org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/eval/NegativeCodeSnippetTest.java

/*******************************************************************************
 * Copyright (c) 2000, 2014 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.core.tests.eval;

import java.util.Map;

import junit.framework.Test;

import org.eclipse.jdt.core.compiler.CategorizedProblem;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.lookup.ProblemReasons;
import org.eclipse.jdt.internal.compiler.problem.ProblemSeverities;
import org.eclipse.jdt.internal.eval.GlobalVariable;
/**
 * Negative tests for code snippet. Only compilation problems should be reported in
 * these tests.
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
public class NegativeCodeSnippetTest extends EvaluationTest implements ProblemSeverities, ProblemReasons {
/**
 * Creates a new NegativeCodeSnippetTest.
 */
public NegativeCodeSnippetTest(String name) {
	super(name);
}
public static Test suite() {
	return setupSuite(testClass());
}
/**
 * Test a scenario where the change of the package declaration causes a problem in a code snippet.
 */
public void _testChangePackage() {
	if (isJRockitVM()) return;
	try {
		// define the package
		this.context.setPackageName("java.util.zip".toCharArray());

		// evaluate a code snippet that uses this variable
		char[] codeSnippet = "new InflaterInputStream(new java.io.ByteArrayInputStream(new byte[0])).len".toCharArray();
		evaluateWithExpectedDisplayString(
			codeSnippet,
			"0".toCharArray());

		// back to the default package but with correct import
		this.context.setPackageName(new char[0]);
		this.context.setImports(new char[][] {"java.util.zip.*".toCharArray()});

		// evaluate same code snippet
		evaluateWithExpectedProblem(
			codeSnippet,
			newProblem(IProblem.NotVisibleField, Error, 71, 73, 1)); // The field len is not visible

		// back to the default package and with no imports
		this.context.setImports(new char[0][]);

		// evaluate same code snippet
		evaluateWithExpectedProblem(
			codeSnippet,
			newProblem(IProblem.UndefinedType, Error, 4, 22, 1)); // The type InflaterInputStream is undefined
	} finally {
		// Clean up
		this.context.setPackageName(new char[0]);
		this.context.setImports(new char[0][]);
	}
}
public static Class testClass() {
	return NegativeCodeSnippetTest.class;
}
/**
 * Test a code snippet which declares a class that uses an expression as a returned statement
 * in one of its methods.
 */
public void testExpressionInInnerClass() {
	//TODO (david) Syntax error diagnose should be improved in this case.
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"class X {",
		"	int foo() {",
		"		1 + 1",
		"	}",
		"}",
		"return new X().foo();"}),
		newProblem(IProblem.ParsingError, Error, 21, 21, 2)); // Syntax error on token "+"
}
/**
 * Test extra closing curly bracket.
 */
public void testExtraClosingCurlyBracket() {
	//TODO (david) Syntax error diagnose should be improved in this case.
	// just an expression with an extra curly bracket
	evaluateWithExpectedProblem(
		"1 + 2}".toCharArray(),
		newProblem(IProblem.ParsingError, Error, 0, 0, 1)); // Unmatched bracket

	// a statement followed by an unreachable expression with an extra curly bracket
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"return 1 + 1;",
		" 2 + 2}"}),
		newProblem(IProblem.ParsingError, Error, 15, 15, 2)); // Unmatched bracket
}
/**
 * Test extra open round bracket.
 */
public void testExtraOpenRoundBracket() {
	evaluateWithExpectedProblem(
		"foo((a);".toCharArray(),
		newProblem(IProblem.ParsingErrorInsertToComplete, Error, 6, 6, 1)); // Unmatched bracket
}
/**
 * Test a code snippet that contains an expression followed by a semi-colon.
 */
public void testExtraSemiColonInExpression() {
	evaluateWithExpectedProblem(
		"1;".toCharArray(),
		newProblem(IProblem.ParsingErrorInsertToComplete, Error, 0, 0, 1)); // Syntax error on token EOF
}
/**
 * Test access to a non existing field.
 * (regression test for bug 25250 Scrapbook shows wrong error message)
 */
public void testInvalidField() {
	evaluateWithExpectedProblem(
		("String s = \"\";\n" +
		"s.length").toCharArray(),
		"length cannot be resolved or is not a field\n");
}
/**
 * Test a code snippet which is valid but the evaluation context imports have problems.
 */
public void testInvalidImport() {
	try {
		// problem on the first import
		this.context.setImports(new char[][] {"bar.Y".toCharArray()});
		evaluateWithExpectedImportProblem(buildCharArray(new String[] {
			"class X {",
			"	Y foo = new Y();",
			"}",
			"return new X().foo;"}),
			"bar.Y".toCharArray(),
			newProblem(IProblem.ImportNotFound, Error, 0, 4, 1)); // The import bar.Y could not be resolved

