src/test/java/com/google/devtools/build/lib/analysis/CircularDependencyTest.java - bazel - Git at Google

 // Copyright 2014 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.analysis;

 import static com.google.common.collect.ImmutableList.toImmutableList;
 import static com.google.common.truth.Truth.assertThat;
 import static com.google.devtools.build.lib.packages.Attribute.attr;
 import static com.google.devtools.build.lib.packages.BuildType.LABEL;
 import static com.google.devtools.build.lib.packages.BuildType.NODEP_LABEL;
 import static com.google.devtools.build.lib.syntax.Type.STRING;
 import static org.junit.Assert.fail;

 import com.google.common.collect.ImmutableList;
 import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
 import com.google.devtools.build.lib.analysis.config.BuildOptions;
 import com.google.devtools.build.lib.analysis.config.transitions.SplitTransition;
 import com.google.devtools.build.lib.analysis.config.transitions.TransitionFactory;
 import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
 import com.google.devtools.build.lib.analysis.util.MockRule;
 import com.google.devtools.build.lib.events.Event;
 import com.google.devtools.build.lib.events.Location;
 import com.google.devtools.build.lib.packages.Attribute.LabelLateBoundDefault;
 import com.google.devtools.build.lib.packages.AttributeTransitionData;
 import com.google.devtools.build.lib.packages.NoSuchTargetException;
 import com.google.devtools.build.lib.packages.Package;
 import com.google.devtools.build.lib.testutil.TestRuleClassProvider;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;

 /**
  * Tests that check that dependency cycles are reported correctly.
  */
 @RunWith(JUnit4.class)
 public class CircularDependencyTest extends BuildViewTestCase {

   @Test
   public void testOneRuleCycle() throws Exception {
     checkError(
         "cycle",
         "foo.g",
         //error message
         selfEdgeMsg("//cycle:foo.g"),
         // Rule
         "genrule(name = 'foo.g',",
         "        outs = ['Foo.java'],",
         "        srcs = ['foo.g'],",
         "        cmd = 'cat $(SRCS) > $<' )");
   }

   @Test
   public void testDirectPackageGroupCycle() throws Exception {
     checkError(
         "cycle",
         "melon",
         selfEdgeMsg("//cycle:moebius"),
         "package_group(name='moebius', packages=[], includes=['//cycle:moebius'])",
         "sh_library(name='melon', visibility=[':moebius'])");
   }

   @Test
   public void testThreeLongPackageGroupCycle() throws Exception {
     String expectedEvent =
         "cycle in dependency graph:\n"
             + "    //cycle:superman\n"
             + ".-> //cycle:rock\n"
             + "|   //cycle:paper\n"
             + "|   //cycle:scissors\n"
             + "`-- //cycle:rock";
     checkError(
         "cycle",
         "superman",
         expectedEvent,
         "# dummy line",
         "package_group(name='paper', includes=['//cycle:scissors'])",
         "package_group(name='rock', includes=['//cycle:paper'])",
         "package_group(name='scissors', includes=['//cycle:rock'])",
         "sh_library(name='superman', visibility=[':rock'])");

     Event foundEvent = null;
     for (Event event : eventCollector) {
       if (event.getMessage().contains(expectedEvent)) {
         foundEvent = event;
         break;
       }
     }

     assertThat(foundEvent).isNotNull();
     Location location = foundEvent.getLocation();
     assertThat(location.getStartLineAndColumn().getLine()).isEqualTo(3);
     assertThat(location.getPath().toString()).isEqualTo("/workspace/cycle/BUILD");
   }

   /**
    * Test to detect implicit input/output file overlap in rules.
    */
   @Test
   public void testOneRuleImplicitCycleJava() throws Exception {
     Package pkg =
         createScratchPackageForImplicitCycle(
             "cycle", "java_library(name='jcyc',", "      srcs = ['libjcyc.jar', 'foo.java'])");
     try {
       pkg.getTarget("jcyc");
       fail();
     } catch (NoSuchTargetException e) {
       /* ok */
     }
     assertThat(pkg.containsErrors()).isTrue();
     assertContainsEvent("rule 'jcyc' has file 'libjcyc.jar' as both an" + " input and an output");
   }

