package java.lang;
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.
 */
/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * 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
 *
 *      http://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.
 */

import junit.framework.TestCase;

import java.util.Map;

/**
 * Miscellaneous tests for java.lang.System.
 */
public class SystemTest extends TestCase {

  static final String[] NOT_NULL_PROPERTIES = {
      "file.separator",
      "java.class.path",
      "java.class.version",
      "java.compiler",
      "java.ext.dirs",
      "java.home",
      "java.io.tmpdir",
      "java.library.path",
      "java.specification.name",
      "java.specification.vendor",
      "java.specification.version",
      "java.vendor",
      "java.vendor.url",
      "java.version",
      "java.vm.name",
      "java.vm.specification.name",
      "java.vm.specification.vendor",
      "java.vm.specification.version",
      "java.vm.vendor",
      "java.vm.version",
      "line.separator",
      "os.arch",
      "os.name",
      "os.version",
      "path.separator",
      "user.dir",
      "user.home",
      "user.name",
  };

  static final String[] NOT_EMPTY_PROPERTIES = {
      "file.separator",
      "java.class.version",
      "java.home",
      "java.io.tmpdir",
      "java.specification.name",
      "java.specification.vendor",
      "java.specification.version",
      "java.vendor",
      "java.vendor.url",
      "java.version",
      "java.vm.specification.name",
      "java.vm.specification.vendor",
      "java.vm.specification.version",
      "java.vm.vendor",
      "java.vm.version",
      "line.separator",
      "os.arch",
      "os.name",
      "os.version",
      "path.separator",
      "user.dir",
      "user.home",
      "user.name",
  };

  public void testGetenvKey() {
    assertNotNull(System.getenv("HOME"));
    assertNull(System.getenv("SOME_VARIABLE_THAT_SHOULD_NOT_EXIST"));
  }

  public void testGetEnv() {
    Map<String, String> variables = System.getenv();
    assertNotNull(variables);
    assertFalse(variables.keySet().isEmpty());

    // Verify an immutable map was returned.
    try {
      variables.put("SOME_KEY", "some value");
      fail("Should throw UnsupportedOperationException");
    } catch (UnsupportedOperationException e) {
      // expected
    }
  }

  public void testSystemProperties() {
    for (String key : NOT_NULL_PROPERTIES) {
      assertNotNull("key not found: " + key, System.getProperty(key));
    }

    assertNull("non-existent property returned", System.getProperty("non.existent.property"));

    for (String key : NOT_EMPTY_PROPERTIES) {
      assertTrue("empty key returned: " + key, System.getProperty(key).length() > 0);
    }
  }

  private static boolean onMac() {
    return System.getProperty("os.name").equals("Mac OS X");
  }
}