Disable environment variable tests on Java 17+ (#534 / #535)

The environment variable extension / the code under test uses
reflective access to change otherwise immutable environment
variables. On Java 17+, this leads to an
`InaccessibleObjectException`.

See also: #509

Closes: #534
PR: #535

src/test/java/org/junitpioneer/jupiter/EnvironmentVariableExtensionTests.java

@@ -27,9 +27,12 @@
 import org.junit.jupiter.api.Order;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.TestMethodOrder;
+import org.junit.jupiter.api.condition.EnabledForJreRange;
+import org.junit.jupiter.api.condition.JRE;
 import org.junit.jupiter.api.extension.ExtensionConfigurationException;
 import org.junitpioneer.testkit.ExecutionResults;
 
+@EnabledForJreRange(max = JRE.JAVA_16, disabledReason = "See: https://github.com/junit-pioneer/junit-pioneer/issues/509")
 @DisplayName("EnvironmentVariable extension")
 class EnvironmentVariableExtensionTests {
 

src/test/java/org/junitpioneer/jupiter/EnvironmentVariableUtilsTests.java

@@ -23,7 +23,10 @@
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.condition.EnabledForJreRange;
+import org.junit.jupiter.api.condition.JRE;
 
+@EnabledForJreRange(max = JRE.JAVA_16, disabledReason = "See: https://github.com/junit-pioneer/junit-pioneer/issues/509")
 @DisplayName("JUnitPioneer system environment utilities")
 @WritesEnvironmentVariable
 class EnvironmentVariableUtilsTests {