/*
 * Copyright 2012-2017 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
 *
 *      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 org.springframework.boot.context.properties.source;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;

import org.springframework.boot.context.properties.source.ConfigurationPropertyName.Form;

import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.fail;

/**
 * Tests for {@link ConfigurationPropertyName}.
 *
 * @author Phillip Webb
 * @author Madhura Bhave
 * @author Eddú Meléndez
 */
public class ConfigurationPropertyNameTests {

	@Rule
	public ExpectedException thrown = ExpectedException.none();

	@Test
	public void ofNameShouldNotBeNull() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("Name must not be null");
		ConfigurationPropertyName.of(null);
	}

	@Test
	public void ofNameShouldNotStartWithNumber() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of("1foo");
	}

	@Test
	public void ofNameShouldNotStartWithDash() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of("-foo");
	}

	@Test
	public void ofNameShouldNotStartWithDot() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of(".foo");
	}

	@Test
	public void ofNameShouldNotEndWithDot() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of("foo.");
	}

	@Test
	public void ofNameShouldNotContainUppercase() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of("fOo");
	}

	@Test
	public void ofNameShouldNotContainInvalidChars() throws Exception {
		String invalid = "_@$%*+=':;";
		for (char c : invalid.toCharArray()) {
			try {
				ConfigurationPropertyName.of("foo" + c);
				fail("Did not throw for invalid char " + c);
			}
			catch (IllegalArgumentException ex) {
				assertThat(ex.getMessage()).contains("is not valid");
			}
		}
	}

	@Test
	public void ofNameWhenSimple() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("name");
		assertThat(name.toString()).isEqualTo("name");
		assertThat(name.getNumberOfElements()).isEqualTo(1);
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("name");
		assertThat(name.isIndexed(0)).isFalse();
	}

	@Test
	public void ofNameWhenRunOnAssociative() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo[bar]");
		assertThat(name.toString()).isEqualTo("foo[bar]");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("bar");
		assertThat(name.isIndexed(0)).isFalse();
		assertThat(name.isIndexed(1)).isTrue();
	}

	@Test
	public void ofNameWhenDotOnAssociative() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo.bar");
		assertThat(name.toString()).isEqualTo("foo.bar");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("bar");
		assertThat(name.isIndexed(0)).isFalse();
		assertThat(name.isIndexed(1)).isFalse();
	}

	@Test
	public void ofNameWhenDotAndAssociative() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo.[bar]");
		assertThat(name.toString()).isEqualTo("foo[bar]");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("bar");
		assertThat(name.isIndexed(0)).isFalse();
		assertThat(name.isIndexed(1)).isTrue();
	}

	@Test
	public void ofNameWhenDoubleRunOnAndAssociative() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo[bar]baz");
		assertThat(name.toString()).isEqualTo("foo[bar].baz");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("bar");
		assertThat(name.getElement(2, Form.ORIGINAL)).isEqualTo("baz");
		assertThat(name.isIndexed(0)).isFalse();
		assertThat(name.isIndexed(1)).isTrue();
		assertThat(name.isIndexed(2)).isFalse();
	}

	@Test
	public void ofNameWhenDoubleDotAndAssociative() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo.[bar].baz");
		assertThat(name.toString()).isEqualTo("foo[bar].baz");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("bar");
		assertThat(name.getElement(2, Form.ORIGINAL)).isEqualTo("baz");
		assertThat(name.isIndexed(0)).isFalse();
		assertThat(name.isIndexed(1)).isTrue();
		assertThat(name.isIndexed(2)).isFalse();
	}

	@Test
	public void ofNameWhenMissingCloseBracket() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of("[bar");
	}

	@Test
	public void ofNameWhenMissingOpenBracket() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of("bar]");
	}

	@Test
	public void ofNameWithWhitespaceInName() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("is not valid");
		ConfigurationPropertyName.of("foo. bar");
	}

	@Test
	public void ofNameWithWhitespaceInAssociativeElement() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo[b a r]");
		assertThat(name.toString()).isEqualTo("foo[b a r]");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("b a r");
		assertThat(name.isIndexed(0)).isFalse();
		assertThat(name.isIndexed(1)).isTrue();
	}

