org.openrewrite.java.tree.SwitchExpressionTest Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of rewrite-java-tck Show documentation
Eliminate tech-debt. Automatically.
The newest version!
/*
 * Copyright 2022 the original author or authors.
 * 
 * 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
 * 

 * https://www.apache.org/licenses/LICENSE-2.0
 * 
 * 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.tree;

import org.junit.jupiter.api.Test;
import org.openrewrite.Issue;
import org.openrewrite.java.JavaIsoVisitor;
import org.openrewrite.java.MinimumJava17;
import org.openrewrite.test.RewriteTest;

import static org.assertj.core.api.Assertions.assertThat;
import static org.openrewrite.java.Assertions.java;

@MinimumJava17
class SwitchExpressionTest implements RewriteTest {

    @Issue("https://github.com/openrewrite/rewrite/issues/2550")
    @Test
    void switchExpressionsReturningEnums() {
        rewriteRun(
          java(
            """
              enum Answer {
                  YES, MAYBE, NO
              }
              """
          ),
          java(
            """
              class Test {
                  private Answer run(String test) {
                      return switch (test) {
                          case "test1" -> Answer.NO;
                          case "test2" -> Answer.YES;
                          default -> Answer.MAYBE;
                      };
                  }
              }
              """
          )
        );
    }

    @Issue("https://github.com/openrewrite/rewrite/issues/2164")
    @Test
    void basicSyntax() {
        rewriteRun(
          java(
            """
              class Test {
                int test(int i) {
                    return switch (i) {
                        case 1 -> 1;
                        case 2 -> 2;
                        default -> 3;
                    };
                }
              }
              """
          )
        );
    }

    @Issue("https://github.com/openrewrite/rewrite/issues/2164")
    @Test
    void multipleExpressions() {
        rewriteRun(
          java(
            """
              class Test {
                int test(int i) {
                    return switch (i) {
                        case 1, 2 -> 1;
                        default -> 3;
                    };
                }
              }
              """
          )
        );
    }

    @Issue("https://github.com/openrewrite/rewrite/issues/2164")
    @Test
    void yieldFromStatement() {
        rewriteRun(
          java(
            """
              class Test {
                int test(int i) {
                    return switch (i) {
                        case 1, 2:
                            yield 1;
                        default:
                            yield 3;
                    };
                }
              }
              """
          )
        );
    }

    @SuppressWarnings("RedundantLabeledSwitchRuleCodeBlock")
    @Issue("https://github.com/openrewrite/rewrite/issues/2164")
    @Test
    void yieldFromRule() {
        rewriteRun(
          java(
            """
              class Test {
                int test(int i) {
                    return switch (i) {
                        case 1, 2 -> { yield 1; }
                        default -> { yield 3; }
                    };
                }
              }
              """
          )
        );
    }

    @Issue("https://github.com/openrewrite/rewrite/issues/2357")
    @Test
    void visitSwitchExpressionAndGetType() {
        rewriteRun(
          spec -> spec.recipe(RewriteTest.toRecipe(JavaIsoVisitor::new)),
          java(
            """
              class Test {
                int test(int i) {
                    return switch (i) {
                        case 1 -> 1;
                        case 2 -> 2;
                        default -> 3;
                    };
                }
              }
              """,
              spec -> spec.afterRecipe(cu -> {
                  J.MethodDeclaration md = (J.MethodDeclaration) cu.getClasses().get(0).getBody().getStatements().get(0);
                  assert md.getBody() != null;

                  J.SwitchExpression s = ((J.SwitchExpression) ((J.Return) md.getBody().getStatements().get(0)).getExpression());
                  assert s != null;

                  JavaType type = s.getType();
                  assertThat(type).isEqualTo(JavaType.Primitive.Int);
              }
            )
          )
        );
    }
}