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ImmutableExpressionResolverTest.java
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ImmutableExpressionResolverTest.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.placeholders;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
import java.util.Collections;
import java.util.Map;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import org.mutabilitydetector.unittesting.AllowedReason;
import org.mutabilitydetector.unittesting.MutabilityAssert;
import org.mutabilitydetector.unittesting.MutabilityMatchers;
import nl.jqno.equalsverifier.EqualsVerifier;
/**
* Tests {@link ImmutableExpressionResolver}.
*/
public class ImmutableExpressionResolverTest {
private static final Map<String, String> KNOWN_HEADERS =
DittoHeaders.newBuilder().putHeader("one", "1").putHeader("two", "2").build();
private static final String UNKNOWN_HEADER_EXPRESSION = "{{ header:missing }}";
private static final String UNKNOWN_THING_EXPRESSION = "{{ thing:missing }}";
private static final String UNKNOWN_TOPIC_EXPRESSION = "{{ topic:missing }}";
private static ImmutableExpressionResolver underTest;
@Test
@Ignore("https://github.com/MutabilityDetector/MutabilityDetector/issues/185")
public void assertImmutability() {
MutabilityAssert.assertInstancesOf(ImmutableExpressionResolver.class, MutabilityMatchers.areImmutable(),
AllowedReason.assumingFields("placeholderResolvers", "placeholderResolverFunctions")
.areSafelyCopiedUnmodifiableCollectionsWithImmutableElements()
);
}
@Test
public void testHashCodeAndEquals() {
EqualsVerifier.forClass(ImmutableExpressionResolver.class)
.usingGetClass()
.verify();
}
@BeforeClass
public static void setupClass() {
final ImmutablePlaceholderResolver<Map<String, String>> headersResolver =
new ImmutablePlaceholderResolver<>(PlaceholderFactory.newHeadersPlaceholder(), KNOWN_HEADERS);
underTest = new ImmutableExpressionResolver(Collections.singletonList(headersResolver));
}
@Test
public void testSuccessfulPlaceholderResolution() {
assertThat(underTest.resolve("{{ header:one }}")).contains(KNOWN_HEADERS.get("one"));
assertThat(underTest.resolve("{{ header:two }}")).contains(KNOWN_HEADERS.get("two"));
}
@Test
public void testPlaceholderResolutionAllowingUnresolvedPlaceholders() {
// supported unresolved placeholders are retained
assertThat(underTest.resolve(UNKNOWN_HEADER_EXPRESSION))
.isEqualTo(PipelineElement.unresolved());
// unsupported placeholders cause error
assertThatExceptionOfType(UnresolvedPlaceholderException.class)
.isThrownBy(() -> underTest.resolve(UNKNOWN_THING_EXPRESSION));
assertThatExceptionOfType(UnresolvedPlaceholderException.class)
.isThrownBy(() -> underTest.resolve(UNKNOWN_TOPIC_EXPRESSION));
}
@Test
public void testUnsuccessfulPlaceholderResolution() {
assertThat(underTest.resolve(UNKNOWN_HEADER_EXPRESSION)).isEmpty();
}
@Test
public void testSuccessfulFunctionBasedOnPlaceholderInput() {
assertThat(underTest.resolve("{{ header:unknown | fn:default('fallback') }}"))
.contains("fallback");
assertThat(underTest.resolve("{{ header:unknown | fn:default('bar') | fn:upper() }}"))
.contains("BAR");
assertThat(underTest.resolve("{{ header:unknown | fn:default(' fallback-spaces ') }}"))
.contains(" fallback-spaces ");
// verify different whitespace
assertThat(underTest.resolve("{{header:unknown |fn:default('bar')| fn:upper() }}"))
.contains("BAR");
assertThat(underTest.resolve("{{ header:unknown | fn:default('bar') |fn:upper()}}"))
.contains("BAR");
assertThat(underTest.resolve("{{ header:unknown | fn:default( 'bar' ) |fn:upper( ) }}"))
.contains("BAR");
}
@Test
public void testSpecialCharactersInStrings() {
assertThat(underTest.resolve("{{ header:unknown | fn:default( ' \\s%!@/*+\"\\'上手カキクケコ' ) | fn:upper( ) }}"))
.contains(" \\S%!@/*+\"\\'上手カキクケコ");
assertThat(underTest.resolve("{{ header:unknown | fn:default( \" \\s%!@/*+'\\\"上手カキクケコ\" ) | fn:upper( ) }}"))
.contains(" \\S%!@/*+'\\\"上手カキクケコ");
}
@Test
public void rejectUnsupportedPlaceholdersWithSpecialCharacters() {
assertThatExceptionOfType(UnresolvedPlaceholderException.class)
.isThrownBy(() -> underTest.resolve("{{ thing:id\\s%!@/*+上手カキクケコ }}"));
}
@Test
public void testUnsuccessfulFunctionBasedOnPlaceholderInput() {
assertThat(underTest.resolve("{{ header:unknown }}")).isEmpty();
assertThat(underTest.resolve("{{ header:unknown | fn:default(header:unknown) }}")).isEmpty();
}
@Test
public void testSuccessfulSinglePlaceholderResolution() {
assertThat(underTest.resolveAsPipelineElement("header:one")).contains(KNOWN_HEADERS.get("one"));
}
@Test
public void testUnsuccessfulSinglePlaceholderResolution() {
assertThat(underTest.resolveAsPipelineElement("header:unknown"))
.isEmpty();
assertThat(underTest.resolveAsPipelineElement("fn:substring-before('')"))
.isEmpty();
}
@Test
public void testResolveBarelyTooComplexFunctionChainWorks() {
// 10 functions should work:
assertThat(underTest.resolve(
"{{ header:unknown | fn:default('fallback') | fn:upper() | fn:lower() | fn:upper()" +
" | fn:lower() | fn:upper() | fn:lower() | fn:upper() | fn:lower() | fn:upper() }}"))
.contains("FALLBACK");
}
@Test
public void testResolveTooComplexFunctionChainResultsInException() {
// 11 functions should fail:
assertThatExceptionOfType(PlaceholderFunctionTooComplexException.class).isThrownBy(() ->
underTest.resolve(
"{{ header:unknown | fn:default('fallback') | fn:upper() | fn:lower()" +
" | fn:upper() | fn:lower() | fn:upper() | fn:lower() | fn:upper() | fn:lower()" +
" | fn:upper() | fn:lower() }}"
));
}
}