	@Test
	public void ofNameWithUppercaseInAssociativeElement() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo[BAR]");
		assertThat(name.toString()).isEqualTo("foo[BAR]");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("BAR");
		assertThat(name.isIndexed(0)).isFalse();
		assertThat(name.isIndexed(1)).isTrue();
	}

	@Test
	public void ofWhenNameIsEmptyShouldReturnEmptyName() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("");
		assertThat(name.toString()).isEqualTo("");
		assertThat(name.append("foo").toString()).isEqualTo("foo");
	}

	@Test
	public void adaptWhenNameIsNullShouldThrowException() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("Name must not be null");
		ConfigurationPropertyName.adapt(null, '.');
	}

	@Test
	public void adaptWhenElementValueProcessorIsNullShouldThrowException()
			throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("ElementValueProcessor must not be null");
		ConfigurationPropertyName.adapt("foo", '.', null);
	}

	@Test
	public void adaptShouldCreateName() throws Exception {
		ConfigurationPropertyName expected = ConfigurationPropertyName.of("foo.bar.baz");
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("foo.bar.baz",
				'.');
		assertThat(name).isEqualTo(expected);
	}

	@Test
	public void adapShouldStripInvalidChars() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("f@@.b%r", '.');
		assertThat(name.getElement(0, Form.UNIFORM)).isEqualTo("f");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("f");
		assertThat(name.getElement(1, Form.UNIFORM)).isEqualTo("br");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("br");
		assertThat(name.toString()).isEqualTo("f.br");
	}

	@Test
	public void adaptShouldSupportUnderscore() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("f-_o.b_r", '.');
		assertThat(name.getElement(0, Form.UNIFORM)).isEqualTo("fo");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("f-_o");
		assertThat(name.getElement(1, Form.UNIFORM)).isEqualTo("br");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("b_r");
		assertThat(name.toString()).isEqualTo("f-o.br");
	}

	@Test
	public void adaptShouldSupportMixedCase() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("fOo.bAr", '.');
		assertThat(name.getElement(0, Form.UNIFORM)).isEqualTo("foo");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("fOo");
		assertThat(name.getElement(1, Form.UNIFORM)).isEqualTo("bar");
		assertThat(name.getElement(1, Form.ORIGINAL)).isEqualTo("bAr");
		assertThat(name.toString()).isEqualTo("foo.bar");
	}

	@Test
	public void adaptShouldUseElementValueProcessor() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("FOO_THE-BAR",
				'_', (c) -> c.toString().replace("-", ""));
		assertThat(name.toString()).isEqualTo("foo.thebar");
	}

	@Test
	public void adaptShouldSupportIndexedElements() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("foo", '.');
		assertThat(name.toString()).isEqualTo("foo");
		assertThat(name.getNumberOfElements()).isEqualTo(1);
		name = ConfigurationPropertyName.adapt("[foo]", '.');
		assertThat(name.toString()).isEqualTo("[foo]");
		assertThat(name.getNumberOfElements()).isEqualTo(1);
		name = ConfigurationPropertyName.adapt("foo.bar", '.');
		assertThat(name.toString()).isEqualTo("foo.bar");
		assertThat(name.getNumberOfElements()).isEqualTo(2);
		name = ConfigurationPropertyName.adapt("foo[foo.bar]", '.');
		assertThat(name.toString()).isEqualTo("foo[foo.bar]");
		assertThat(name.getNumberOfElements()).isEqualTo(2);
		name = ConfigurationPropertyName.adapt("foo.[bar].baz", '.');
		assertThat(name.toString()).isEqualTo("foo[bar].baz");
		assertThat(name.getNumberOfElements()).isEqualTo(3);
	}

	@Test
	public void isEmptyWhenEmptyShouldReturnTrue() throws Exception {
		assertThat(ConfigurationPropertyName.of("").isEmpty()).isTrue();
	}

	@Test
	public void isEmptyWhenNotEmptyShouldReturnFalse() throws Exception {
		assertThat(ConfigurationPropertyName.of("x").isEmpty()).isFalse();
	}

	@Test
	public void isLastElementIndexedWhenIndexedShouldReturnTrue() throws Exception {
		assertThat(ConfigurationPropertyName.of("foo[0]").isLastElementIndexed())
				.isTrue();
	}

