Test status quo for relative paths & placeholders in @TestPropertySource

This commit introduces a collection of @Nested integration tests that
verify proper support for @TestPropertySource with explicit properties
files declared with absolute paths, relative paths, and placeholders in
the classpath and in the file system.

See gh-23544

spring-test/src/test/java/org/springframework/test/context/env/AbstractExplicitPropertiesFileTests.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2002-2019 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.springframework.test.context.env;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.Environment;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * @author Sam Brannen
+ * @since 5.2
+ */
+@SpringJUnitConfig
+abstract class AbstractExplicitPropertiesFileTests {
+
+	@Autowired
+	Environment env;
+
+
+	@Test
+	@DisplayName("verify properties are available in the Environment")
+	void verifyPropertiesAreAvailableInEnvironment() {
+		String userHomeKey = "user.home";
+		assertThat(env.getProperty(userHomeKey)).isEqualTo(System.getProperty(userHomeKey));
+		assertThat(env.getProperty("explicit")).isEqualTo("enigma");
+	}
+
+
+	@Configuration
+	static class Config {
+		/* no user beans required for these tests */
+	}
+
+}

spring-test/src/test/java/org/springframework/test/context/env/ExplicitPropertiesFileInClasspathTestPropertySourceTests.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2002-2019 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.springframework.test.context.env;
+
+import org.springframework.test.context.TestPropertySource;
+
+/**
+ * Integration tests for {@link TestPropertySource @TestPropertySource}
+ * support with an explicitly named properties file in the classpath.
+ *
+ * @author Sam Brannen
+ * @since 4.1
+ */
+@TestPropertySource("explicit.properties")
+public class ExplicitPropertiesFileInClasspathTestPropertySourceTests extends AbstractExplicitPropertiesFileTests {
+}

spring-test/src/test/java/org/springframework/test/context/env/ExplicitPropertiesFileTestPropertySourceTests.java

@@ -16,45 +16,131 @@
 
 package org.springframework.test.context.env;
 
-import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
 
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.context.annotation.Configuration;
-import org.springframework.core.env.Environment;
-import org.springframework.test.context.ContextConfiguration;
 import org.springframework.test.context.TestPropertySource;
-import org.springframework.test.context.junit.jupiter.SpringExtension;
-
-import static org.assertj.core.api.Assertions.assertThat;
+import org.springframework.util.ClassUtils;
 
 /**
- * Integration tests for {@link TestPropertySource @TestPropertySource}
- * support with an explicitly named properties file.
+ * Collection of integration tests that verify proper support for
+ * {@link TestPropertySource @TestPropertySource} with explicit properties
+ * files declared with absolute paths, relative paths, and placeholders in the
+ * classpath and in the file system.
  *
  * @author Sam Brannen
- * @since 4.1
+ * @since 5.2
  */
-@ExtendWith(SpringExtension.class)
-@ContextConfiguration
-@TestPropertySource("explicit.properties")
-public class ExplicitPropertiesFileTestPropertySourceTests {
+@DisplayName("Explicit properties file in @TestPropertySource")
+class ExplicitPropertiesFileTestPropertySourceTests {
 
-	@Autowired
-	protected Environment env;
+	static final String CURRENT_TEST_PACKAGE = "current.test.package";
 
 
-	@Test
-	void verifyPropertiesAreAvailableInEnvironment() {
-		String userHomeKey = "user.home";
-		assertThat(env.getProperty(userHomeKey)).isEqualTo(System.getProperty(userHomeKey));
-		assertThat(env.getProperty("explicit")).isEqualTo("enigma");
+	@BeforeAll
+	static void setSystemProperty() {
+		String path = ClassUtils.classPackageAsResourcePath(ExplicitPropertiesFileTestPropertySourceTests.class);
+		System.setProperty(CURRENT_TEST_PACKAGE, path);
+	}
+
+	@AfterAll
+	static void clearSystemProperty() {
+		System.clearProperty(CURRENT_TEST_PACKAGE);
 	}
 
