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

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

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...18import org.assertj.core.test.TestData;19import org.assertj.core.util.FailureMessages;20import org.junit.jupiter.api.Test;21/​**22 * Tests for <code>{@link Strings#assertContainsOnlyOnce(AssertionInfo, CharSequence, CharSequence)}</​code>.23 */​24public class Strings_assertContainsOnlyOnce_Test extends StringsBaseTest {25 @Test26 public void should_pass_if_actual_contains_given_string_only_once() {27 strings.assertContainsOnlyOnce(TestData.someInfo(), "Yoda", "Yo");28 }29 @Test30 public void should_fail_if_actual_contains_given_string_more_than_once() {31 Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> strings.assertContainsOnlyOnce(someInfo(), "Yodayoda", "oda")).withMessage(ShouldContainCharSequenceOnlyOnce.shouldContainOnlyOnce("Yodayoda", "oda", 2).create());32 }33 @Test34 public void should_fail_if_actual_contains_sequence_only_once_but_in_different_case() {35 Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> strings.assertContainsOnlyOnce(someInfo(), "Yoda", "yo")).withMessage(ShouldContainCharSequenceOnlyOnce.shouldContainOnlyOnce("Yoda", "yo", 0).create());36 }37 @Test38 public void should_fail_if_actual_does_not_contain_given_string() {39 Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> strings.assertContainsOnlyOnce(someInfo(), "Yoda", "Luke")).withMessage(ShouldContainCharSequenceOnlyOnce.shouldContainOnlyOnce("Yoda", "Luke", 0).create());40 }41 @Test42 public void should_throw_error_if_sequence_is_null() {43 Assertions.assertThatNullPointerException().isThrownBy(() -> strings.assertContainsOnlyOnce(someInfo(), "Yoda", null)).withMessage(ErrorMessages.charSequenceToLookForIsNull());44 }45 @Test46 public void should_fail_if_actual_is_null() {47 Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> strings.assertContainsOnlyOnce(someInfo(), null, "Yoda")).withMessage(FailureMessages.actualIsNull());48 }49 @Test50 public void should_pass_if_actual_contains_sequence_only_once_according_to_custom_comparison_strategy() {51 stringsWithCaseInsensitiveComparisonStrategy.assertContainsOnlyOnce(TestData.someInfo(), "Yoda", "Yo");52 stringsWithCaseInsensitiveComparisonStrategy.assertContainsOnlyOnce(TestData.someInfo(), "Yoda", "yo");53 stringsWithCaseInsensitiveComparisonStrategy.assertContainsOnlyOnce(TestData.someInfo(), "Yoda", "YO");54 }55 @Test56 public void should_fail_if_actual_does_not_contain_sequence_only_once_according_to_custom_comparison_strategy() {57 Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> stringsWithCaseInsensitiveComparisonStrategy.assertContainsOnlyOnce(someInfo(), "Yoda", "Luke")).withMessage(ShouldContainCharSequenceOnlyOnce.shouldContainOnlyOnce("Yoda", "Luke", 0, comparisonStrategy).create());58 }59 @Test60 public void should_fail_if_actual_contains_sequence_several_times_according_to_custom_comparison_strategy() {61 Assertions.assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> stringsWithCaseInsensitiveComparisonStrategy.assertContainsOnlyOnce(someInfo(), "Yoda", "Luke")).withMessage(ShouldContainCharSequenceOnlyOnce.shouldContainOnlyOnce("Yoda", "Luke", 0, comparisonStrategy).create());62 }63}...

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assertContainsOnlyOnce

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1import static org.assertj.core.api.Assertions.assertThat;2import static org.assertj.core.internal.Strings.assertContainsOnlyOnce;3import static org.assertj.core.test.TestData.someInfo;4import org.assertj.core.api.AssertionInfo;5import org.assertj.core.internal.Strings;6import org.junit.Test;7public class Strings_assertContainsOnlyOnce_Test {8 private Strings strings = Strings.instance();9 public void should_pass_if_actual_contains_given_values_only_once() {10 AssertionInfo info = someInfo();11 String actual = "Yoda";12 String[] values = { "Yo", "da" };13 assertContainsOnlyOnce(info, actual, values);14 }15 public void should_fail_if_actual_contains_given_values_more_than_once() {16 thrown.expect(AssertionError.class);17 AssertionInfo info = someInfo();18 String actual = "Yoda";19 String[] values = { "Yo", "da", "Yo" };20 assertContainsOnlyOnce(info, actual, values);21 }22 public void should_fail_if_actual_does_not_contain_given_values() {23 thrown.expect(AssertionError.class);24 AssertionInfo info = someInfo();25 String actual = "Yoda";26 String[] values = { "Luke", "Leia" };27 assertContainsOnlyOnce(info, actual, values);28 }29 public void should_fail_if_actual_is_null() {30 thrown.expect(AssertionError.class);31 assertContainsOnlyOnce(someInfo(), null, arrayOf("Yoda"));32 }33 public void should_fail_if_actual_is_empty() {34 thrown.expect(AssertionError.class);35 assertContainsOnlyOnce(someInfo(), "", arrayOf("Yoda"));36 }37 public void should_throw_error_if_given_values_is_null() {38 thrown.expect(NullPointerException.class);39 assertContainsOnlyOnce(someInfo(), "Yoda", null);40 }41 public void should_throw_error_if_given_values_is_empty() {42 thrown.expect(IllegalArgumentException.class);43 assertContainsOnlyOnce(someInfo(), "Yoda", emptyArray());44 }45}46We use the static import to be able to use the assertContainsOnly

