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// 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;
import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import com.google.common.collect.Sets;
import com.google.devtools.build.lib.syntax.util.EvaluationTestCase;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests of Environment.
*/
@RunWith(JUnit4.class)
public class EnvironmentTest extends EvaluationTestCase {
@Override
public Environment newEnvironment() {
return newBuildEnvironment();
}
// Test the API directly
@Test
public void testLookupAndUpdate() throws Exception {
try {
lookup("foo");
fail();
} catch (Environment.NoSuchVariableException e) {
assertThat(e).hasMessage("no such variable: foo");
}
update("foo", "bar");
assertEquals("bar", lookup("foo"));
}
@Test
public void testLookupWithDefault() throws Exception {
assertEquals(21, getEnvironment().lookup("VERSION", 21));
update("VERSION", 42);
assertEquals(42, getEnvironment().lookup("VERSION", 21));
}
@Test
public void testDoubleUpdateSucceeds() throws Exception {
update("VERSION", 42);
assertEquals(42, lookup("VERSION"));
update("VERSION", 43);
assertEquals(43, lookup("VERSION"));
}
// Test assign through interpreter, lookup through API:
@Test
public void testAssign() throws Exception {
try {
lookup("foo");
fail();
} catch (Environment.NoSuchVariableException e) {
assertThat(e).hasMessage("no such variable: foo");
}
eval("foo = 'bar'");
assertEquals("bar", lookup("foo"));
}
// Test update through API, reference through interpreter:
@Test
public void testReference() throws Exception {
try {
eval("foo");
fail();
} catch (EvalException e) {
assertThat(e).hasMessage("name 'foo' is not defined");
}
update("foo", "bar");
assertEquals("bar", eval("foo"));
}
// Test assign and reference through interpreter:
@Test
public void testAssignAndReference() throws Exception {
try {
eval("foo");
fail();
} catch (EvalException e) {
assertThat(e).hasMessage("name 'foo' is not defined");
}
eval("foo = 'bar'");
assertEquals("bar", eval("foo"));
}
@Test
public void testGetVariableNames() throws Exception {
Environment outerEnv;
Environment innerEnv;
try (Mutability mut = Mutability.create("outer")) {
outerEnv = Environment.builder(mut)
.setGlobals(Environment.BUILD).build()
.update("foo", "bar")
.update("wiz", 3);
}
try (Mutability mut = Mutability.create("inner")) {
innerEnv = Environment.builder(mut)
.setGlobals(outerEnv.getGlobals()).build()
.update("foo", "bat")
.update("quux", 42);
}
assertEquals(Sets.newHashSet("foo", "wiz",
"False", "None", "True",
"-", "bool", "dict", "enumerate", "int", "len", "list",
"range", "repr", "select", "sorted", "str", "zip"),
outerEnv.getVariableNames());
assertEquals(Sets.newHashSet("foo", "wiz", "quux",
"False", "None", "True",
"-", "bool", "dict", "enumerate", "int", "len", "list",
"range", "repr", "select", "sorted", "str", "zip"),
innerEnv.getVariableNames());
}
@Test
public void testToString() throws Exception {
update("subject", new StringLiteral("Hello, 'world'.", '\''));
update("from", new StringLiteral("Java", '"'));
assertThat(getEnvironment().toString()).isEqualTo("<Environment[test]>");
}
@Test
public void testBindToNullThrowsException() throws Exception {
try {
update("some_name", null);
fail();
} catch (NullPointerException e) {
assertThat(e).hasMessage("update(value == null)");
}
}
@Test
public void testFrozen() throws Exception {
Environment env;
try (Mutability mutability = Mutability.create("testFrozen")) {
env = Environment.builder(mutability)
.setGlobals(Environment.BUILD).setEventHandler(Environment.FAIL_FAST_HANDLER).build();
env.update("x", 1);
assertEquals(env.lookup("x"), 1);
env.update("y", 2);
assertEquals(env.lookup("y"), 2);
assertEquals(env.lookup("x"), 1);
env.update("x", 3);
assertEquals(env.lookup("x"), 3);
}
try {
// This update to an existing variable should fail because the environment was frozen.
env.update("x", 4);
throw new Exception("failed to fail"); // not an AssertionError like fail()
} catch (AssertionError e) {
assertThat(e).hasMessage("Can't update x to 4 in frozen environment");
}
try {
// This update to a new variable should also fail because the environment was frozen.
env.update("newvar", 5);
throw new Exception("failed to fail"); // not an AssertionError like fail()
} catch (AssertionError e) {
assertThat(e).hasMessage("Can't update newvar to 5 in frozen environment");
}
}
@Test
public void testReadOnly() throws Exception {
Environment env = newSkylarkEnvironment()
.setup("special_var", 42)
.update("global_var", 666);
// We don't even get a runtime exception trying to modify these,
// because we get compile-time exceptions even before we reach runtime!
try {
env.eval("special_var = 41");
throw new AssertionError("failed to fail");
} catch (IllegalArgumentException e) {
assertThat(e).hasMessage("ERROR 1:1: Variable special_var is read only");
}
try {
env.eval("def foo(x): x += global_var; global_var = 36; return x", "foo(1)");
throw new AssertionError("failed to fail");
} catch (EvalExceptionWithStackTrace e) {
assertThat(e.getMessage()).contains("Variable 'global_var' is referenced before assignment. "
+ "The variable is defined in the global scope.");
}
}
}
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