   /**
    * Test not to detect implicit input/output file overlap in rules,
    * when coming from a different package.
    */
   @Test
   public void testInputOutputConflictDifferentPackage() throws Exception {
     Package pkg =
         createScratchPackageForImplicitCycle(
             "googledata/xxx",
             "genrule(name='geo',",
             "    srcs = ['//googledata/geo:geo_info.txt'],",
             "    outs = ['geoinfo.txt'],",
             "    cmd = '$(SRCS) > $@')");
     assertThat(pkg.containsErrors()).isFalse();
   }

   @Test
   public void testTwoRuleCycle() throws Exception {
     scratchRule("b", "rule2", "cc_library(name='rule2',", "           deps=['//a:rule1'])");

     checkError(
         "a",
         "rule1",
         "in cc_library rule //a:rule1: cycle in dependency graph:\n"
             + ".-> //a:rule1\n"
             + "|   //b:rule2\n"
             + "`-- //a:rule1",
         "cc_library(name='rule1',",
         "           deps=['//b:rule2'])");
   }

   @Test
   public void testTwoRuleCycle2() throws Exception {
     reporter.removeHandler(failFastHandler); // expect errors
     scratch.file(
         "x/BUILD", "java_library(name='x', deps=['y'])", "java_library(name='y', deps=['x'])");
     getConfiguredTarget("//x");
     assertContainsEvent("in java_library rule //x:x: cycle in dependency graph");
   }

   @Test
   public void testIndirectOneRuleCycle() throws Exception {
     scratchRule(
         "cycle",
         "foo.h",
         "genrule(name = 'foo.h',",
         "      outs = ['bar.h'],",
         "      srcs = ['foo.h'],",
         "      cmd = 'cp $< $@')");
     checkError(
         "main",
         "mygenrule",
         //error message
         selfEdgeMsg("//cycle:foo.h"),
         // Rule
         "genrule(name='mygenrule',",
         "      outs = ['baz.h'],",
         "      srcs = ['//cycle:foo.h'],",
         "      cmd = 'cp $< $@')");
   }

   private String selfEdgeMsg(String label) {
     return label + " [self-edge]";
   }

   // Regression test for: "IllegalStateException in
   // AbstractConfiguredTarget.initialize()".
   // Failure to mark all cycle-forming nodes when there are *two* cycles led to
   // an attempt to initialise a node we'd already visited.
   @Test
   public void testTwoCycles() throws Exception {
     reporter.removeHandler(failFastHandler); // expect errors
     scratch.file(
         "x/BUILD",
         "genrule(name='b', srcs=['c'], tools=['c'], outs=['b.out'], cmd=':')",
         "genrule(name='c', srcs=['b.out'], outs=[], cmd=':')");
     getConfiguredTarget("//x:b"); // doesn't crash!
     assertContainsEvent("cycle in dependency graph");
   }

   @Test
   public void testAspectCycle() throws Exception {
     reporter.removeHandler(failFastHandler);
     scratch.file("x/BUILD",
         "load('//x:x.bzl', 'aspected', 'plain')",
         // Using data= makes the dependency graph clearer because then the aspect does not propagate
         // from aspectdep through a to b (and c)
         "plain(name = 'a', noaspect_deps = [':b'])",
         "aspected(name = 'b', aspect_deps = ['c'])",
         "plain(name = 'c')",
         "plain(name = 'aspectdep', aspect_deps = ['a'])");

     scratch.file(
         "x/x.bzl",
         "def _impl(ctx):",
         "    return []",
         "",
         "rule_aspect = aspect(",
         "    implementation = _impl,",
         "    attr_aspects = ['aspect_deps'],",
         "    attrs = { '_implicit': attr.label(default = Label('//x:aspectdep')) })",
         "",
         "plain = rule(",
         "    implementation = _impl,",
         "    attrs = { 'aspect_deps': attr.label_list(), 'noaspect_deps': attr.label_list() })",
         "",
         "aspected = rule(",
         "    implementation = _impl,",
         "    attrs = { 'aspect_deps': attr.label_list(aspects = [rule_aspect]) })");

     getConfiguredTarget("//x:a");
     assertContainsEvent("cycle in dependency graph");
     assertContainsEvent("//x:c with aspect //x:x.bzl%rule_aspect");
   }

