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/*
* Copyright (C) 2011 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.
*/
package libcore.java.lang;
public class StringBuilderTest extends junit.framework.TestCase {
// See https://code.google.com/p/android/issues/detail?id=60639
public void test_deleteChatAt_lastRange() {
StringBuilder sb = new StringBuilder("oarFish_");
sb.append('a');
String oarFishA = sb.toString();
sb.deleteCharAt(sb.length() - 1);
sb.append('b');
String oarFishB = sb.toString();
assertEquals("oarFish_a", oarFishA);
assertEquals("oarFish_b", oarFishB);
}
// See https://code.google.com/p/android/issues/detail?id=60639
public void test_deleteCharAt_lastChar() {
StringBuilder sb = new StringBuilder();
sb.append('a');
String a = sb.toString();
sb.deleteCharAt(0);
sb.append('b');
String b = sb.toString();
assertEquals("a", a);
assertEquals("b", b);
}
// See https://code.google.com/p/android/issues/detail?id=60639
public void test_delete_endsAtLastChar() {
StringBuilder sb = new StringBuilder("newGuineaSinging");
sb.append("Dog");
String dog = sb.toString();
sb.delete(sb.length() - 3, sb.length());
sb.append("Cat");
String cat = sb.toString();
// NOTE: It's important that these asserts stay at the end of this test.
// We're trying to make sure that replacing chars in the builder does not
// change strings that have already been returned from it.
assertEquals("newGuineaSingingDog", dog);
assertEquals("newGuineaSingingCat", cat);
}
public void test_deleteCharAt_boundsChecks() {
StringBuilder sb = new StringBuilder("yeti");
try {
sb.deleteCharAt(sb.length());
fail();
} catch (StringIndexOutOfBoundsException expected) {
}
try {
sb.deleteCharAt(-1);
fail();
} catch (StringIndexOutOfBoundsException expected) {
}
}
public void test_delete_boundsChecks() throws Exception {
StringBuilder sb = new StringBuilder("yeti");
// The cases below ahould not throw (even though they are clearly invalid
// ranges), because we promise not to throw if start == count as long as
// end >= start.
sb.delete(sb.length(), sb.length() + 2);
sb.delete(sb.length(), sb.length());
sb.delete(2, 2);
assertEquals("yeti", sb.toString());
// We must throw if start > count....
try {
sb.delete(sb.length() + 2, sb.length() + 3);
fail();
} catch (StringIndexOutOfBoundsException expected) {
}
// ... even if the length of the range is 0.
try {
sb.delete(sb.length() + 2, sb.length() + 2);
fail();
} catch (StringIndexOutOfBoundsException expected) {
}
// Must throw if start < 0.
try {
sb.delete(-1, sb.length() -1);
fail();
} catch (StringIndexOutOfBoundsException expected) {
}
// A few commonly used specializations: sb.delete(0, 0) on an empty
// builder is a particularly common pattern.
StringBuilder sb2 = new StringBuilder();
sb2.delete(0, sb2.length());
sb2.delete(0, 12);
}
// We shouldn't throw if the end index is > count, we should clamp it
// instead.
public void test_delete_clampsEnd() throws Exception {
StringBuilder sb = new StringBuilder("mogwai");
sb.delete(sb.length() - 1 , sb.length() + 2);
assertEquals("mogwa", sb.toString());
sb.delete(sb.length() - 1, sb.length());
assertEquals("mogw", sb.toString());
}
}
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