Removes deprecated and not used code

src/main/java/org/assertj/vavr/api/AbstractEitherAssert.java

@@ -23,7 +23,6 @@
 import java.util.Comparator;
 import java.util.function.Consumer;
 
-import static org.assertj.core.util.Preconditions.checkArgument;
 import static org.assertj.vavr.api.EitherShouldBeLeft.shouldBeLeft;
 import static org.assertj.vavr.api.EitherShouldBeRight.shouldBeRight;
 import static org.assertj.vavr.api.EitherShouldContain.*;
@@ -255,10 +254,6 @@ public SELF usingDefaultRightValueComparator() {
         return myself;
     }
 
-    private void checkNotNull(Object expectedValue) {
-        checkArgument(expectedValue != null, "The expected value should not be <null>.");
-    }
-
     private void assertIsRight() {
         isNotNull();
         if (actual.isLeft()) throwAssertionError(shouldBeRight(actual));

src/main/java/org/assertj/vavr/api/AbstractMapAssert.java

@@ -26,6 +26,7 @@
 import java.util.function.BiConsumer;
 import java.util.stream.StreamSupport;
 
+import static java.util.Objects.requireNonNull;
 import static org.assertj.core.error.ShouldBeEmpty.shouldBeEmpty;
 import static org.assertj.core.error.ShouldBeNullOrEmpty.shouldBeNullOrEmpty;
 import static org.assertj.core.error.ShouldHaveSameSizeAs.shouldHaveSameSizeAs;
@@ -38,7 +39,6 @@
 import static org.assertj.core.error.ShouldNotBeEmpty.shouldNotBeEmpty;
 import static org.assertj.core.util.Arrays.array;
 import static org.assertj.core.util.IterableUtil.sizeOf;
-import static org.assertj.core.util.Preconditions.checkNotNull;
 
 /**
  * Assertions for {@link Map}.
@@ -68,7 +68,7 @@ abstract class AbstractMapAssert<SELF extends AbstractMapAssert<SELF, ACTUAL, KE
      * @throws AssertionError       if one or more entries don't satisfy the given requirements.
      */
     public SELF allSatisfy(BiConsumer<? super KEY, ? super VALUE> entryRequirements) {
-        checkNotNull(entryRequirements, "The BiConsumer<K, V> expressing the assertions requirements must not be null");
+        requireNonNull(entryRequirements, "The BiConsumer<K, V> expressing the assertions requirements must not be null");
         isNotNull();
         actual.forEach(entry -> entryRequirements.accept(entry._1, entry._2));
         return myself;
@@ -405,7 +405,7 @@ public SELF hasSizeBetween(int lowerBoundary, int higherBoundary) {
     @Override
     public SELF hasSameSizeAs(Iterable<?> other) {
         isNotNull();
-        checkNotNull(other, "The other Iterable to compare actual size with should not be null");
+        requireNonNull(other, "The other Iterable to compare actual size with should not be null");
         final long expectedSize = sizeOf(other);
         if (actual.size() != expectedSize)
             throwAssertionError(shouldHaveSameSizeAs(actual, other, actual.size(), expectedSize));

src/main/java/org/assertj/vavr/api/AbstractMultimapAssert.java

@@ -26,6 +26,7 @@
 import java.util.function.BiConsumer;
 import java.util.stream.StreamSupport;
 
+import static java.util.Objects.requireNonNull;
 import static org.assertj.core.error.ShouldBeEmpty.shouldBeEmpty;
 import static org.assertj.core.error.ShouldBeNullOrEmpty.shouldBeNullOrEmpty;
 import static org.assertj.core.error.ShouldHaveSameSizeAs.shouldHaveSameSizeAs;
@@ -38,7 +39,6 @@
 import static org.assertj.core.error.ShouldNotBeEmpty.shouldNotBeEmpty;
 import static org.assertj.core.util.Arrays.array;
 import static org.assertj.core.util.IterableUtil.sizeOf;
-import static org.assertj.core.util.Preconditions.checkNotNull;
 