   /** A late bound dependency which depends on the 'dep' label if the 'define' is in --defines. */
   // TODO(b/65746853): provide a way to do this without passing the entire configuration
   private static final LabelLateBoundDefault<BuildConfiguration> LATE_BOUND_DEP =
       LabelLateBoundDefault.fromTargetConfiguration(
           BuildConfiguration.class,
           null,
           (rule, attributes, config) ->
               config.getCommandLineBuildVariables().containsKey(attributes.get("define", STRING))
                   ? attributes.get("dep", NODEP_LABEL)
                   : null);

   /** A rule which always depends on the given label. */
   private static final MockRule NORMAL_DEPENDER =
       () -> MockRule.define("normal_dep", attr("dep", LABEL).allowedFileTypes());

   /** A rule which depends on a given label only if the given define is set. */
   private static final MockRule LATE_BOUND_DEPENDER =
       () ->
           MockRule.define(
               "late_bound_dep",
               attr("define", STRING).mandatory(),
               attr("dep", NODEP_LABEL).mandatory(),
               attr(":late_bound_dep", LABEL).value(LATE_BOUND_DEP));

   /** A rule which removes a define from the configuration of its dependency. */
   private static final MockRule DEFINE_CLEARER =
       () ->
           MockRule.define(
               "define_clearer",
               attr("define", STRING).mandatory(),
               attr("dep", LABEL)
                   .mandatory()
                   .allowedFileTypes()
                   .cfg(
                       new TransitionFactory<AttributeTransitionData>() {
                         @Override
                         public SplitTransition create(AttributeTransitionData data) {
                           return (BuildOptions options) -> {
                             String define = data.attributes().get("define", STRING);
                             BuildOptions newOptions = options.clone();
                             BuildConfiguration.Options optionsFragment =
                                 newOptions.get(BuildConfiguration.Options.class);
                             optionsFragment.commandLineBuildVariables =
                                 optionsFragment.commandLineBuildVariables.stream()
                                     .filter((pair) -> !pair.getKey().equals(define))
                                     .collect(toImmutableList());
                             return ImmutableList.of(newOptions);
                           };
                         }

                         @Override
                         public boolean isSplit() {
                           return true;
                         }
                       }));

   @Override
   protected ConfiguredRuleClassProvider getRuleClassProvider() {
     ConfiguredRuleClassProvider.Builder builder =
         new ConfiguredRuleClassProvider.Builder()
             .addRuleDefinition(NORMAL_DEPENDER)
             .addRuleDefinition(LATE_BOUND_DEPENDER)
             .addRuleDefinition(DEFINE_CLEARER);
     TestRuleClassProvider.addStandardRules(builder);
     return builder.build();
   }

   @Test
   public void testLateBoundTargetCycleNotConfiguredTargetCycle() throws Exception {
     // Target graph: //a -> //b -?> //c -> //a (loop)
     // Configured target graph: //a -> //b -> //c -> //a (2) -> //b (2)
     scratch.file("a/BUILD", "normal_dep(name = 'a', dep = '//b')");
     scratch.file("b/BUILD", "late_bound_dep(name = 'b', dep = '//c', define = 'CYCLE_ON')");
     scratch.file("c/BUILD", "define_clearer(name = 'c', dep = '//a', define = 'CYCLE_ON')");

     useConfiguration("--define=CYCLE_ON=yes");
     getConfiguredTarget("//a");
     assertNoEvents();
   }

   @Test
   public void testSelectTargetCycleNotConfiguredTargetCycle() throws Exception {
     // Target graph: //a -> //b -?> //c -> //a (loop)
     // Configured target graph: //a -> //b -> //c -> //a (2) -> //b (2) -> //b:stop (2)
     scratch.file("a/BUILD", "normal_dep(name = 'a', dep = '//b')");
     scratch.file("b/BUILD",
         "config_setting(name = 'cycle', define_values = {'CYCLE_ON': 'yes'})",
         "normal_dep(name = 'stop')",
         "normal_dep(name = 'b', dep = select({':cycle': '//c', '//conditions:default': ':stop'}))");
     scratch.file("c/BUILD", "define_clearer(name = 'c', dep = '//a', define = 'CYCLE_ON')");

     useConfiguration("--define=CYCLE_ON=yes");
     getConfiguredTarget("//a");
     assertNoEvents();
   }
 }
	// Copyright 2014 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.analysis;

