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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* 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.intellij.codeInspection
import com.intellij.codeInspection.dataFlow.ContractInference
import com.intellij.testFramework.fixtures.LightCodeInsightFixtureTestCase
/**
* @author peter
*/
class ContractInferenceFromSourceTest extends LightCodeInsightFixtureTestCase {
void "test if null return null"() {
def c = inferContract("""
String smth(String s) {
if (s == null) return null;
return s.substring(1);
}
""")
assert c == 'null -> null'
}
void "test if not null return true"() {
def c = inferContract("""
boolean smth(int a, String s) {
if (s != null) { return true; }
return a == 2;
}
""")
assert c == '_, !null -> true'
}
void "test if null fail"() {
def c = inferContract("""
boolean smth(int a, String s) {
if (null == s) { throw new RuntimeException(); }
return a == 2;
}
""")
assert c == '_, null -> fail'
}
void "test if true return the same"() {
def c = inferContract("""
boolean smth(boolean b, int a) {
if (b) return b;
return a == 2;
}
""")
assert c == 'true, _ -> true'
}
void "test if false return negation"() {
def c = inferContract("""
boolean smth(boolean b, int a) {
if (!b) return !(b);
return a == 2;
}
""")
assert c == 'false, _ -> true'
}
void "test nested if"() {
def c = inferContract("""
boolean smth(boolean b, Object o) {
if (!b) if (o != null) return true;
return a == 2;
}
""")
assert c == 'false, !null -> true'
}
void "test conjunction"() {
def c = inferContract("""
boolean smth(boolean b, Object o) {
if (!b && o != null) return true;
return a == 2;
}
""")
assert c == 'false, !null -> true'
}
void "test disjunction"() {
def c = inferContracts("""
boolean smth(boolean b, Object o) {
if (!b || o != null) return true;
return a == 2;
}
""")
assert c == ['false, _ -> true', 'true, !null -> true']
}
void "test ternary"() {
def c = inferContracts("""
boolean smth(boolean b, Object o, Object o1) {
return (!b || o != null) ? true : (o1 != null && o1.hashCode() == 3);
}
""")
assert c == ['false, _, _ -> true', 'true, !null, _ -> true', 'true, null, null -> false']
}
void "test instanceof"() {
def c = inferContracts("""
boolean smth(Object o) {
return o instanceof String;
}
""")
assert c == ['null -> false']
}
void "test if-else"() {
def c = inferContracts("""
boolean smth(Object o) {
if (o instanceof String) return false;
else return true;
}
""")
assert c == ['null -> true']
}
void "test if return without else"() {
def c = inferContracts("""
boolean smth(Object o) {
if (o instanceof String) return false;
return true;
}
""")
assert c == ['null -> true']
}
void "test if no-return without else"() {
def c = inferContracts("""
boolean smth(Object o) {
if (o instanceof String) callSomething();
return true;
}
""")
assert c == []
}
void "test assertion"() {
def c = inferContracts("""
boolean smth(Object o) {
assert o instanceof String;
return true;
}
""")
assert c == ['null -> fail']
}
void "_test no NotNull duplication"() {
def c = inferContracts("""
boolean smth(@org.jetbrains.annotations.NotNull Object o) {
if (o == null) throw new RuntimeException();
return o.hashCode() == 1;
}
""")
assert c == []
}
private String inferContract(String method) {
return assertOneElement(inferContracts(method))
}
private List<String> inferContracts(String method) {
def clazz = myFixture.addClass("class Foo { $method }")
return ContractInference.inferContracts(clazz.methods[0]).collect { it as String }
}
}
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