| // Copyright 2006 The Bazel Authors. All rights reserved. |
| // |
| // 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 com.google.devtools.build.lib.syntax.util; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| import static org.junit.Assert.fail; |
| |
| import com.google.common.collect.ImmutableMap; |
| import com.google.devtools.build.lib.analysis.skylark.SkylarkModules; // a bad dependency |
| import com.google.devtools.build.lib.events.Event; |
| import com.google.devtools.build.lib.events.EventCollector; |
| import com.google.devtools.build.lib.events.EventKind; |
| import com.google.devtools.build.lib.events.ExtendedEventHandler; |
| import com.google.devtools.build.lib.events.util.EventCollectionApparatus; |
| import com.google.devtools.build.lib.packages.StarlarkSemanticsOptions; |
| import com.google.devtools.build.lib.syntax.EvalException; |
| import com.google.devtools.build.lib.syntax.EvalUtils; |
| import com.google.devtools.build.lib.syntax.Expression; |
| import com.google.devtools.build.lib.syntax.Module; |
| import com.google.devtools.build.lib.syntax.Mutability; |
| import com.google.devtools.build.lib.syntax.ParserInput; |
| import com.google.devtools.build.lib.syntax.StarlarkSemantics; |
| import com.google.devtools.build.lib.syntax.StarlarkThread; |
| import com.google.devtools.build.lib.syntax.SyntaxError; |
| import com.google.devtools.common.options.Options; |
| import com.google.devtools.common.options.OptionsParsingException; |
| import java.util.HashMap; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| import org.junit.Before; |
| |
| /** |
| * Base class for test cases that use parsing and evaluation services. |
| */ |
| public class EvaluationTestCase { |
| private EventCollectionApparatus eventCollectionApparatus = |
| new EventCollectionApparatus(EventKind.ALL_EVENTS); |
| |
| private StarlarkSemantics semantics = StarlarkSemantics.DEFAULT_SEMANTICS; |
| private final Map<String, Object> extraPredeclared = new HashMap<>(); |
| private StarlarkThread thread; |
| |
| @Before |
| public final void initialize() { |
| // TODO(adonovan): clean up the lazy initialization of thread when we disentangle |
| // Module from it. Only the module need exist early; the thread can be created |
| // immediately before execution |
| thread = newStarlarkThread(); |
| } |
| |
| // Adds a binding to the predeclared environment. |
| protected final void predeclare(String name, Object value) { |
| extraPredeclared.put(name, value); |
| } |
| |
| /** |
| * Returns a new thread using the semantics set by setSemantics(), the predeclared environment of |
| * SkylarkModules and prior calls to predeclared(), and a new mutability. Overridden by |
| * subclasses. |
| */ |
| public StarlarkThread newStarlarkThread() { |
| ImmutableMap.Builder<String, Object> envBuilder = ImmutableMap.builder(); |
| SkylarkModules.addSkylarkGlobalsToBuilder(envBuilder); // TODO(adonovan): break bad dependency |
| envBuilder.putAll(extraPredeclared); |
| |
| StarlarkThread thread = |
| StarlarkThread.builder(Mutability.create("test")) |
| .setGlobals(Module.createForBuiltins(envBuilder.build())) |
| .setSemantics(semantics) |
| .build(); |
| thread.setPrintHandler(StarlarkThread.makeDebugPrintHandler(getEventHandler())); |
| return thread; |
| } |
| |
| /** |
| * Parses the semantics flags and updates the semantics used for subsequent evaluations. Also |
| * reinitializes the thread. |
| */ |
| protected final void setSemantics(String... options) throws OptionsParsingException { |
| this.semantics = |
| Options.parse(StarlarkSemanticsOptions.class, options).getOptions().toSkylarkSemantics(); |
| |
| // Re-initialize the thread with the new semantics. See note at initialize. |
| thread = newStarlarkThread(); |
| } |
| |
| public ExtendedEventHandler getEventHandler() { |
| return eventCollectionApparatus.reporter(); |
| } |
| |
| public StarlarkThread getStarlarkThread() { |
| return thread; |
| } |
| |
| // TODO(adonovan): don't let subclasses inherit vaguely specified "helpers". |
| // Separate all the tests clearly into tests of the scanner, parser, resolver, |
| // and evaluation. |
| |
| /** Parses an expression. */ |
| protected final Expression parseExpression(String... lines) throws SyntaxError { |
| return Expression.parse(ParserInput.fromLines(lines)); |
| } |
| |
| /** Updates a binding in the module associated with the thread. */ |
| public EvaluationTestCase update(String varname, Object value) throws Exception { |
| thread.getGlobals().put(varname, value); |
| return this; |
| } |
| |
| /** Returns the value of a binding in the module associated with the thread. */ |
| public Object lookup(String varname) throws Exception { |
| return thread.getGlobals().lookup(varname); |
| } |
| |
| /** Joins the lines, parses them as an expression, and evaluates it. */ |
| public final Object eval(String... lines) throws Exception { |