	import static com.google.common.collect.ImmutableList.toImmutableList;
	import static com.google.common.truth.Truth.assertThat;
	import static com.google.devtools.build.lib.packages.Attribute.attr;
	import static com.google.devtools.build.lib.packages.BuildType.LABEL;
	import static com.google.devtools.build.lib.packages.BuildType.NODEP_LABEL;
	import static com.google.devtools.build.lib.syntax.Type.STRING;
	import static org.junit.Assert.fail;

	import com.google.common.collect.ImmutableList;
	import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
	import com.google.devtools.build.lib.analysis.config.BuildOptions;
	import com.google.devtools.build.lib.analysis.config.transitions.SplitTransition;
	import com.google.devtools.build.lib.analysis.config.transitions.TransitionFactory;
	import com.google.devtools.build.lib.analysis.util.BuildViewTestCase;
	import com.google.devtools.build.lib.analysis.util.MockRule;
	import com.google.devtools.build.lib.events.Event;
	import com.google.devtools.build.lib.events.Location;
	import com.google.devtools.build.lib.packages.Attribute.LabelLateBoundDefault;
	import com.google.devtools.build.lib.packages.AttributeTransitionData;
	import com.google.devtools.build.lib.packages.NoSuchTargetException;
	import com.google.devtools.build.lib.packages.Package;
	import com.google.devtools.build.lib.testutil.TestRuleClassProvider;
	import org.junit.Test;
	import org.junit.runner.RunWith;
	import org.junit.runners.JUnit4;

	/**
	* Tests that check that dependency cycles are reported correctly.
	*/
	@RunWith(JUnit4.class)
	public class CircularDependencyTest extends BuildViewTestCase {

	@Test
	public void testOneRuleCycle() throws Exception {
	checkError(
	"cycle",
	"foo.g",
	//error message
	selfEdgeMsg("//cycle:foo.g"),
	// Rule
	"genrule(name = 'foo.g',",
	" outs = ['Foo.java'],",
	" srcs = ['foo.g'],",
	" cmd = 'cat $(SRCS) > $<' )");
	}

	@Test
	public void testDirectPackageGroupCycle() throws Exception {
	checkError(
	"cycle",
	"melon",
	selfEdgeMsg("//cycle:moebius"),
	"package_group(name='moebius', packages=[], includes=['//cycle:moebius'])",
	"sh_library(name='melon', visibility=[':moebius'])");
	}

	@Test
	public void testThreeLongPackageGroupCycle() throws Exception {
	String expectedEvent =
	"cycle in dependency graph:\n"
	+ " //cycle:superman\n"
	+ ".-> //cycle:rock\n"
	+ "\| //cycle:paper\n"
	+ "\| //cycle:scissors\n"
	+ "`-- //cycle:rock";
	checkError(
	"cycle",
	"superman",
	expectedEvent,
	"# dummy line",
	"package_group(name='paper', includes=['//cycle:scissors'])",
	"package_group(name='rock', includes=['//cycle:paper'])",
	"package_group(name='scissors', includes=['//cycle:rock'])",
	"sh_library(name='superman', visibility=[':rock'])");

	Event foundEvent = null;
	for (Event event : eventCollector) {
	if (event.getMessage().contains(expectedEvent)) {
	foundEvent = event;
	break;
	}
	}

	assertThat(foundEvent).isNotNull();
	Location location = foundEvent.getLocation();
	assertThat(location.getStartLineAndColumn().getLine()).isEqualTo(3);
	assertThat(location.getPath().toString()).isEqualTo("/workspace/cycle/BUILD");
	}

	/**
	* Test to detect implicit input/output file overlap in rules.
	*/
	@Test
	public void testOneRuleImplicitCycleJava() throws Exception {
	Package pkg =
	createScratchPackageForImplicitCycle(
	"cycle", "java_library(name='jcyc',", " srcs = ['libjcyc.jar', 'foo.java'])");
	try {
	pkg.getTarget("jcyc");
	fail();
	} catch (NoSuchTargetException e) {
	/* ok */
	}
	assertThat(pkg.containsErrors()).isTrue();
	assertContainsEvent("rule 'jcyc' has file 'libjcyc.jar' as both an" + " input and an output");
	}

