Bump assertj-core from 3.19.0 to 3.20.0 (#75)

* Bump assertj-core from 3.19.0 to 3.20.0

Bumps [assertj-core](https://github.com/assertj/assertj-core) from 3.19.0 to 3.20.0.
- [Release notes](https://github.com/assertj/assertj-core/releases)
- [Commits](assertj-core-3.19.0...assertj-core-3.20.0)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Fix expected error messages

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Stefano Cordio <stefano.cordio@gmail.com>

pom.xml

@@ -29,7 +29,7 @@
   <properties>
     <javadocAdditionalOptions>-html5 --allow-script-in-comments --no-module-directories</javadocAdditionalOptions>
     <guava.version>30.1.1-jre</guava.version>
-    <assertj-core.version>3.19.0</assertj-core.version>
+    <assertj-core.version>3.20.0</assertj-core.version>
   </properties>
 
   <dependencies>

src/test/java/org/assertj/guava/api/ByteSourceAssert_hasSameContentAs_Test.java

@@ -61,6 +61,7 @@ public void should_fail_if_content_of_actual_is_not_equal_to_expected_content()
     Throwable throwable = catchThrowable(() -> assertThat(actual).hasSameContentAs(other));
     // THEN
     assertThat(throwable).hasMessage(format("%nexpected: ByteSource.wrap(01)%n" +
-                                            "but was : ByteSource.wrap(00)"));
+                                            " but was: ByteSource.wrap(00)"));
   }
+
 }

src/test/java/org/assertj/guava/api/OptionalAssert_extractingCharSequence_Test.java

@@ -12,9 +12,9 @@
  */
 package org.assertj.guava.api;
 
-import static java.lang.String.format;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.catchThrowable;
+import static org.assertj.core.error.ShouldBeInstance.shouldBeInstance;
 import static org.assertj.core.util.FailureMessages.actualIsNull;
 import static org.assertj.guava.api.Assertions.assertThat;
 
@@ -62,12 +62,7 @@ public void should_not_pass_when_actual_contains_other_than_charSequence() {
     Throwable throwable = catchThrowable(() -> assertThat(actual).extractingCharSequence());
     // THEN
     assertThat(throwable).isInstanceOf(AssertionError.class)
-                         .hasMessage(format("%n" +
-                                            "Expecting:%n" +
-                                            "  12L%n" +
-                                            "to be an instance of:%n" +
-                                            "  java.lang.CharSequence%n" +
-                                            "but was instance of:%n" +
-                                            "  java.lang.Long"));
+                         .hasMessage(shouldBeInstance(12L, CharSequence.class).create());
   }
+
 }