	@Test
	public void isLastElementIndexedWhenNotIndexedShouldReturnFalse() throws Exception {
		assertThat(ConfigurationPropertyName.of("foo.bar").isLastElementIndexed())
				.isFalse();
		assertThat(ConfigurationPropertyName.of("foo[0].bar").isLastElementIndexed())
				.isFalse();
	}

	@Test
	public void getLastElementShouldGetLastElement() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("foo.bAr", '.');
		assertThat(name.getLastElement(Form.ORIGINAL)).isEqualTo("bAr");
		assertThat(name.getLastElement(Form.UNIFORM)).isEqualTo("bar");
	}

	@Test
	public void getLastElementWhenEmptyShouldReturnEmptyString() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.EMPTY;
		assertThat(name.getLastElement(Form.ORIGINAL)).isEqualTo("");
		assertThat(name.getLastElement(Form.UNIFORM)).isEqualTo("");
	}

	@Test
	public void getElementShouldNotIncludeAngleBrackets() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("[foo]");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("foo");
		assertThat(name.getElement(0, Form.UNIFORM)).isEqualTo("foo");
	}

	@Test
	public void getElementInUniformFormShouldNotIncludeDashes() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("f-o-o");
		assertThat(name.getElement(0, Form.ORIGINAL)).isEqualTo("f-o-o");
		assertThat(name.getElement(0, Form.UNIFORM)).isEqualTo("foo");
	}

	@Test
	public void getElementInOriginalFormShouldReturnElement() throws Exception {
		assertThat(getElements("foo.bar", Form.ORIGINAL)).containsExactly("foo", "bar");
		assertThat(getElements("foo[0]", Form.ORIGINAL)).containsExactly("foo", "0");
		assertThat(getElements("foo.[0]", Form.ORIGINAL)).containsExactly("foo", "0");
		assertThat(getElements("foo[baz]", Form.ORIGINAL)).containsExactly("foo", "baz");
		assertThat(getElements("foo.baz", Form.ORIGINAL)).containsExactly("foo", "baz");
		assertThat(getElements("foo[baz].bar", Form.ORIGINAL)).containsExactly("foo",
				"baz", "bar");
		assertThat(getElements("foo.baz.bar", Form.ORIGINAL)).containsExactly("foo",
				"baz", "bar");
		assertThat(getElements("foo.baz-bar", Form.ORIGINAL)).containsExactly("foo",
				"baz-bar");
	}

	@Test
	public void getElementInUniformFormShouldReturnElement() throws Exception {
		assertThat(getElements("foo.bar", Form.UNIFORM)).containsExactly("foo", "bar");
		assertThat(getElements("foo[0]", Form.UNIFORM)).containsExactly("foo", "0");
		assertThat(getElements("foo.[0]", Form.UNIFORM)).containsExactly("foo", "0");
		assertThat(getElements("foo[baz]", Form.UNIFORM)).containsExactly("foo", "baz");
		assertThat(getElements("foo.baz", Form.UNIFORM)).containsExactly("foo", "baz");
		assertThat(getElements("foo[baz].bar", Form.UNIFORM)).containsExactly("foo",
				"baz", "bar");
		assertThat(getElements("foo.baz.bar", Form.UNIFORM)).containsExactly("foo", "baz",
				"bar");
		assertThat(getElements("foo.baz-bar", Form.UNIFORM)).containsExactly("foo",
				"bazbar");
	}

	private List<CharSequence> getElements(String name, Form form) {
		ConfigurationPropertyName propertyName = ConfigurationPropertyName.of(name);
		List<CharSequence> result = new ArrayList<>(propertyName.getNumberOfElements());
		for (int i = 0; i < propertyName.getNumberOfElements(); i++) {
			result.add(propertyName.getElement(i, form));
		}
		return result;
	}

	@Test
	public void getNumberOfElementsShouldReturnNumberOfElement() throws Exception {
		assertThat(ConfigurationPropertyName.of("").getNumberOfElements()).isEqualTo(0);
		assertThat(ConfigurationPropertyName.of("x").getNumberOfElements()).isEqualTo(1);
		assertThat(ConfigurationPropertyName.of("x.y").getNumberOfElements())
				.isEqualTo(2);
		assertThat(ConfigurationPropertyName.of("x[0].y").getNumberOfElements())
				.isEqualTo(3);
	}