| ParserInput input = ParserInput.fromLines(lines); |
| return EvalUtils.eval(input, thread.getGlobals(), thread); |
| } |
| |
| /** Joins the lines, parses them as a file, and executes it. */ |
| public final void exec(String... lines) throws SyntaxError, EvalException, InterruptedException { |
| ParserInput input = ParserInput.fromLines(lines); |
| EvalUtils.exec(input, thread.getGlobals(), thread); |
| } |
| |
| public void checkEvalError(String msg, String... input) throws Exception { |
| try { |
| exec(input); |
| fail("Expected error '" + msg + "' but got no error"); |
| } catch (SyntaxError | EvalException | EventCollectionApparatus.FailFastException e) { |
| assertThat(e).hasMessageThat().isEqualTo(msg); |
| } |
| } |
| |
| public void checkEvalErrorContains(String msg, String... input) throws Exception { |
| try { |
| exec(input); |
| fail("Expected error containing '" + msg + "' but got no error"); |
| } catch (SyntaxError | EvalException | EventCollectionApparatus.FailFastException e) { |
| assertThat(e).hasMessageThat().contains(msg); |
| } |
| } |
| |
| public void checkEvalErrorDoesNotContain(String msg, String... input) throws Exception { |
| try { |
| exec(input); |
| } catch (SyntaxError | EvalException | EventCollectionApparatus.FailFastException e) { |
| assertThat(e).hasMessageThat().doesNotContain(msg); |
| } |
| } |
| |
| // Forward relevant methods to the EventCollectionApparatus |
| public EvaluationTestCase setFailFast(boolean failFast) { |
| eventCollectionApparatus.setFailFast(failFast); |
| return this; |
| } |
| |
| public EvaluationTestCase assertNoWarningsOrErrors() { |
| eventCollectionApparatus.assertNoWarningsOrErrors(); |
| return this; |
| } |
| |
| public EventCollector getEventCollector() { |
| return eventCollectionApparatus.collector(); |
| } |
| |
| public Event assertContainsError(String expectedMessage) { |
| return eventCollectionApparatus.assertContainsError(expectedMessage); |
| } |
| |
| public Event assertContainsWarning(String expectedMessage) { |
| return eventCollectionApparatus.assertContainsWarning(expectedMessage); |
| } |
| |
| public Event assertContainsDebug(String expectedMessage) { |
| return eventCollectionApparatus.assertContainsDebug(expectedMessage); |
| } |
| |
| public EvaluationTestCase clearEvents() { |
| eventCollectionApparatus.clear(); |
| return this; |
| } |
| |
| /** Encapsulates a separate test which can be executed by a Scenario. */ |
| protected interface Testable { |
| void run() throws Exception; |
| } |
| |
| /** |
| * A test scenario (a script of steps). Beware: Scenario is an inner class that mutates its |
| * enclosing EvaluationTestCase as it executes the script. |
| */ |
| public final class Scenario { |
| private final SetupActions setup = new SetupActions(); |
| private final String[] skylarkOptions; |
| |
| public Scenario(String... skylarkOptions) { |
| this.skylarkOptions = skylarkOptions; |
| } |
| |
| private void run(Testable testable) throws Exception { |
| setSemantics(skylarkOptions); |
| testable.run(); |
| } |
| |
| /** Allows the execution of several statements before each following test. */ |
| public Scenario setUp(String... lines) { |
| setup.registerExec(lines); |
| return this; |
| } |
| |
| /** |
| * Allows the update of the specified variable before each following test |
| * |
| * @param name The name of the variable that should be updated |
| * @param value The new value of the variable |
| * @return This {@code Scenario} |
| */ |
| public Scenario update(String name, Object value) { |
| setup.registerUpdate(name, value); |
| return this; |
| } |
| |
| /** |
| * Evaluates two expressions and asserts that their results are equal. |
| * |
| * @param src The source expression to be evaluated |
| * @param expectedEvalString The expression of the expected result |
| * @return This {@code Scenario} |
| * @throws Exception |
| */ |
| public Scenario testEval(String src, String expectedEvalString) throws Exception { |
| runTest(createComparisonTestable(src, expectedEvalString, true)); |
| return this; |
| } |
| |
| /** Evaluates an expression and compares its result to the expected object. */ |
| public Scenario testExpression(String src, Object expected) throws Exception { |
| runTest(createComparisonTestable(src, expected, false)); |
| return this; |
| } |
| |
| /** Evaluates an expression and compares its result to the ordered list of expected objects. */ |
| public Scenario testExactOrder(String src, Object... items) throws Exception { |
| runTest(collectionTestable(src, items)); |
| return this; |
| } |
| |
| /** Evaluates an expression and checks whether it fails with the expected error. */ |
| public Scenario testIfExactError(String expectedError, String... lines) throws Exception { |
| runTest(errorTestable(true, expectedError, lines)); |
| return this; |
| } |
| |
