/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/*

 * @test

 * @summary Test of Snippet redefinition and replacement.

 * @build KullaTesting TestingInputStream

 * @run testng ReplaceTest

 */

import java.util.Collection;

import jdk.jshell.Snippet;

import jdk.jshell.MethodSnippet;

import jdk.jshell.PersistentSnippet;

import jdk.jshell.TypeDeclSnippet;

import jdk.jshell.VarSnippet;

import jdk.jshell.DeclarationSnippet;

import org.testng.annotations.Test;

import static jdk.jshell.Snippet.Status.*;

import static jdk.jshell.Snippet.SubKind.*;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertTrue;

@Test

public class ReplaceTest extends KullaTesting {

    public void testRedefine() {

        Snippet vx = varKey(assertEval("int x;"));

        Snippet mu = methodKey(assertEval("int mu() { return x * 4; }"));

        Snippet c = classKey(assertEval("class C { String v() { return \"#\" + mu(); } }"));

        assertEval("C c0  = new C();");

        assertEval("c0.v();", "\"#0\"");

        assertEval("int x = 10;", "10",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(vx, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertEval("c0.v();", "\"#40\"");

        assertEval("C c = new C();");

        assertEval("c.v();", "\"#40\"");

        assertEval("int mu() { return x * 3; }",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(mu, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertEval("c.v();", "\"#30\"");

        assertEval("class C { String v() { return \"@\" + mu(); } }",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(c, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertEval("c0.v();", "\"@30\"");

        assertEval("c = new C();");

        assertEval("c.v();", "\"@30\"");

        assertActiveKeys();

    }

    public void testReplaceClassToVar() {

        Snippet oldA = classKey(assertEval("class A { public String toString() { return \"old\"; } }"));

        Snippet v = varKey(assertEval("A a = new A();", "old"));

        assertEval("a;", "old");

        Snippet midA = classKey(assertEval("class A { public String toString() { return \"middle\"; } }",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(oldA, VALID, OVERWRITTEN, false, MAIN_SNIPPET)));

        assertEval("a;", "middle");

        assertEval("class A { int x; public String toString() { return \"new\"; } }",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(midA, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(v, VALID, VALID, true, MAIN_SNIPPET));

        assertEval("a;", "null");

        assertActiveKeys();

    }

    public void testReplaceVarToMethod() {

        Snippet x = varKey(assertEval("int x;"));

        Snippet musn = methodKey(assertEval("double mu() { return x * 4; }"));

        assertEval("x == 0;", "true");

        assertEval("mu() == 0.0;", "true");

        assertEval("double x = 2.5;",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(x, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(musn, VALID, VALID, false, MAIN_SNIPPET));

        Collection<MethodSnippet> meths = getState().methods();

        assertEquals(meths.size(), 1);

        assertTrue(musn == meths.iterator().next(), "Identity must not change");

        assertEval("x == 2.5;", "true");

        assertEval("mu() == 10.0;", "true");  // Auto redefine

        assertActiveKeys();

    }

    public void testReplaceMethodToMethod() {

        Snippet a = methodKey(assertEval("double a() { return 2; }"));

        Snippet b = methodKey(assertEval("double b() { return a() * 10; }"));

        assertEval("double c() { return b() * 3; }");

        assertEval("double d() { return c() + 1000; }");

        assertEval("d();", "1060.0");

        assertEval("int a() { return 5; }",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(a, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(b, VALID, VALID, false, MAIN_SNIPPET));

        assertEval("d();", "1150.0");

        assertActiveKeys();

    }

    public void testReplaceClassToMethod() {

        Snippet c = classKey(assertEval("class C { int f() { return 7; } }"));

        Snippet m = methodKey(assertEval("int m() { return new C().f(); }"));

        assertEval("m();", "7");

        assertEval("class C { int x = 99; int f() { return x; } }",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(c, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(m, VALID, VALID, false, MAIN_SNIPPET));

        assertEval("m();", "99");

        assertActiveKeys();

    }

    public void testReplaceVarToClass() {

        Snippet x = varKey(assertEval("int x;"));

        Snippet c = classKey(assertEval("class A { double a = 4 * x; }"));

        assertEval("x == 0;", "true");

        assertEval("new A().a == 0.0;", "true");

        assertEval("double x = 2.5;",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(x, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(c, VALID, VALID, false, MAIN_SNIPPET));