		// problem on the second import
		this.context.setImports(new char[][] {"java.io.*".toCharArray(), "{".toCharArray()});
		evaluateWithExpectedImportProblem(buildCharArray(new String[] {
			"new File(\"c:\\temp\")"}),
			"{".toCharArray(),
			newProblem(IProblem.ParsingErrorInvalidToken, Error, 0, 0, 1)); // Syntax error on token "{", "Identifier" expected
	} finally {
		// Clean up
		this.context.setImports(new char[0][]);
	}
}
/**
 * Test use of this.
 */
public void testInvalidUseOfThisInSnippet() {
	evaluateWithExpectedProblem(
		"this".toCharArray(),
		"Cannot use this in a static context\n");
}
/**
 * Test use of this.
 */
public void testInvalidUseOfThisInSnippet2() {
	// just an expression with an extra curly bracket
	evaluateWithExpectedProblem(
		"return this;".toCharArray(),
		"Cannot use this in a static context\n");
}
/**
 * Test a code snippet that misses a closing round bracket.
 */
public void testMissingClosingRoundBracket() {
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"System.out.println(\"3 + 3\";"}),
		newProblem(IProblem.ParsingErrorInsertToComplete, Error, 19, 25, 1)); // Unmatched bracket
}
/**
 * Test a code snippet that contains a string that misses the closing double quote .
 */
public void testMissingDoubleQuote() {
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"System.out.println(\"3 + 3 = );",
		"3 + 3"}),
		newProblem(IProblem.UnterminatedString , Error, 19, 29, 1)); // String literal is not properly closed by a double-quote
}
/**
 * Test an expression which is not the last statement.
 */
public void testNonLastExpressionStatement() {
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"1 == '1';",
		"true"}),
		newProblem(IProblem.ParsingErrorInvalidToken, Error, 2, 3, 1)); // Syntax error on token "=="
}
/**
 * Test a problem in the returned expression.
 */
public void testProblemInExpression() {
	evaluateWithExpectedProblem(
		"new Object(); 3 + ".toCharArray(),
		newProblem(IProblem.ParsingErrorDeleteToken, Error, 16, 16, 1)); // Syntax error on token '+'
}
/**
 * Test a problem in the returned expression.
 */
public void testProblemInExpression2() {
	evaluateWithExpectedProblem(
		"new UnknownClass()".toCharArray(),
		newProblem(IProblem.UndefinedType, Error, 4, 15, 1)); // UnknownClass cannot be resolved to a type
}
/**
 * Test a code snippet which declares a class that has a problem.
 */
public void testProblemInInnerClass() {
	// class declared before the last expression
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"class X {",
		"	Y foo = new Y();",
		"}",
		"return new X().foo;"}),
		newProblem(IProblem.UndefinedType, Error, 11, 11, 2)); // The type Y is undefined