| /** Evaluates the expresson and checks whether it fails with the expected error. */ |
| public Scenario testIfErrorContains(String expectedError, String... lines) throws Exception { |
| runTest(errorTestable(false, expectedError, lines)); |
| return this; |
| } |
| |
| /** Looks up the value of the specified variable and compares it to the expected value. */ |
| public Scenario testLookup(String name, Object expected) throws Exception { |
| runTest(createLookUpTestable(name, expected)); |
| return this; |
| } |
| |
| /** |
| * Creates a Testable that checks whether the evaluation of the given expression fails with the |
| * expected error. |
| * |
| * @param exactMatch whether the error message must be identical to the expected error. |
| */ |
| protected Testable errorTestable( |
| final boolean exactMatch, final String error, final String... lines) { |
| return new Testable() { |
| @Override |
| public void run() throws Exception { |
| if (exactMatch) { |
| checkEvalError(error, lines); |
| } else { |
| checkEvalErrorContains(error, lines); |
| } |
| } |
| }; |
| } |
| |
| /** |
| * Creates a Testable that checks whether the value of the expression is a sequence containing |
| * the expected elements. |
| */ |
| protected Testable collectionTestable(final String src, final Object... expected) { |
| return new Testable() { |
| @Override |
| public void run() throws Exception { |
| assertThat((Iterable<?>) eval(src)).containsExactly(expected).inOrder(); |
| } |
| }; |
| } |
| |
| /** |
| * Creates a testable that compares the value of the expression to a specified result. |
| * |
| * @param src The expression to be evaluated |
| * @param expected Either the expected object or an expression whose evaluation leads to the |
| * expected object |
| * @param expectedIsExpression Signals whether {@code expected} is an object or an expression |
| * @return An instance of Testable that runs the comparison |
| */ |
| protected Testable createComparisonTestable( |
| final String src, final Object expected, final boolean expectedIsExpression) { |
| return new Testable() { |
| @Override |
| public void run() throws Exception { |
| Object actual = eval(src); |
| Object realExpected = expected; |
| |
| // We could also print the actual object and compare the string to the expected |
| // expression, but then the order of elements would matter. |
| if (expectedIsExpression) { |
| realExpected = eval((String) expected); |
| } |
| |
| assertThat(actual).isEqualTo(realExpected); |
| } |
| }; |
| } |
| |
| /** |
| * Creates a Testable that looks up the given variable and compares its value to the expected |
| * value |
| * @param name |
| * @param expected |
| * @return An instance of Testable that does both lookup and comparison |
| */ |
| protected Testable createLookUpTestable(final String name, final Object expected) { |
| return new Testable() { |
| @Override |
| public void run() throws Exception { |
| assertThat(lookup(name)).isEqualTo(expected); |
| } |
| }; |
| } |
| |
| /** |
| * Executes the given Testable |
| * @param testable |
| * @throws Exception |
| */ |
| protected void runTest(Testable testable) throws Exception { |
| run(new TestableDecorator(setup, testable)); |
| } |
| } |
| |
| /** |
| * A simple decorator that allows the execution of setup actions before running a {@code Testable} |
| */ |
| static class TestableDecorator implements Testable { |
| private final SetupActions setup; |
| private final Testable decorated; |
| |
| public TestableDecorator(SetupActions setup, Testable decorated) { |
| this.setup = setup; |
| this.decorated = decorated; |
| } |
| |
| /** |
| * Executes all stored actions and updates plus the actual {@code Testable} |
| */ |
| @Override |
| public void run() throws Exception { |
| setup.executeAll(); |
| decorated.run(); |
| } |
| } |
| |
| /** |
| * A container for collection actions that should be executed before a test |
| */ |
| class SetupActions { |
| private List<Testable> setup; |
| |
| public SetupActions() { |
| setup = new LinkedList<>(); |
| } |
| |
| /** |
| * Registers an update to a module variable to be bound before a test |
| * |
| * @param name |
| * @param value |
| */ |
| public void registerUpdate(final String name, final Object value) { |
| setup.add( |
| new Testable() { |
| @Override |
| public void run() throws Exception { |
| EvaluationTestCase.this.update(name, value); |
| } |
| }); |
| } |
| |
| /** Registers a sequence of statements for execution prior to a test. */ |
| public void registerExec(final String... lines) { |
| setup.add( |
| new Testable() { |
| @Override |
| public void run() throws Exception { |
| EvaluationTestCase.this.exec(lines); |
| } |
| }); |
| } |
| |
| /** |
| * Executes all stored actions and updates |
| * @throws Exception |
| */ |
| public void executeAll() throws Exception { |
| for (Testable testable : setup) { |
| testable.run(); |
| } |
| } |
| } |
| } |