        Collection<TypeDeclSnippet> classes = getState().types();

        assertEquals(classes.size(), 1);

        assertTrue(c == classes.iterator().next(), "Identity must not change");

        assertEval("x == 2.5;", "true");

        assertEval("new A().a == 10.0;", "true");

        assertActiveKeys();

    }

    public void testReplaceMethodToClass() {

        Snippet x = methodKey(assertEval("int x() { return 0; }"));

        Snippet c = classKey(assertEval("class A { double a = 4 * x(); }"));

        assertEval("x() == 0;", "true");

        assertEval("new A().a == 0.0;", "true");

        assertEval("double x() { return 2.5; }",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(x, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(c, VALID, VALID, false, MAIN_SNIPPET));

        assertEval("x();", "2.5");

        Collection<TypeDeclSnippet> classes = getState().types();

        assertEquals(classes.size(), 1);

        assertTrue(c == classes.iterator().next(), "Identity must not change");

        assertEval("x() == 2.5;", "true");

        assertEval("new A().a == 10.0;", "true");

        assertActiveKeys();

    }

    public void testReplaceClassToClass() {

        TypeDeclSnippet a = classKey(assertEval("class A {}"));

        assertTypeDeclSnippet(a, "A", VALID, CLASS_SUBKIND, 0, 0);

        TypeDeclSnippet b = classKey(assertEval("class B extends A {}"));

        TypeDeclSnippet c = classKey(assertEval("class C extends B {}"));

        TypeDeclSnippet d = classKey(assertEval("class D extends C {}"));

        assertEval("class A { int x; public String toString() { return \"NEW\"; } }",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(a, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(b, VALID, VALID, true, MAIN_SNIPPET),

                ste(c, VALID, VALID, true, b),

                ste(d, VALID, VALID, true, c));

        assertTypeDeclSnippet(b, "B", VALID, CLASS_SUBKIND, 0, 0);

        assertTypeDeclSnippet(c, "C", VALID, CLASS_SUBKIND, 0, 0);

        assertTypeDeclSnippet(d, "D", VALID, CLASS_SUBKIND, 0, 0);

        assertEval("new D();", "NEW");

        assertActiveKeys();

    }

    public void testOverwriteReplaceMethod() {

        MethodSnippet k1 = methodKey(assertEval("String m(Integer i) { return i.toString(); }"));

        MethodSnippet k2 = methodKey(assertEval("String m(java.lang.Integer i) { return \"java.lang.\" + i.toString(); }",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(k1, VALID, OVERWRITTEN, false, MAIN_SNIPPET)));

        assertMethodDeclSnippet(k1, "m", "(Integer)String", OVERWRITTEN, 0, 0);

        assertEval("m(6);", "\"java.lang.6\"");

        assertEval("String m(Integer i) { return i.toString(); }",

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(k2, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertMethodDeclSnippet(k2, "m", "(java.lang.Integer)String", OVERWRITTEN, 0, 0);

        assertEval("m(6);", "\"6\"");

        assertActiveKeys();

    }

    public void testOverwriteMethodForwardReferenceClass() {

        Snippet k1 = methodKey(assertEval("int q(Boo b) { return b.x; }",

                added(RECOVERABLE_NOT_DEFINED)));

        assertUnresolvedDependencies1((MethodSnippet) k1, RECOVERABLE_NOT_DEFINED, "class Boo");

        assertEval("class Boo { int x = 55; }",

                added(VALID),

                ste(k1, RECOVERABLE_NOT_DEFINED, VALID, true, null));

        assertMethodDeclSnippet((MethodSnippet) k1, "q", "(Boo)int", VALID, 0, 0);

        assertEval("q(new Boo());", "55");

        assertActiveKeys();

    }

    public void testOverwriteMethodForwardReferenceClassImport() {

        MethodSnippet k1 = methodKey(assertEval("int ff(List lis) { return lis.size(); }",

                added(RECOVERABLE_NOT_DEFINED)));

        assertUnresolvedDependencies1(k1, RECOVERABLE_NOT_DEFINED, "class List");

        assertEval("import java.util.*;",

                added(VALID),

                ste(k1, RECOVERABLE_NOT_DEFINED, VALID, true, null));

        assertMethodDeclSnippet(k1, "ff", "(List)int", VALID, 0, 0);

        assertEval("ff(new ArrayList());", "0");

        assertActiveKeys();

    }

    public void testForwardVarToMethod() {

        DeclarationSnippet t = methodKey(assertEval("int t() { return x; }", added(RECOVERABLE_DEFINED)));

        assertUnresolvedDependencies1(t, RECOVERABLE_DEFINED, "variable x");

        assertEvalUnresolvedException("t();", "t", 1, 0);