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assertContainsOnlyOnce

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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.internal.ErrorMessages.*;4import static org.assertj.core.test.TestData.someInfo;5import static org.assertj.core.util.FailureMessages.actualIsNull;6import static org.assertj.core.util.Sets.newLinkedHashSet;7import static org.assertj.core.util.Sets.newTreeSet;8import static org.assertj.core.util.Sets.newHashSet;9import static org.assertj.core.api.Assertions.*;10import org.junit.Test;11import java.util.*;12import org.assertj.core.api.*;13import org.assertj.core.api.Assertions.*;14import org.assertj.core.internal.*;15import org.assertj.core.internal.Strings;16import org.assertj.core.util.*;17import org.junit.*;18import static org.assertj.core.api.Assertions.assertThat;19import static org.assertj.core.api.Assertions.assertThatExceptionOfType;20import static org.assertj.core.internal.ErrorMessages.*;21import static org.assertj.core.test.TestData.someInfo;22import static org.assertj.core.util.FailureMessages.actualIsNull;23import static org.assertj.core.util.Sets.newLinkedHashSet;24import static org.assertj.core.util.Sets.newTreeSet;25import static org.assertj.core.util.Sets.newHashSet;26import static org.assertj.core.api.Assertions.*;27import org.junit.Test;28import java.util.*;29import org.assertj.core.api.*;30import org.assertj.core.api.Assertions.*;31import org.assertj.core.internal.*;32import org.assertj.core.internal.Strings;33import org.assertj.core.util.*;34import org.junit.*;35public class AssertJCoreAssertThatTest {36public void assertThatTest1() {37assertThat("abc").contains("b").doesNotContain("d");38}39public void assertThatTest2() {40assertThat(new String[]{"a", "b"}).contains("a", "b").doesNotContain("c");41}42public void assertThatTest3() {43assertThat(new HashSet<String>(Arrays.asList("a", "b"))).contains("a").doesNotContain("c");44}45public void assertThatTest4() {46assertThat(new String[]{"a", "b"}).contains("a", "b").doesNotContain("c");47}48public void assertThatTest5() {49assertThat(new HashSet<String>(Arrays.asList("a", "b"))).contains("a").doesNotContain("c");50}51public void assertThatTest6() {52assertThat("abc").contains("b").doesNotContain("d");53}54public void assertThatTest7() {55assertThat(new

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1import org.assertj.core.api.Assertions;2import org.assertj.core.internal.Strings;3import org.junit.Test;4public class AssertContainsOnlyOnceTest {5 public void test() {6 String s = "My name is John Doe";7 String word = "John";8 Strings strings = new Strings();9 strings.assertContainsOnlyOnce(Assertions.assertThat(s), word);10 }11}

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1 public void testAssertContainsOnlyOnce() {2 String str = "This is a test";3 String substring = "test";4 Assertions.assertThat(str).containsOnlyOnce(substring);5 }6 public void testAssertContainsOnlyOnce() {7 String str = "This is a test";8 String substring = "test";9 Assertions.assertThat(str).containsOnlyOnce(substring);10 }11 public void testAssertContainsOnlyOnce() {12 String str = "This is a test";13 String substring = "test";14 Assertions.assertThat(str).containsOnlyOnce(substring);15 }16 public void testAssertContainsOnlyOnce() {17 String str = "This is a test";18 String substring = "test";19 Assertions.assertThat(str).containsOnlyOnce(substring);20 }21 public void testAssertContainsOnlyOnce() {22 String str = "This is a test";23 String substring = "test";24 Assertions.assertThat(str).containsOnlyOnce(substring);25 }26 public void testAssertContainsOnlyOnce() {27 String str = "This is a test";28 String substring = "test";29 Assertions.assertThat(str).containsOnlyOnce(substring);30 }31 public void testAssertContainsOnlyOnce() {

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1 public void testAssertContainsOnlyOnce() {2 assertThat("Hello World").as("Test String").containsOnlyOnce("Hello");3 }4AssertJ containsOnlyOnce() method5assertThat(string).containsOnlyOnce(substring)6 public void testContainsOnlyOnce() {7 assertThat("Hello World").as("Test String").containsOnlyOnce("Hello");8 }9JUnit containsOnlyOnce() method10assertThat(string, containsOnlyOnce(substring))11 public void testContainsOnlyOnce() {12 assertThat("Hello World", containsOnlyOnce("Hello"));13 }14This is a guide to AssertJ and JUnit containsOnlyOnce() method. Here we discuss the AssertJ containsOnlyOnce() method, JUnit contains

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1 public static void assertContainsOnlyOnce(AssertionInfo info, CharSequence actual, char value) {2 assertNotNull(info, actual);3 if (actual instanceof String) {4 String actualAsString = (String) actual;5 int occurrences = 0;6 for (int i = 0; i < actualAsString.length(); i++) {7 if (actualAsString.charAt(i) == value) {8 occurrences++;9 }10 }11 if (occurrences != 1) {12 throw failures.failure(info, shouldContainOnlyOnce(actual, value, occurrences));13 }14 } else {15 int occurrences = 0;16 for (int i = 0; i < actual.length(); i++) {17 if (actual.charAt(i) == value) {18 occurrences++;19 }20 }21 if (occurrences != 1) {22 throw failures.failure(info, shouldContainOnlyOnce(actual, value, occurrences));23 }24 }25 }26}27public static void assertContainsOnlyOnce(AssertionInfo info, CharSequence actual, char value) {28 assertNotNull(info, actual);29 int occurrences = countOccurrences(actual, value);30 if (occurrences != 1) {31 throw failures.failure(info, shouldContainOnlyOnce(actual, value, occurrences));32 }33 }34 private static int countOccurrences(CharSequence actual, char value) {35 int occurrences = 0;36 for (int i = 0; i < actual.length(); i++) {37 if (actual.charAt(i) == value) {38 occurrences++;39 }40 }41 return occurrences;42 }

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