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JUnitAssertThrowsToAssertExceptionType.java
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JUnitAssertThrowsToAssertExceptionType.java
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/*
* Copyright 2021 the original author or authors.
* <p>
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* <p>
* https://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.openrewrite.java.testing.assertj;
import org.openrewrite.ExecutionContext;
import org.openrewrite.Preconditions;
import org.openrewrite.Recipe;
import org.openrewrite.TreeVisitor;
import org.openrewrite.java.JavaIsoVisitor;
import org.openrewrite.java.JavaParser;
import org.openrewrite.java.JavaTemplate;
import org.openrewrite.java.MethodMatcher;
import org.openrewrite.java.search.UsesMethod;
import org.openrewrite.java.tree.J;
import org.openrewrite.java.tree.JavaType;
public class JUnitAssertThrowsToAssertExceptionType extends Recipe {
@Override
public String getDisplayName() {
return "JUnit AssertThrows to AssertJ exceptionType";
}
@Override
public String getDescription() {
return "Convert `JUnit#AssertThrows` to `AssertJ#assertThatExceptionOfType` to allow for chained assertions on the thrown exception.";
}
@Override
public TreeVisitor<?, ExecutionContext> getVisitor() {
return Preconditions.check(new UsesMethod<>("org.junit.jupiter.api.Assertions assertThrows(..)"), new AssertExceptionTypeVisitor());
}
private static class AssertExceptionTypeVisitor extends JavaIsoVisitor<ExecutionContext> {
private JavaParser.Builder<?, ?> assertionsParser;
private JavaParser.Builder<?, ?> assertionsParser(ExecutionContext ctx) {
if (assertionsParser == null) {
assertionsParser = JavaParser.fromJavaVersion()
.classpathFromResources(ctx, "assertj-core-3.24");
}
return assertionsParser;
}
private static final MethodMatcher ASSERT_THROWS_MATCHER = new MethodMatcher("org.junit.jupiter.api.Assertions assertThrows(..)");
private static final JavaType THROWING_CALLABLE_TYPE = JavaType.buildType("org.assertj.core.api.ThrowableAssert.ThrowingCallable");
@Override
public J.MethodInvocation visitMethodInvocation(J.MethodInvocation method, ExecutionContext ctx) {
J.MethodInvocation mi = super.visitMethodInvocation(method, ctx);
if (ASSERT_THROWS_MATCHER.matches(mi)
&& mi.getArguments().size() == 2
&& getCursor().getParentTreeCursor().getValue() instanceof J.Block) {
J executable = mi.getArguments().get(1);
if (executable instanceof J.Lambda) {
executable = ((J.Lambda) executable).withType(THROWING_CALLABLE_TYPE);
} else if (executable instanceof J.MemberReference) {
executable = ((J.MemberReference) executable).withType(THROWING_CALLABLE_TYPE);
} else {
executable = null;
}
if (executable != null) {
mi = JavaTemplate
.builder("assertThatExceptionOfType(#{any(java.lang.Class)}).isThrownBy(#{any(org.assertj.core.api.ThrowableAssert.ThrowingCallable)})")
.javaParser(assertionsParser(ctx))
.staticImports("org.assertj.core.api.AssertionsForClassTypes.assertThatExceptionOfType")
.build()
.apply(
getCursor(),
mi.getCoordinates().replace(),
mi.getArguments().get(0), executable
);
maybeAddImport("org.assertj.core.api.AssertionsForClassTypes", "assertThatExceptionOfType");
maybeRemoveImport("org.junit.jupiter.api.Assertions.assertThrows");
maybeRemoveImport("org.junit.jupiter.api.Assertions");
}
}
return mi;
}
}
}