	// class declared as part of the last expression
	evaluateWithExpectedWarningAndDisplayString(buildCharArray(new String[] {
		"return new Object() {",
		"	public String toString() {",
		"		int i = 0;",
		"		return \"an inner class\";",
		"	}",
		"};"}),
		new CategorizedProblem[] {
			newProblem(IProblem.LocalVariableIsNeverUsed, Warning, 56, 56, 3), // The local variable i is never used
		},
		"an inner class".toCharArray());
}
/**
 * Test a problem in the statement before the returned expression.
 */
public void testProblemInPreviousStatement() {
	//TODO (david) Syntax error diagnose should be improved in this case.
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"return foo(a a);",
		"1 + 3"}),
		newProblem(IProblem.ParsingErrorDeleteToken, Error, 13, 13, 1)); //  Syntax error on token "a"
}
/**
 * Test a code snippet that has a problem in a return statement.
 */
public void testProblemInReturnStatement() {
	evaluateWithExpectedProblem(
		"return 1 ++ 1;".toCharArray(),
		newProblem(IProblem.InvalidUnaryExpression, Error, 7, 7, 1)); // Invalid argument to operation ++/--
}
/**
 * Test a scenario where the removal of an import causes a problem in a code snippet.
 */
public void testRemoveImport() {
	try {
		// define the import
		this.context.setImports(new char[][] {"java.io.*".toCharArray()});

		// evaluate a code snippet that uses this variable
		char[] codeSnippet = "new File(\"c:\\\\temp\")".toCharArray();
		evaluateWithExpectedDisplayString(
			codeSnippet,
			"c:\\temp".toCharArray());

		// remove the import
		this.context.setImports(new char[0][]);

		// evaluate same code snippet
		evaluateWithExpectedProblem(
			codeSnippet,
			newProblem(IProblem.UndefinedType, Error, 4, 7, 1)); // The type File is undefined
	} finally {
		// Clean up
		this.context.setImports(new char[0][]);
	}
}
/**
 * Test a scenario where the removal of a variable causes a problem in a code snippet.
 */
public void testRemoveVariable() {
	GlobalVariable var = null;
	try {
		// define the variable
		var = this.context.newVariable("int".toCharArray(), "i".toCharArray(), "1".toCharArray());
		installVariables(1);

		// evaluate a code snippet that uses this variable
		char[] codeSnippet = "i".toCharArray();
		evaluateWithExpectedDisplayString(
			codeSnippet,
			"1".toCharArray());

		// remove the variable
		this.context.deleteVariable(var);
		installVariables(0);

		// evaluate same code snippet
		evaluateWithExpectedProblem(
			codeSnippet,
			newProblem(IProblem.UnresolvedVariable, Error, 0, 0, 1)); // i cannot be resolved to a variable
	} finally {
		// Clean up
		if (var != null) {
			this.context.deleteVariable(var);
		}
	}
}
/**
 * Test a code snippet that contains an expression which is not reachable.
 */
public void testUnreachableExpression() {
	evaluateWithExpectedProblem(buildCharArray(new String[] {
		"return 1 + 1;",
		"2 + 2"}),
		newProblem(IProblem.CodeCannotBeReached, Error, 14, 18, 2)); // Unreachable code
}
/**
 * Test a code snippet which is valid but never uses the evaluation context imports.
 * (regression test for bug 18922 Scrapbook does not come back when errors in snippet)
 */
public void testUnusedImport() {
	try {
		this.context.setImports(new char[][] {"java.util.*".toCharArray()});

		// evaluate with import as error
		Map options = getCompilerOptions();
		options.put(CompilerOptions.OPTION_ReportUnusedImport, CompilerOptions.ERROR);

		// force evaluation so that the following evaluation will use a CodeSnippetEvaluator instead
		// of a VariableEvualator
		evaluateWithExpectedValue("1".toCharArray(), "1".toCharArray(), "int".toCharArray());

		evaluateWithExpectedImportProblem(
			"new String(\"NOPE\")".toCharArray(),
			"java.util.*".toCharArray(),
			options,
			newProblem(IProblem.UnusedImport, Error, 0, 10, 1)); // The import java.util.* is unused
	} finally {
		// Clean up
		this.context.setImports(new char[0][]);
	}
}
/**
 * Test a code snippet that has warnings but no errors.
 */
public void testWarning() {
	evaluateWithExpectedWarningAndDisplayString(buildCharArray(new String[] {
		"int i;",
		"1 + 1"}),
		new CategorizedProblem[] {
			newProblem(IProblem.LocalVariableIsNeverUsed, Warning, 4, 4, 1), // The local variable i is never used
		},
		"2".toCharArray());
}
}