        Snippet x = varKey(assertEval("int x = 33;", "33",

                added(VALID),

                ste(t, RECOVERABLE_DEFINED, VALID, false, null)));

        assertEval("t();", "33");

        assertEval("double x = 0.88;",

                "0.88", null,

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(x, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(t, VALID, RECOVERABLE_DEFINED, false, MAIN_SNIPPET));

        assertEvalUnresolvedException("t();", "t", 0, 1);

        assertActiveKeys();

    }

    public void testForwardMethodToMethod() {

        Snippet t = methodKey(assertEval("int t() { return f(); }", added(RECOVERABLE_DEFINED)));

        Snippet f = methodKey(assertEval("int f() { return g(); }",

                added(RECOVERABLE_DEFINED),

                ste(t, RECOVERABLE_DEFINED, VALID, false, null)));

        assertUnresolvedDependencies1((DeclarationSnippet) f, RECOVERABLE_DEFINED, "method g()");

        assertEvalUnresolvedException("t();", "f", 1, 0);

        Snippet g = methodKey(assertEval("int g() { return 55; }",

                added(VALID),

                ste(f, RECOVERABLE_DEFINED, VALID, false, null)));

        assertEval("t();", "55");

        assertEval("double g() { return 3.14159; }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(g, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(f, VALID, RECOVERABLE_DEFINED, false, MAIN_SNIPPET));

        MethodSnippet exsn = assertEvalUnresolvedException("t();", "f", 0, 1);

        assertTrue(exsn == f, "Identity must not change");

        assertActiveKeys();

    }

    public void testForwardClassToMethod() {

        DeclarationSnippet t = methodKey(assertEval("int t() { return new A().f(); }", added(RECOVERABLE_DEFINED)));

        assertUnresolvedDependencies1(t, RECOVERABLE_DEFINED, "class A");

        assertEvalUnresolvedException("t();", "t", 1, 0);

        Snippet a = classKey(assertEval(

                "class A {\n" +

                        "   int f() { return 10; }\n" +

                "}",

                added(VALID),

                ste(t, RECOVERABLE_DEFINED, VALID, false, null)));

        assertEval("t();", "10");

        assertEval(

                "class A {\n" +

                "   double f() { return 88.0; }\n" +

                "}",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(a, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(t, VALID, RECOVERABLE_DEFINED, false, MAIN_SNIPPET));

        assertEvalUnresolvedException("t();", "t", 0, 1);

        assertActiveKeys();

    }

    public void testForwardVarToClass() {

        DeclarationSnippet a = classKey(assertEval("class A { int f() { return g; } }", added(RECOVERABLE_NOT_DEFINED)));

        assertUnresolvedDependencies1(a, RECOVERABLE_NOT_DEFINED, "variable g");

        Snippet g = varKey(assertEval("int g = 10;", "10",

                added(VALID),

                ste(a, RECOVERABLE_NOT_DEFINED, VALID, true, null)));

        assertEval("new A().f();", "10");

        assertEval("double g = 10;", "10.0", null,

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(g, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(a, VALID, RECOVERABLE_NOT_DEFINED, true, MAIN_SNIPPET));

        assertUnresolvedDependencies(a, 0);

        assertActiveKeys();

    }

    public void testForwardMethodToClass() {

        DeclarationSnippet a = classKey(assertEval("class A { int f() { return g(); } }", added(RECOVERABLE_NOT_DEFINED)));

        assertUnresolvedDependencies1(a, RECOVERABLE_NOT_DEFINED, "method g()");

        Snippet g = methodKey(assertEval("int g() { return 10; }",

                added(VALID),

                ste(a, RECOVERABLE_NOT_DEFINED, VALID, true, null)));

        assertEval("new A().f();", "10");

        assertEval("double g() { return 10; }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(g, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(a, VALID, RECOVERABLE_NOT_DEFINED, true, MAIN_SNIPPET));

        assertUnresolvedDependencies(a, 0);

        assertActiveKeys();

    }

    public void testForwardClassToClass1() {

        Snippet a = classKey(assertEval("class A { B b = new B(); }", added(RECOVERABLE_NOT_DEFINED)));

        assertDeclareFail("new A().b;", "compiler.err.cant.resolve.location");