 abstract class AbstractMultimapAssert<SELF extends AbstractMultimapAssert<SELF, ACTUAL, KEY, VALUE>, ACTUAL extends Multimap<KEY, VALUE>, KEY, VALUE>
         extends AbstractValueAssert<SELF, ACTUAL> implements EnumerableAssert<SELF, Tuple2<? extends KEY, ? extends VALUE>> {
@@ -138,7 +138,7 @@ public SELF containsExactly(@SuppressWarnings("unchecked") Tuple2<? extends KEY,
      * @throws AssertionError       if one or more entries don't satisfy the given requirements.
      */
     public SELF allSatisfy(BiConsumer<? super KEY, ? super VALUE> entryRequirements) {
-        checkNotNull(entryRequirements, "The BiConsumer<K, V> expressing the assertions requirements must not be null");
+        requireNonNull(entryRequirements, "The BiConsumer<K, V> expressing the assertions requirements must not be null");
         isNotNull();
         actual.forEach(entry -> entryRequirements.accept(entry._1, entry._2));
         return myself;
@@ -399,7 +399,7 @@ public SELF hasSizeBetween(int lowerBoundary, int higherBoundary) {
     @Override
     public SELF hasSameSizeAs(Iterable<?> other) {
         isNotNull();
-        checkNotNull(other, "The other Iterable to compare actual size with should not be null");
+        requireNonNull(other, "The other Iterable to compare actual size with should not be null");
         final long expectedSize = sizeOf(other);
         if (actual.size() != expectedSize)
             throwAssertionError(shouldHaveSameSizeAs(actual, other, actual.size(), expectedSize));

src/main/java/org/assertj/vavr/api/AbstractSeqAssert.java

@@ -26,11 +26,11 @@
 import java.util.function.Consumer;
 
 import static java.lang.String.format;
+import static java.util.Objects.requireNonNull;
 import static org.assertj.core.error.ShouldBeSorted.shouldHaveComparableElementsAccordingToGivenComparator;
 import static org.assertj.core.error.ShouldContainAtIndex.shouldContainAtIndex;
 import static org.assertj.core.error.ShouldNotBeEmpty.shouldNotBeEmpty;
 import static org.assertj.core.error.ShouldNotContainAtIndex.shouldNotContainAtIndex;
-import static org.assertj.core.util.Preconditions.checkNotNull;
 import static org.assertj.vavr.api.SeqShouldBeAtIndex.shouldBeAtIndex;
 import static org.assertj.vavr.api.SeqShouldBeSorted.*;
 import static org.assertj.vavr.api.SeqShouldHaveAtIndex.shouldHaveAtIndex;
@@ -292,18 +292,18 @@ public SELF isSortedAccordingTo(Comparator<? super ELEMENT> comparator) {
      */
     public SELF satisfies(Consumer<? super ELEMENT> requirements, Index index) {
         isNotNull();
-        checkNotNull(requirements, "The Consumer expressing the assertions requirements must not be null");
+        requireNonNull(requirements, "The Consumer expressing the assertions requirements must not be null");
         assertIndexIsValid(index);
         requirements.accept(actual.get(index.value));
         return myself;
     }
 
     private void assertIsSortedAccordingToComparator(Comparator<?> comparator) {
-        checkNotNull(comparator, "The given comparator should not be null");
+        requireNonNull(comparator, "The given comparator should not be null");
         try {
             // Empty collections are considered sorted even if comparator can't be applied to their element type
             // We can't verify that point because of erasure type at runtime.
-            if (actual.size() == 0) return;
+            if (actual.isEmpty()) return;
             Comparator rawComparator = comparator;
             if (actual.size() == 1) {
                 // Compare unique element with itself to verify that it is compatible with comparator (a ClassCastException is
@@ -320,12 +320,11 @@ private void assertIsSortedAccordingToComparator(Comparator<?> comparator) {
             throwAssertionError(
                     shouldHaveComparableElementsAccordingToGivenComparator(actual, comparator));
         }
-        return;
     }
 
     private void assertConditionIsMetAtIndex(Condition<? super ELEMENT> condition, Index index, Runnable errorProvider) {
         isNotNull();
-        checkNotNull(condition, "The condition to evaluate should not be null");
+        requireNonNull(condition, "The condition to evaluate should not be null");
 
         assertNotEmpty();
         assertIndexIsValid(index);
@@ -336,7 +335,7 @@ private void assertConditionIsMetAtIndex(Condition<? super ELEMENT> condition, I
     }
 
     private void assertIndexIsValid(Index index) {
-        checkNotNull(index, "Index should not be null");
+        requireNonNull(index, "Index should not be null");
         final int maximum = actual.size() - 1;
         if (index.value > maximum) {
             String errorMessage = "Index should be between <0> and <%d> (inclusive) but was:%n <%d>";