	/**
	* Test not to detect implicit input/output file overlap in rules,
	* when coming from a different package.
	*/
	@Test
	public void testInputOutputConflictDifferentPackage() throws Exception {
	Package pkg =
	createScratchPackageForImplicitCycle(
	"googledata/xxx",
	"genrule(name='geo',",
	" srcs = ['//googledata/geo:geo_info.txt'],",
	" outs = ['geoinfo.txt'],",
	" cmd = '$(SRCS) > $@')");
	assertThat(pkg.containsErrors()).isFalse();
	}

	@Test
	public void testTwoRuleCycle() throws Exception {
	scratchRule("b", "rule2", "cc_library(name='rule2',", " deps=['//a:rule1'])");

	checkError(
	"a",
	"rule1",
	"in cc_library rule //a:rule1: cycle in dependency graph:\n"
	+ ".-> //a:rule1\n"
	+ "\| //b:rule2\n"
	+ "`-- //a:rule1",
	"cc_library(name='rule1',",
	" deps=['//b:rule2'])");
	}

	@Test
	public void testTwoRuleCycle2() throws Exception {
	reporter.removeHandler(failFastHandler); // expect errors
	scratch.file(
	"x/BUILD", "java_library(name='x', deps=['y'])", "java_library(name='y', deps=['x'])");
	getConfiguredTarget("//x");
	assertContainsEvent("in java_library rule //x:x: cycle in dependency graph");
	}

	@Test
	public void testIndirectOneRuleCycle() throws Exception {
	scratchRule(
	"cycle",
	"foo.h",
	"genrule(name = 'foo.h',",
	" outs = ['bar.h'],",
	" srcs = ['foo.h'],",
	" cmd = 'cp $< $@')");
	checkError(
	"main",
	"mygenrule",
	//error message
	selfEdgeMsg("//cycle:foo.h"),
	// Rule
	"genrule(name='mygenrule',",
	" outs = ['baz.h'],",
	" srcs = ['//cycle:foo.h'],",
	" cmd = 'cp $< $@')");
	}

	private String selfEdgeMsg(String label) {
	return label + " [self-edge]";
	}

	// Regression test for: "IllegalStateException in
	// AbstractConfiguredTarget.initialize()".
	// Failure to mark all cycle-forming nodes when there are two cycles led to
	// an attempt to initialise a node we'd already visited.
	@Test
	public void testTwoCycles() throws Exception {
	reporter.removeHandler(failFastHandler); // expect errors
	scratch.file(
	"x/BUILD",
	"genrule(name='b', srcs=['c'], tools=['c'], outs=['b.out'], cmd=':')",
	"genrule(name='c', srcs=['b.out'], outs=[], cmd=':')");
	getConfiguredTarget("//x:b"); // doesn't crash!
	assertContainsEvent("cycle in dependency graph");
	}

	@Test
	public void testAspectCycle() throws Exception {
	reporter.removeHandler(failFastHandler);
	scratch.file("x/BUILD",
	"load('//x:x.bzl', 'aspected', 'plain')",
	// Using data= makes the dependency graph clearer because then the aspect does not propagate
	// from aspectdep through a to b (and c)
	"plain(name = 'a', noaspect_deps = [':b'])",
	"aspected(name = 'b', aspect_deps = ['c'])",
	"plain(name = 'c')",
	"plain(name = 'aspectdep', aspect_deps = ['a'])");

	scratch.file(
	"x/x.bzl",
	"def _impl(ctx):",
	" return []",
	"",
	"rule_aspect = aspect(",
	" implementation = _impl,",
	" attr_aspects = ['aspect_deps'],",
	" attrs = { '_implicit': attr.label(default = Label('//x:aspectdep')) })",
	"",
	"plain = rule(",
	" implementation = _impl,",
	" attrs = { 'aspect_deps': attr.label_list(), 'noaspect_deps': attr.label_list() })",
	"",
	"aspected = rule(",
	" implementation = _impl,",
	" attrs = { 'aspect_deps': attr.label_list(aspects = [rule_aspect]) })");

	getConfiguredTarget("//x:a");
	assertContainsEvent("cycle in dependency graph");
	assertContainsEvent("//x:c with aspect //x:x.bzl%rule_aspect");
	}