        Snippet b = classKey(assertEval("class B { public String toString() { return \"B\"; } }",

                added(VALID),

                ste(a, RECOVERABLE_NOT_DEFINED, VALID, true, null)));

        assertEval("new A().b;", "B");

        assertEval("interface B { }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(b, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(a, VALID, RECOVERABLE_NOT_DEFINED, true, MAIN_SNIPPET));

        assertDeclareFail("new A().b;", "compiler.err.cant.resolve.location");

        assertActiveKeys();

    }

    public void testForwardClassToClass2() {

        Snippet a = classKey(assertEval("class A extends B { }", added(RECOVERABLE_NOT_DEFINED)));

        assertDeclareFail("new A();", "compiler.err.cant.resolve.location");

        Snippet b = classKey(assertEval("class B { public String toString() { return \"B\"; } }",

                added(VALID),

                ste(a, RECOVERABLE_NOT_DEFINED, VALID, true, null)));

        assertEval("new A();", "B");

        assertEval("interface B { }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(b, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(a, VALID, RECOVERABLE_NOT_DEFINED, true, MAIN_SNIPPET));

        assertDeclareFail("new A();", "compiler.err.cant.resolve.location");

        assertActiveKeys();

    }

    public void testForwardClassToClass3() {

        Snippet a = classKey(assertEval("interface A extends B { static int f() { return 10; } }", added(RECOVERABLE_NOT_DEFINED)));

        assertDeclareFail("A.f();", "compiler.err.cant.resolve.location");

        Snippet b = classKey(assertEval("interface B { }",

                added(VALID),

                ste(a, RECOVERABLE_NOT_DEFINED, VALID, true, null)));

        assertEval("A.f();", "10");

        assertEval("class B { }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                ste(MAIN_SNIPPET, VALID, VALID, true, null),

                ste(b, VALID, OVERWRITTEN, false, MAIN_SNIPPET),

                ste(a, VALID, RECOVERABLE_NOT_DEFINED, true, MAIN_SNIPPET));

        assertDeclareFail("A.f();", "compiler.err.cant.resolve.location");

        assertActiveKeys();

    }

    public void testImportDeclare() {

        Snippet singleImport = importKey(assertEval("import java.util.List;", added(VALID)));

        Snippet importOnDemand = importKey(assertEval("import java.util.*;", added(VALID)));

        Snippet singleStaticImport = importKey(assertEval("import static java.lang.Math.abs;", added(VALID)));

        Snippet staticImportOnDemand = importKey(assertEval("import static java.lang.Math.*;", added(VALID)));

        assertEval("import java.util.List; //again",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(singleImport, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertEval("import java.util.*; //again",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(importOnDemand, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertEval("import static java.lang.Math.abs; //again",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(singleStaticImport, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertEval("import static java.lang.Math.*; //again",

                ste(MAIN_SNIPPET, VALID, VALID, false, null),

                ste(staticImportOnDemand, VALID, OVERWRITTEN, false, MAIN_SNIPPET));

        assertActiveKeys();

    }

    public void testForwardVariable() {

        assertEval("int f() { return x; }", added(RECOVERABLE_DEFINED));

        assertEvalUnresolvedException("f();", "f", 1, 0);

        assertActiveKeys();

    }

    public void testLocalClassInUnresolved() {

        Snippet f = methodKey(assertEval("void f() { class A {} g(); }", added(RECOVERABLE_DEFINED)));

        assertEval("void g() {}",

                added(VALID),

                ste(f, RECOVERABLE_DEFINED, VALID, false, null));

        assertEval("f();", "");

    }

    @Test(enabled = false) // TODO 8129420

    public void testLocalClassEvolve() {

        Snippet j = methodKey(assertEval("Object j() { return null; }", added(VALID)));

        assertEval("Object j() { class B {}; return null; }",

                ste(MAIN_SNIPPET, VALID, VALID, false, null));

        assertEval("Object j() { class B {}; return new B(); }",

                ste(MAIN_SNIPPET, VALID, VALID, false, null));

        assertEval("j().getClass().getSimpleName();", "\"B\"");

        assertEval("Object j() { class B { int p; public String toString() { return \"Yep\";} }; return new B(); }",

                ste(MAIN_SNIPPET, VALID, VALID, false, null));

        assertEval("j().getClass().getSimpleName();", "\"B\"");

        assertEval("j();", "Yep");

