals(y), msg);
+        Assertions.assertNotEquals(x, y, msg);
 
         x = Quaternion.of(0.0, 0.0, 0.0, 0.0);
         y = Quaternion.of(0.0, -0.0, 0.0, 0.0);
         Assertions.assertTrue(x.hashCode() != y.hashCode());
-        Assertions.assertFalse(x.equals(y), msg);
+        Assertions.assertNotEquals(x, y, msg);
 
         x = Quaternion.of(0.0, 0.0, 0.0, 0.0);
         y = Quaternion.of(0.0, 0.0, -0.0, 0.0);
         Assertions.assertTrue(x.hashCode() != y.hashCode());
-        Assertions.assertFalse(x.equals(y), msg);
+        Assertions.assertNotEquals(x, y, msg);
 
         x = Quaternion.of(0.0, 0.0, 0.0, 0.0);
         y = Quaternion.of(0.0, 0.0, 0.0, -0.0);
         Assertions.assertTrue(x.hashCode() != y.hashCode());
-        Assertions.assertFalse(x.equals(y), msg);
+        Assertions.assertNotEquals(x, y, msg);
     }
 
     @Test
@@ -485,7 +485,7 @@ public class QuaternionTest {
         Quaternion expected = Quaternion.of(0.5, -0.5, -0.5, 0.5);
         assertEquals(q, expected, EPS);
 
-        Assertions.assertTrue(q.positivePolarForm() == q);
+        Assertions.assertSame(q.positivePolarForm(), q);
     }
 
     @Test
@@ -494,7 +494,7 @@ public class QuaternionTest {
         Quaternion expected = Quaternion.of(0.5, -0.5, 0.5, -0.5);
         assertEquals(q, expected, EPS);
 
-        Assertions.assertTrue(q.positivePolarForm() == q);
+        Assertions.assertSame(q.positivePolarForm(), q);
     }
 
     @Test
@@ -502,7 +502,7 @@ public class QuaternionTest {
         Quaternion q = Quaternion.of(123, 45, 67, 
89).normalize().positivePolarForm();
 
         Assertions.assertTrue(q.getW() >= 0);
-        Assertions.assertTrue(q.positivePolarForm() == q);
+        Assertions.assertSame(q.positivePolarForm(), q);
     }
 
     @Test
@@ -510,7 +510,7 @@ public class QuaternionTest {
         Quaternion q = Quaternion.of(123, 45, 67, 
89).normalize().negate().positivePolarForm();
 
         Assertions.assertTrue(q.getW() >= 0);
-        Assertions.assertTrue(q.positivePolarForm() == q);
+        Assertions.assertSame(q.positivePolarForm(), q);
     }
 
     @Test
diff --git 
a/commons-numbers-rootfinder/src/test/java/org/apache/commons/numbers/rootfinder/BrentSolverTest.java
 
b/commons-numbers-rootfinder/src/test/java/org/apache/commons/numbers/rootfinder/BrentSolverTest.java
index 84a2e97..8dd5a4f 100644
--- 
a/commons-numbers-rootfinder/src/test/java/org/apache/commons/numbers/rootfinder/BrentSolverTest.java
+++ 
b/commons-numbers-rootfinder/src/test/java/org/apache/commons/numbers/rootfinder/BrentSolverTest.java
@@ -159,7 +159,7 @@ public class BrentSolverTest {
         } catch (IllegalStateException ex) {
             // Expected.
             // Ensure expected error condition.
-            Assertions.assertFalse(ex.getMessage().indexOf("too many calls") 
== -1);
+            Assertions.assertNotEquals(ex.getMessage().indexOf("too many 
calls"), -1);
         }
     }
 
@@ -195,21 +195,21 @@ public class BrentSolverTest {
             Assertions.fail("Expecting bad interval condition");
         } catch (SolverException ex) {
             // Ensure expected error condition.
-            Assertions.assertFalse(ex.getMessage().indexOf(" > ") == -1);
+            Assertions.assertNotEquals(ex.getMessage().indexOf(" > "), -1);
         }
         try {  // No bracketing.
             solver.findRoot(f, 1, 1.5);
             Assertions.fail("Expecting non-bracketing condition");
         } catch (SolverException ex) {
             // Ensure expected error condition.
-            Assertions.assertFalse(ex.getMessage().indexOf("No bracketing") == 
-1);
+            Assertions.assertNotEquals(ex.getMessage().indexOf("No 
bracketing"), -1);
         }
         try {  // No bracketing.
             solver.findRoot(f, 1, 1.2, 1.5);
             Assertions.fail("Expecting non-bracketing condition");
         } catch (SolverException ex) {
             // Ensure expected error condition.
-            Assertions.assertFalse(ex.getMessage().indexOf("No bracketing") == 
-1);
+            Assertions.assertNotEquals(ex.getMessage().indexOf("No 
bracketing"), -1);
         }
     }
 
@@ -226,7 +226,7 @@ public class BrentSolverTest {
             Assertions.fail("an out of range condition was expected");
         } catch (SolverException ex) {
             // Ensure expected error condition.
-            Assertions.assertFalse(ex.getMessage().indexOf("out of range") == 
-1);
+            Assertions.assertNotEquals(ex.getMessage().indexOf("out of 
range"), -1);
         }
     }
 

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