	/** A late bound dependency which depends on the 'dep' label if the 'define' is in --defines. */
	// TODO(b/65746853): provide a way to do this without passing the entire configuration
	private static final LabelLateBoundDefault<BuildConfiguration> LATE_BOUND_DEP =
	LabelLateBoundDefault.fromTargetConfiguration(
	BuildConfiguration.class,
	null,
	(rule, attributes, config) ->
	config.getCommandLineBuildVariables().containsKey(attributes.get("define", STRING))
	? attributes.get("dep", NODEP_LABEL)
	: null);

	/** A rule which always depends on the given label. */
	private static final MockRule NORMAL_DEPENDER =
	() -> MockRule.define("normal_dep", attr("dep", LABEL).allowedFileTypes());

	/** A rule which depends on a given label only if the given define is set. */
	private static final MockRule LATE_BOUND_DEPENDER =
	() ->
	MockRule.define(
	"late_bound_dep",
	attr("define", STRING).mandatory(),
	attr("dep", NODEP_LABEL).mandatory(),
	attr(":late_bound_dep", LABEL).value(LATE_BOUND_DEP));

	/** A rule which removes a define from the configuration of its dependency. */
	private static final MockRule DEFINE_CLEARER =
	() ->
	MockRule.define(
	"define_clearer",
	attr("define", STRING).mandatory(),
	attr("dep", LABEL)
	.mandatory()
	.allowedFileTypes()
	.cfg(
	new TransitionFactory<AttributeTransitionData>() {
	@Override
	public SplitTransition create(AttributeTransitionData data) {
	return (BuildOptions options) -> {
	String define = data.attributes().get("define", STRING);
	BuildOptions newOptions = options.clone();
	BuildConfiguration.Options optionsFragment =
	newOptions.get(BuildConfiguration.Options.class);
	optionsFragment.commandLineBuildVariables =
	optionsFragment.commandLineBuildVariables.stream()
	.filter((pair) -> !pair.getKey().equals(define))
	.collect(toImmutableList());
	return ImmutableList.of(newOptions);
	};
	}

	@Override
	public boolean isSplit() {
	return true;
	}
	}));

	@Override
	protected ConfiguredRuleClassProvider getRuleClassProvider() {
	ConfiguredRuleClassProvider.Builder builder =
	new ConfiguredRuleClassProvider.Builder()
	.addRuleDefinition(NORMAL_DEPENDER)
	.addRuleDefinition(LATE_BOUND_DEPENDER)
	.addRuleDefinition(DEFINE_CLEARER);
	TestRuleClassProvider.addStandardRules(builder);
	return builder.build();
	}

	@Test
	public void testLateBoundTargetCycleNotConfiguredTargetCycle() throws Exception {
	// Target graph: //a -> //b -?> //c -> //a (loop)
	// Configured target graph: //a -> //b -> //c -> //a (2) -> //b (2)
	scratch.file("a/BUILD", "normal_dep(name = 'a', dep = '//b')");
	scratch.file("b/BUILD", "late_bound_dep(name = 'b', dep = '//c', define = 'CYCLE_ON')");
	scratch.file("c/BUILD", "define_clearer(name = 'c', dep = '//a', define = 'CYCLE_ON')");

	useConfiguration("--define=CYCLE_ON=yes");
	getConfiguredTarget("//a");
	assertNoEvents();
	}

	@Test
	public void testSelectTargetCycleNotConfiguredTargetCycle() throws Exception {
	// Target graph: //a -> //b -?> //c -> //a (loop)
	// Configured target graph: //a -> //b -> //c -> //a (2) -> //b (2) -> //b:stop (2)
	scratch.file("a/BUILD", "normal_dep(name = 'a', dep = '//b')");
	scratch.file("b/BUILD",
	"config_setting(name = 'cycle', define_values = {'CYCLE_ON': 'yes'})",
	"normal_dep(name = 'stop')",
	"normal_dep(name = 'b', dep = select({':cycle': '//c', '//conditions:default': ':stop'}))");
	scratch.file("c/BUILD", "define_clearer(name = 'c', dep = '//a', define = 'CYCLE_ON')");

	useConfiguration("--define=CYCLE_ON=yes");
	getConfiguredTarget("//a");
	assertNoEvents();
	}
	}