    }

    public void testForwardSingleImportMethodToMethod() {

        DeclarationSnippet string = methodKey(assertEval("String string() { return format(\"string\"); }",

                added(RECOVERABLE_DEFINED)));

        assertUnresolvedDependencies1(string, RECOVERABLE_DEFINED, "method format(java.lang.String)");

        assertEvalUnresolvedException("string();", "string", 1, 0);

        assertEval("import static java.lang.String.format;",

                added(VALID),

                ste(string, RECOVERABLE_DEFINED, VALID, false, null));

        assertEval("string();", "\"string\"");

        assertEval("double format(String s) { return 0; }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                added(VALID),

                ste(string, VALID, RECOVERABLE_DEFINED, false, null));

        assertEvalUnresolvedException("string();", "string", 0, 1);

        assertActiveKeys();

    }

    public void testForwardImportMethodOnDemandToMethod() {

        DeclarationSnippet string = methodKey(assertEval("String string() { return format(\"string\"); }",

                added(RECOVERABLE_DEFINED)));

        assertUnresolvedDependencies1(string, RECOVERABLE_DEFINED, "method format(java.lang.String)");

        assertEvalUnresolvedException("string();", "string", 1, 0);

        assertEval("import static java.lang.String.*;",

                added(VALID),

                ste(string, RECOVERABLE_DEFINED, VALID, false, null));

        assertEval("string();", "\"string\"");

        assertEval("double format(String s) { return 0; }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                added(VALID),

                ste(string, VALID, RECOVERABLE_DEFINED, false, null));

        assertEvalUnresolvedException("string();", "string", 0, 1);

        assertActiveKeys();

    }

    public void testForwardSingleImportFieldToMethod() {

        DeclarationSnippet pi = methodKey(assertEval("double pi() { return PI; }",

                added(RECOVERABLE_DEFINED)));

        assertUnresolvedDependencies1(pi, RECOVERABLE_DEFINED, "variable PI");

        assertEvalUnresolvedException("pi();", "pi", 1, 0);

        assertEval("import static java.lang.Math.PI;",

                added(VALID),

                ste(pi, RECOVERABLE_DEFINED, VALID, false, null));

        assertEval("Math.abs(pi() - 3.1415) < 0.001;", "true");

        assertEval("String PI;",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                added(VALID),

                ste(pi, VALID, RECOVERABLE_DEFINED, false, null));

        assertEvalUnresolvedException("pi();", "pi", 0, 1);

        assertActiveKeys();

    }

    public void testForwardImportFieldOnDemandToMethod() {

        DeclarationSnippet pi = methodKey(assertEval("double pi() { return PI; }",

                added(RECOVERABLE_DEFINED)));

        assertUnresolvedDependencies1(pi, RECOVERABLE_DEFINED, "variable PI");

        assertEvalUnresolvedException("pi();", "pi", 1, 0);

        assertEval("import static java.lang.Math.*;",

                added(VALID),

                ste(pi, RECOVERABLE_DEFINED, VALID, false, MAIN_SNIPPET));

        assertEval("Math.abs(pi() - 3.1415) < 0.001;", "true");

        assertEval("String PI;",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                added(VALID),

                ste(pi, VALID, RECOVERABLE_DEFINED, false, MAIN_SNIPPET));

        assertEvalUnresolvedException("pi();", "pi", 0, 1);

        assertActiveKeys();

    }

    public void testForwardSingleImportMethodToClass1() {

        PersistentSnippet a = classKey(assertEval("class A { String s = format(\"%d\", 10); }",

                added(RECOVERABLE_NOT_DEFINED)));

        assertDeclareFail("new A();", "compiler.err.cant.resolve.location");

        assertEval("import static java.lang.String.format;",

                added(VALID),

                ste(a, RECOVERABLE_NOT_DEFINED, VALID, true, null));

        assertEval("new A().s;", "\"10\"");

        PersistentSnippet format = methodKey(assertEval("void format(String s, int d) { }",

                DiagCheck.DIAG_OK,

                DiagCheck.DIAG_ERROR,

                added(VALID),

                ste(a, VALID, RECOVERABLE_NOT_DEFINED, true, MAIN_SNIPPET)));

        assertDeclareFail("new A().s;", "compiler.err.cant.resolve.location");

        assertActiveKeys();

        assertDrop(format,

                ste(format, VALID, DROPPED, true, null),

                ste(a, RECOVERABLE_NOT_DEFINED, VALID, true, format));

    }

    public void testForwardSingleImportMethodToClass2() {

        PersistentSnippet a = classKey(assertEval("class A { String s() { return format(\"%d\", 10); } }",

                added(RECOVERABLE_NOT_DEFINED)));

        assertDeclareFail("new A();", "compiler.err.cant.resolve.location");

        assertEval("import static java.lang.String.format;",