	@Test
	public void appendWhenNotIndexedShouldAppendWithDot() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		assertThat(name.append("bar").toString()).isEqualTo("foo.bar");
	}

	@Test
	public void appendWhenIndexedShouldAppendWithBrackets() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo")
				.append("[bar]");
		assertThat(name.isLastElementIndexed()).isTrue();
		assertThat(name.toString()).isEqualTo("foo[bar]");
	}

	@Test
	public void appendWhenElementNameIsNotValidShouldThrowException() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("Element value '1bar' is not valid");
		ConfigurationPropertyName.of("foo").append("1bar");
	}

	@Test
	public void appendWhenElementNameMultiDotShouldThrowException() throws Exception {
		this.thrown.expect(IllegalArgumentException.class);
		this.thrown.expectMessage("Element value 'bar.baz' must be a single item");
		ConfigurationPropertyName.of("foo").append("bar.baz");
	}

	@Test
	public void appendWhenElementNameIsNullShouldReturnName() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		assertThat((Object) name.append((String) null)).isSameAs(name);
	}

	@Test
	public void chopWhenLessThenSizeShouldReturnChopped() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo.bar.baz");
		assertThat(name.chop(1).toString()).isEqualTo("foo");
		assertThat(name.chop(2).toString()).isEqualTo("foo.bar");
	}

	@Test
	public void chopWhenGreaterThanSizeShouldReturnExisting() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo.bar.baz");
		assertThat(name.chop(4)).isEqualTo(name);
	}

	@Test
	public void chopWhenEqualToSizeShouldReturnExisting() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo.bar.baz");
		assertThat(name.chop(3)).isEqualTo(name);
	}

	@Test
	public void isParentOfWhenSameShouldReturnFalse() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		assertThat(name.isParentOf(name)).isFalse();
	}

	@Test
	public void isParentOfWhenParentShouldReturnTrue() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		ConfigurationPropertyName child = ConfigurationPropertyName.of("foo.bar");
		assertThat(name.isParentOf(child)).isTrue();
		assertThat(child.isParentOf(name)).isFalse();
	}

	@Test
	public void isParentOfWhenGrandparentShouldReturnFalse() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		ConfigurationPropertyName grandchild = ConfigurationPropertyName
				.of("foo.bar.baz");
		assertThat(name.isParentOf(grandchild)).isFalse();
		assertThat(grandchild.isParentOf(name)).isFalse();
	}

	@Test
	public void isParentOfWhenRootReturnTrue() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("");
		ConfigurationPropertyName child = ConfigurationPropertyName.of("foo");
		ConfigurationPropertyName grandchild = ConfigurationPropertyName.of("foo.bar");
		assertThat(name.isParentOf(child)).isTrue();
		assertThat(name.isParentOf(grandchild)).isFalse();
		assertThat(child.isAncestorOf(name)).isFalse();
	}

	@Test
	public void isAncestorOfWhenSameShouldReturnFalse() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		assertThat(name.isAncestorOf(name)).isFalse();
	}

	@Test
	public void isAncestorOfWhenParentShouldReturnTrue() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		ConfigurationPropertyName child = ConfigurationPropertyName.of("foo.bar");
		assertThat(name.isAncestorOf(child)).isTrue();
		assertThat(child.isAncestorOf(name)).isFalse();
	}

	@Test
	public void isAncestorOfWhenGrandparentShouldReturnTrue() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("foo");
		ConfigurationPropertyName grandchild = ConfigurationPropertyName
				.of("foo.bar.baz");
		assertThat(name.isAncestorOf(grandchild)).isTrue();
		assertThat(grandchild.isAncestorOf(name)).isFalse();
	}

	@Test
	public void isAncestorOfWhenRootShouldReturnTrue() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.of("");
		ConfigurationPropertyName grandchild = ConfigurationPropertyName
				.of("foo.bar.baz");
		assertThat(name.isAncestorOf(grandchild)).isTrue();
		assertThat(grandchild.isAncestorOf(name)).isFalse();
	}

