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io.polaris.core.assertion.Assertions Maven / Gradle / Ivy
package io.polaris.core.assertion;
import io.polaris.core.err.AssertionException;
import io.polaris.core.err.MultipleException;
import io.polaris.core.function.Executable;
import io.polaris.core.lang.Other;
import io.polaris.core.string.Strings;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* @author Qt
* @since 1.8
*/
public class Assertions {
private static final String EXPECTED_TRUE = "expected: but was: ";
private static final String EXPECTED_FALSE = "expected: but was: ";
public static void fail(String message) throws AssertionException {
throw new AssertionException(message);
}
public static void fail(String message, Throwable t) throws AssertionException {
throw new AssertionException(message, t);
}
static String buildPrefix(String message) throws AssertionException {
return (Strings.isNotBlank(message) ? message + " ==> " : "");
}
public static void assertTrue(boolean condition, String message) throws AssertionException {
if (!condition) {
throw new AssertionException(buildPrefix(message) + EXPECTED_TRUE, true, false);
}
}
public static void assertFalse(boolean condition, String message) throws AssertionException {
if (condition) {
throw new AssertionException(buildPrefix(message) + EXPECTED_FALSE, false, true);
}
}
public static void assertNull(Object actual, String message) throws AssertionException {
if (actual != null) {
throw new AssertionException(buildPrefix(message) + "expected: but was: <" + actual + ">", null, actual);
}
}
public static void assertNotNull(Object actual, String message) throws AssertionException {
if (actual == null) {
throw new AssertionException(buildPrefix(message) + "expected: not ", null, actual);
}
}
public static void assertEquals(char expected, char actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertEquals(byte expected, byte actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertEquals(short expected, short actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertEquals(int expected, int actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertEquals(long expected, long actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertEquals(double expected, double actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertEquals(float expected, float actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertEquals(Object expected, Object actual, String message) throws AssertionException {
if (!Objects.equals(expected, actual)) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertSame(Object expected, Object actual, String message) throws AssertionException {
if (expected != actual) {
throw new AssertionException(format(expected, actual, message), expected, actual);
}
}
public static void assertNotEquals(char expected, char actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotEquals(byte expected, byte actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotEquals(short expected, short actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotEquals(int expected, int actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotEquals(long expected, long actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotEquals(double expected, double actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotEquals(float expected, float actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotEquals(Object expected, Object actual, String message) throws AssertionException {
if (Objects.equals(expected, actual)) {
throw new AssertionException(buildPrefix(message) + "expected: not equal but was: <" + actual + ">", Other.of(actual), actual);
}
}
public static void assertNotSame(Object expected, Object actual, String message) throws AssertionException {
if (expected == actual) {
throw new AssertionException(buildPrefix(message) + "expected: not same but was: <" + actual + ">", Other.of(actual), actual);
}
}
static String format(Object expected, Object actual, String message) {
return buildPrefix(message) + formatValues(expected, actual);
}
static String formatValues(Object expected, Object actual) {
String expectedString = toString(expected);
String actualString = toString(actual);
if (expectedString.equals(actualString)) {
return String.format("expected: %s but was: %s", formatClassAndValue(expected, expectedString),
formatClassAndValue(actual, actualString));
}
return String.format("expected: <%s> but was: <%s>", expectedString, actualString);
}
private static String formatClassAndValue(Object value, String valueString) {
// If the value is null, return instead of null.
if (value == null) {
return "";
}
String hash = Integer.toHexString(System.identityHashCode(value));
return (value instanceof Class ?
