How to use failIfPrefixIsNull method of org.assertj.core.internal.Strings class

Best Assertj code snippet using org.assertj.core.internal.Strings.failIfPrefixIsNull

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...407 * @throws AssertionError if the given {@code CharSequence} is {@code null}.408 * @throws AssertionError if the actual {@code CharSequence} does not start with the given prefix.409 */​410 public void assertStartsWith(AssertionInfo info, CharSequence actual, CharSequence prefix) {411 failIfPrefixIsNull(prefix);412 assertNotNull(info, actual);413 if (!comparisonStrategy.stringStartsWith(actual.toString(), prefix.toString()))414 throw failures.failure(info, shouldStartWith(actual, prefix, comparisonStrategy));415 }416 /​**417 * Verifies that the given {@code CharSequence} does not start with the given prefix.418 *419 * @param info contains information about the assertion.420 * @param actual the actual {@code CharSequence}.421 * @param prefix the given prefix.422 * @throws NullPointerException if the given sequence is {@code null}.423 * @throws AssertionError if the given {@code CharSequence} is {@code null}.424 * @throws AssertionError if the actual {@code CharSequence} starts with the given prefix.425 * @author Michal Kordas426 */​427 public void assertDoesNotStartWith(AssertionInfo info, CharSequence actual, CharSequence prefix) {428 failIfPrefixIsNull(prefix);429 assertNotNull(info, actual);430 if (comparisonStrategy.stringStartsWith(actual.toString(), prefix.toString()))431 throw failures.failure(info, shouldNotStartWith(actual, prefix, comparisonStrategy));432 }433 private static void failIfPrefixIsNull(CharSequence prefix) {434 checkNotNull(prefix, "The given prefix should not be null");435 }436 /​**437 * Verifies that the given {@code CharSequence} ends with the given suffix.438 * 439 * @param info contains information about the assertion.440 * @param actual the actual {@code CharSequence}.441 * @param suffix the given suffix.442 * @throws NullPointerException if the given sequence is {@code null}.443 * @throws AssertionError if the given {@code CharSequence} is {@code null}.444 * @throws AssertionError if the actual {@code CharSequence} does not end with the given suffix.445 */​446 public void assertEndsWith(AssertionInfo info, CharSequence actual, CharSequence suffix) {447 failIfSuffixIsNull(suffix);...

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failIfPrefixIsNull

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1import org.assertj.core.api.AbstractAssert;2import org.assertj.core.api.AbstractCharSequenceAssert;3import org.assertj.core.api.Assertions;4import org.assertj.core.api.ObjectAssert;5import org.assertj.core.internal.Strings;6import org.assertj.core.util.VisibleForTesting;7import java.util.List;8import java.util.Map;9import static org.assertj.core.error.ShouldStartWith.shouldStartWith;10public class AssertJCustomAssertion extends AbstractAssert<AssertJCustomAssertion, String> {11 Strings strings = Strings.instance();12 protected AssertJCustomAssertion(String actual) {13 super(actual, AssertJCustomAssertion.class);14 }15 public static AssertJCustomAssertion assertThat(String actual) {16 return new AssertJCustomAssertion(actual);17 }18 public AssertJCustomAssertion startsWith(String prefix) {19 strings.failIfPrefixIsNull(prefix);20 if (!actual.startsWith(prefix)) {21 throwAssertionError(shouldStartWith(actual, prefix));22 }23 return this;24 }25 public AssertJCustomAssertion startsWithIgnoringCase(String prefix) {26 strings.failIfPrefixIsNull(prefix);27 if (!actual.toLowerCase().startsWith(prefix.toLowerCase())) {28 throwAssertionError(shouldStartWith(actual, prefix));29 }30 return this;31 }32 public AssertJCustomAssertion contains(String sequence) {33 strings.failIfSequenceIsNull(sequence);34 if (!actual.contains(sequence)) {35 throwAssertionError(shouldStartWith(actual, sequence));36 }37 return this;38 }39 public AssertJCustomAssertion containsIgnoringCase(String sequence) {40 strings.failIfSequenceIsNull(sequence);41 if (!actual.toLowerCase().contains(sequence.toLowerCase())) {42 throwAssertionError(shouldStartWith(actual, sequence));43 }44 return this;45 }46 public AssertJCustomAssertion doesNotContain(String sequence) {47 strings.failIfSequenceIsNull(sequence);48 if (actual.contains(sequence)) {49 throwAssertionError(shouldStartWith(actual, sequence));50 }51 return this;52 }53 public AssertJCustomAssertion doesNotContainIgnoringCase(String sequence) {54 strings.failIfSequenceIsNull(sequence);55 if (actual.toLowerCase().contains(sequence.toLowerCase())) {56 throwAssertionError(shouldStartWith(actual, sequence));57 }58 return this;59 }60 public AssertJCustomAssertion doesNotContainWhitespace() {61 strings.failIfSequenceIsNull(" ");62 if (actual.contains(" ")) {

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failIfPrefixIsNull

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1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.api.Assertions.assertThatExceptionOfType;3import static org.assertj.core.api.Assertions.catchThrowable;4import static org.assertj.core.error.ShouldNotStartWith.shouldNotStartWith;5import static org.assertj.core.test.TestData.someInfo;6import static org.assertj.core.util.FailureMessages.actualIsNull;7import org.assertj.core.internal.Strings;8import org.assertj.core.internal.StringsBaseTest;9import org.junit.jupiter.api.DisplayName;10import org.junit.jupiter.api.Test;11class Strings_assertDoesNotStartWith_Test extends StringsBaseTest {12 @DisplayName("should throw an error if the given prefix is null")13 void should_throw_error_if_prefix_is_null() {14 String prefix = null;15 Throwable throwable = catchThrowable(() -> strings.assertDoesNotStartWith(someInfo(), "Yoda", prefix));16 assertThat(throwable).isInstanceOf(NullPointerException.class);17 }18 @DisplayName("should throw an error if the given string is null")19 void should_throw_error_if_actual_is_null() {20 String actual = null;21 Throwable throwable = catchThrowable(() -> strings.assertDoesNotStartWith(someInfo(), actual, "Yoda"));22 assertThat(throwable).isInstanceOf(AssertionError.class);23 assertThat(throwable).hasMessage(actualIsNull());24 }25 @DisplayName("should fail if actual starts with prefix")26 void should_fail_if_actual_starts_with_prefix() {27 String actual = "Yoda";28 String prefix = "Yo";29 AssertionError assertionError = assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> strings.assertDoesNotStartWith(someInfo(), actual, prefix));30 assertThat(assertionError).hasMessage(shouldNotStartWith(actual, prefix).create());31 }32 @DisplayName("should pass if actual does not start with prefix")33 void should_pass_if_actual_does_not_start_with_prefix() {34 String actual = "Yoda";35 String prefix = "Lu";

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1public class AssertjCore {2 public static void main(String[] args) {3 Strings strings = new Strings();4 strings.failIfPrefixIsNull("prefix", "prefix is null");5 }6}7 at org.assertj.core.internal.Strings.failIfPrefixIsNull(Strings.java:50)8 at AssertjCore.main(AssertjCore.java:17)

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