 
-	@Configuration
-	static class Config {
-		/* no user beans required for these tests */
+	@Nested
+	@DisplayName("in classpath")
+	class ClasspathTests {
+
+		@Nested
+		@DisplayName("with absolute path")
+		@TestPropertySource("/org/springframework/test/context/env/explicit.properties")
+		class AbsolutePathPathTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with absolute path with internal relative paths")
+		@TestPropertySource("/org/../org/springframework/test/../test/context/env/explicit.properties")
+		class AbsolutePathWithInternalRelativePathTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with relative path")
+		@TestPropertySource("explicit.properties")
+		class RelativePathTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with relative paths")
+		@TestPropertySource("../env/../env/../../context/env/explicit.properties")
+		class RelativePathsTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with placeholder")
+		@TestPropertySource("/${current.test.package}/explicit.properties")
+		class WithPlaceholderTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with placeholder and classpath: prefix")
+		@TestPropertySource("classpath:${current.test.package}/explicit.properties")
+		class WithPlaceholderAndClasspathPrefixTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+	}
+
+	@Nested
+	@DisplayName("in file system")
+	class FileSystemTests {
+
+		@Nested
+		@DisplayName("with full local path")
+		@TestPropertySource("file:src/test/resources/org/springframework/test/context/env/explicit.properties")
+		class FullLocalPathTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with dot-path reference")
+		@TestPropertySource("file:./src/test/resources/org/springframework/test/context/env/explicit.properties")
+		class WithDotPathTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with relative path")
+		@TestPropertySource("file:../spring-test/src/test/resources/org/springframework/test/context/env/explicit.properties")
+		class WithRelativePathTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with ${current.test.package} placeholder")
+		@TestPropertySource("file:src/test/resources/${current.test.package}/explicit.properties")
+		class WithCustomPlaceholderTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with ${user.dir} placeholder")
+		@TestPropertySource("file:${user.dir}/src/test/resources/org/springframework/test/context/env/explicit.properties")
+		class WithUserDirPlaceholderTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with ${user.dir} and ${current.test.package} placeholders")
+		@TestPropertySource("file:${user.dir}/src/test/resources/${current.test.package}/explicit.properties")
+		class WithUserDirAndCustomPlaceholdersTests extends AbstractExplicitPropertiesFileTests {
+		}
+
+		@Nested
+		@DisplayName("with placeholder followed immediately by relative path")
+		@TestPropertySource("file:${user.dir}/../spring-test/src/test/resources/org/springframework/test/context/env/explicit.properties")
+		@Disabled("Currently not supported (see https://github.com/spring-projects/spring-framework/issues/23544)")
+		class WithPlaceholderFollowedByRelativePathTests extends AbstractExplicitPropertiesFileTests {
+		}
+
 	}
 
 }

spring-test/src/test/java/org/springframework/test/context/env/InheritedRelativePathPropertiesFileTestPropertySourceTests.java

@@ -27,7 +27,7 @@ import org.springframework.test.context.TestPropertySource;
  * @since 4.1
  */
 class InheritedRelativePathPropertiesFileTestPropertySourceTests extends
-		ExplicitPropertiesFileTestPropertySourceTests {
+		ExplicitPropertiesFileInClasspathTestPropertySourceTests {
 
 	/* all tests are in superclass */
 

spring-test/src/test/java/org/springframework/test/context/env/MergedPropertiesFilesTestPropertySourceTests.java

@@ -31,7 +31,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @TestPropertySource("extended.properties")
 class MergedPropertiesFilesTestPropertySourceTests extends
-		ExplicitPropertiesFileTestPropertySourceTests {
+		ExplicitPropertiesFileInClasspathTestPropertySourceTests {
 
 	@Test
 	void verifyExtendedPropertiesAreAvailableInEnvironment() {

spring-test/src/test/java/org/springframework/test/context/env/subpackage/SubpackageInheritedRelativePathPropertiesFileTestPropertySourceTests.java

@@ -17,7 +17,7 @@
 package org.springframework.test.context.env.subpackage;
 
 import org.springframework.test.context.TestPropertySource;
-import org.springframework.test.context.env.ExplicitPropertiesFileTestPropertySourceTests;
+import org.springframework.test.context.env.ExplicitPropertiesFileInClasspathTestPropertySourceTests;
 
 /**
  * Integration tests for {@link TestPropertySource @TestPropertySource}
@@ -28,7 +28,7 @@ import org.springframework.test.context.env.ExplicitPropertiesFileTestPropertySo
  * @since 4.1
  */
 class SubpackageInheritedRelativePathPropertiesFileTestPropertySourceTests extends
-		ExplicitPropertiesFileTestPropertySourceTests {
+		ExplicitPropertiesFileInClasspathTestPropertySourceTests {
 
 	/* all tests are in superclass */