"<" + ((Class) value).getCanonicalName() + "@" + hash + ">"
: value.getClass().getCanonicalName() + "@" + hash + "<" + valueString + ">");
}
private static String toString(Object obj) {
if (obj == null) {
return "null";
}
if (obj instanceof Class) {
return ((Class) obj).getCanonicalName();
}
if (obj.getClass().isArray()) {
if (obj.getClass().getComponentType().isPrimitive()) {
if (obj instanceof boolean[]) {
return Arrays.toString((boolean[]) obj);
}
if (obj instanceof char[]) {
return Arrays.toString((char[]) obj);
}
if (obj instanceof short[]) {
return Arrays.toString((short[]) obj);
}
if (obj instanceof byte[]) {
return Arrays.toString((byte[]) obj);
}
if (obj instanceof int[]) {
return Arrays.toString((int[]) obj);
}
if (obj instanceof long[]) {
return Arrays.toString((long[]) obj);
}
if (obj instanceof float[]) {
return Arrays.toString((float[]) obj);
}
if (obj instanceof double[]) {
return Arrays.toString((double[]) obj);
}
}
return Arrays.deepToString((Object[]) obj);
}
return String.valueOf(obj);
}
public static void assertAll(String message, Executable... executables) throws MultipleException {
assertAll(message, Arrays.stream(executables));
}
public static void assertAll(String message, Collection executables) throws MultipleException {
assertAll(message, executables.stream());
}
public static void assertAll(String message, Stream executables) throws MultipleException {
List failures = executables.map(executable -> {
try {
executable.execute();
return null;
} catch (Throwable e) {
return e;
}
}).filter(Objects::nonNull)
.collect(Collectors.toList());
if (!failures.isEmpty()) {
MultipleException err = new MultipleException(message, failures);
failures.forEach(err::addSuppressed);
throw err;
}
}
public static T assertThrowsExactly(Class expected, Executable executable, String message) throws AssertionException {
try {
executable.execute();
} catch (Throwable actual) {
if (expected.equals(actual.getClass())) {
return (T) actual;
}
throw new AssertionException(buildPrefix(message)
+ format(expected, actual.getClass(), "Unexpected exception type thrown"), actual);
}
throw new AssertionException(buildPrefix(message)
+ String.format("Expected %s to be thrown, but nothing was thrown.", expected.getCanonicalName()));
}
public static T assertThrows(Class expected, Executable executable, String message) throws AssertionException {
try {
executable.execute();
} catch (Throwable actual) {
if (expected.isInstance(actual)) {
return (T) actual;
}
throw new AssertionException(buildPrefix(message)
+ format(expected, actual.getClass(), "Unexpected exception type thrown"), actual);
}
throw new AssertionException(buildPrefix(message)
+ String.format("Expected %s to be thrown, but nothing was thrown.", expected.getCanonicalName()));
}
public static void assertNotThrowsExactly(Class expected, Executable executable, String message) throws AssertionException {
try {
executable.execute();
} catch (Throwable actual) {
if (expected.equals(actual.getClass())) {
throw new AssertionException(buildPrefix(message)
+ String.format("expected: not <%s> to be thrown, but <%s> was thrown.", expected.getCanonicalName(), actual.getClass().getCanonicalName())
, actual, Other.of(expected), actual);
}
}
}
public static void assertNotThrows(Class expected, Executable executable, String message) throws AssertionException {
try {
executable.execute();
} catch (Throwable actual) {
if (expected.isInstance(actual)) {
throw new AssertionException(buildPrefix(message)
+ String.format("expected: not <%s> to be thrown, but <%s> was thrown.", expected.getCanonicalName(), actual.getClass().getCanonicalName())
, actual, Other.of(expected), actual);
}
}
}
public static void assertSomethingThrows(Executable executable, String message) throws AssertionException {
try {
executable.execute();
throw new AssertionException(buildPrefix(message) + "Expected something to be thrown, but nothing was thrown.", Throwable.class, null);
} catch (Throwable actual) {
}
}
public static void assertNothingThrows(Executable executable, String message) throws AssertionException {
try {
executable.execute();
} catch (Throwable actual) {
throw new AssertionException(buildPrefix(message)
+ String.format("Expected nothing to be thrown, but <%s> was thrown.", actual.getClass().getCanonicalName()), actual, null, actual);
}
}
public static void assertInstanceOf(Class expectedType, Object actualValue, String message) throws AssertionException {
if (!expectedType.isInstance(actualValue)) {
String reason = (actualValue == null ? "Unexpected null value" : "Unexpected type");
throw new AssertionException(buildPrefix(message)
+ format(expectedType, actualValue == null ? null : actualValue.getClass(), reason),
expectedType, actualValue == null ? null : actualValue.getClass());
}
}
public static void assertNotInstanceOf(Class expectedType, Object actualValue, String message) throws AssertionException {
if (expectedType.isInstance(actualValue)) {
throw new AssertionException(buildPrefix(message)
+ format(Other.of(expectedType), actualValue.getClass(), "Unexpected type"),
Other.of(expectedType), actualValue.getClass());
}
}
public static void assertAssignable(Class expectedType, Class actualValue, String message) throws AssertionException {
if (actualValue == null || !expectedType.isAssignableFrom(actualValue)) {
String reason = (actualValue == null ? "Unexpected null value" : "Unexpected type");
throw new AssertionException(buildPrefix(message)
+ format(expectedType, actualValue == null ? null : actualValue, reason),
expectedType, actualValue == null ? null : actualValue);
}
}
public static void assertNotAssignable(Class expectedType, Class actualValue, String message) throws AssertionException {
if (actualValue != null && expectedType.isAssignableFrom(actualValue)) {
throw new AssertionException(buildPrefix(message)
+ format(Other.of(expectedType), actualValue, "Unexpected type"),
Other.of(expectedType), actualValue);
}
}
}