	@Test
	public void compareShouldSortNames() throws Exception {
		List<ConfigurationPropertyName> names = new ArrayList<>();
		names.add(ConfigurationPropertyName.of("foo[10]"));
		names.add(ConfigurationPropertyName.of("foo.bard"));
		names.add(ConfigurationPropertyName.of("foo[2]"));
		names.add(ConfigurationPropertyName.of("foo.bar"));
		names.add(ConfigurationPropertyName.of("foo.baz"));
		names.add(ConfigurationPropertyName.of("foo"));
		Collections.sort(names);
		assertThat(names.stream().map(ConfigurationPropertyName::toString)
				.collect(Collectors.toList())).containsExactly("foo", "foo[2]", "foo[10]",
						"foo.bar", "foo.bard", "foo.baz");
	}

	@Test
	public void toStringShouldBeLowerCaseDashed() throws Exception {
		ConfigurationPropertyName name = ConfigurationPropertyName.adapt("fOO.b_-a-r",
				'.');
		assertThat(name.toString()).isEqualTo("foo.b-a-r");
	}

	@Test
	public void equalsAndHashCode() throws Exception {
		ConfigurationPropertyName n01 = ConfigurationPropertyName.of("foo[bar]");
		ConfigurationPropertyName n02 = ConfigurationPropertyName.of("foo[bar]");
		ConfigurationPropertyName n03 = ConfigurationPropertyName.of("foo.bar");
		ConfigurationPropertyName n04 = ConfigurationPropertyName.of("f-o-o.b-a-r");
		ConfigurationPropertyName n05 = ConfigurationPropertyName.of("foo[BAR]");
		ConfigurationPropertyName n06 = ConfigurationPropertyName.of("oof[bar]");
		ConfigurationPropertyName n07 = ConfigurationPropertyName.of("foo.bar");
		ConfigurationPropertyName n08 = ConfigurationPropertyName.EMPTY;
		ConfigurationPropertyName n09 = ConfigurationPropertyName.of("foo");
		ConfigurationPropertyName n10 = ConfigurationPropertyName.of("fo");
		ConfigurationPropertyName n11 = ConfigurationPropertyName.adapt("foo.BaR", '.');
		assertThat(n01.hashCode()).isEqualTo(n02.hashCode());
		assertThat(n01.hashCode()).isEqualTo(n02.hashCode());
		assertThat(n01.hashCode()).isEqualTo(n03.hashCode());
		assertThat(n01.hashCode()).isEqualTo(n04.hashCode());
		assertThat(n01.hashCode()).isEqualTo(n11.hashCode());
		assertThat((Object) n01).isEqualTo(n01);
		assertThat((Object) n01).isEqualTo(n02);
		assertThat((Object) n01).isEqualTo(n03);
		assertThat((Object) n01).isEqualTo(n04);
		assertThat((Object) n11).isEqualTo(n03);
		assertThat((Object) n03).isEqualTo(n11);
		assertThat((Object) n01).isNotEqualTo(n05);
		assertThat((Object) n01).isNotEqualTo(n06);
		assertThat((Object) n07).isNotEqualTo(n08);
		assertThat((Object) n09).isNotEqualTo(n10);
		assertThat((Object) n10).isNotEqualTo(n09);
	}

	@Test
	public void isValidWhenValidShouldReturnTrue() throws Exception {
		assertThat(ConfigurationPropertyName.isValid("")).isTrue();
		assertThat(ConfigurationPropertyName.isValid("foo")).isTrue();
		assertThat(ConfigurationPropertyName.isValid("foo.bar")).isTrue();
		assertThat(ConfigurationPropertyName.isValid("foo[0]")).isTrue();
		assertThat(ConfigurationPropertyName.isValid("foo[0].baz")).isTrue();
		assertThat(ConfigurationPropertyName.isValid("foo.b1")).isTrue();
		assertThat(ConfigurationPropertyName.isValid("foo.b-a-r")).isTrue();
		assertThat(ConfigurationPropertyName.isValid("foo[FooBar].baz")).isTrue();
	}

	@Test
	public void isValidWhenNotValidShouldReturnFalse() throws Exception {
		assertThat(ConfigurationPropertyName.isValid(null)).isFalse();
		assertThat(ConfigurationPropertyName.isValid("1foo")).isFalse();
		assertThat(ConfigurationPropertyName.isValid("FooBar")).isFalse();
		assertThat(ConfigurationPropertyName.isValid("foo!bar")).isFalse();
	}

}
