/*

 * Copyright (c) 2015, 2016, 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

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 * questions.

 */

/*

 * @test 8080069 8152925

 * @summary Test of Snippet redefinition and replacement.

 * @build KullaTesting TestingInputStream

 * @run testng ReplaceTest

 */

import java.util.Collection;

import java.util.List;

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 jdk.jshell.SnippetEvent;

import jdk.jshell.UnresolvedReferenceException;

import static org.testng.Assert.assertEquals;

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

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

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));

        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));

        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));

        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));

        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));

        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));

        DeclarationSnippet 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_DEFINED)));

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

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

                added(VALID),

                ste(a, RECOVERABLE_DEFINED, VALID, false, 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_DEFINED, false, MAIN_SNIPPET));

        assertUnresolvedDependencies(a, 0);

        assertActiveKeys();

    }

    public void testForwardVarToClassGeneric() {

        DeclarationSnippet a = classKey(assertEval("class A<T> { final T x; A(T v) { this.x = v; } ; T get() { return x; } int core() { return g; } }", added(RECOVERABLE_DEFINED)));

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

        List<SnippetEvent> events = assertEval("A<String> as = new A<>(\"hi\");", null,

                UnresolvedReferenceException.class, DiagCheck.DIAG_OK, DiagCheck.DIAG_OK, null);

        SnippetEvent ste = events.get(0);

        Snippet assn = ste.snippet();

        DeclarationSnippet unsn = ((UnresolvedReferenceException) ste.exception()).getSnippet();

        assertEquals(unsn.name(), "A", "Wrong with unresolved");

        assertEquals(getState().unresolvedDependencies(unsn).size(), 1, "Wrong size unresolved");

        assertEquals(getState().diagnostics(unsn).size(), 0, "Expected no diagnostics");

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

                added(VALID),

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

        assertEval("A<String> as = new A<>(\"low\");",

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

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

        assertEval("as.get();", "\"low\"");

        assertUnresolvedDependencies(a, 0);

        assertActiveKeys();

    }

   public void testForwardVarToClassExtendsImplements() {

        DeclarationSnippet ik = classKey(assertEval("interface I { default int ii() { return 1; } }", added(VALID)));

        DeclarationSnippet jk = classKey(assertEval("interface J { default int jj() { return 2; } }", added(VALID)));

        DeclarationSnippet ck = classKey(assertEval("class C { int cc() { return 3; } }", added(VALID)));

        DeclarationSnippet dk = classKey(assertEval("class D extends C implements I,J { int dd() { return g; } }", added(RECOVERABLE_DEFINED)));

        DeclarationSnippet ek = classKey(assertEval("class E extends D { int ee() { return 5; } }", added(VALID)));

        assertUnresolvedDependencies1(dk, RECOVERABLE_DEFINED, "variable g");

        assertEvalUnresolvedException("new D();", "D", 1, 0);

        assertEvalUnresolvedException("new E();", "D", 1, 0);

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

                added(VALID),

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

        assertEval("E e = new E();");

        assertDrop(g,

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

                ste(dk, VALID, RECOVERABLE_DEFINED, false, g));

        assertEvalUnresolvedException("new D();", "D", 1, 0);

        assertEvalUnresolvedException("new E();", "D", 1, 0);

        assertEval("e.ee();", "5");

        assertEvalUnresolvedException("e.dd();", "D", 1, 0);

        assertEval("e.cc();", "3");

        assertEval("e.jj();", "2");

        assertEval("e.ii();", "1");

        assertActiveKeys();

    }

    public void testForwardVarToInterface() {

        DeclarationSnippet i = classKey(assertEval("interface I { default int f() { return x; } }", added(RECOVERABLE_DEFINED)));

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

        DeclarationSnippet c = classKey(assertEval("class C implements I { int z() { return 2; } }", added(VALID)));

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

        assertEval("c.z();", "2");

        assertEvalUnresolvedException("c.f()", "I", 1, 0);

        Snippet g = varKey(assertEval("int x = 55;", "55",

                added(VALID),

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

        assertEval("c.f();", "55");

        assertUnresolvedDependencies(i, 0);

        assertActiveKeys();

    }

    public void testForwardVarToEnum() {

        DeclarationSnippet a = classKey(assertEval("enum E { Q, W, E; float ff() { return fff; } }", added(RECOVERABLE_DEFINED)));

        assertUnresolvedDependencies1(a, RECOVERABLE_DEFINED, "variable fff");

        Snippet g = varKey(assertEval("float fff = 4.5f;", "4.5",

                added(VALID),

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

        assertEval("E.Q.ff();", "4.5");

        assertEval("double fff = 3.3;", "3.3", 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_DEFINED, false, MAIN_SNIPPET));

        assertUnresolvedDependencies(a, 0);

        assertActiveKeys();

    }

    public void testForwardMethodToClass() {

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

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

        assertEval("A foo() { return null; }");

        assertEvalUnresolvedException("new A();", "A", 1, 0);

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

                added(VALID),

                ste(a, RECOVERABLE_DEFINED, VALID, false, 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_DEFINED, false, 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_DEFINED, true, MAIN_SNIPPET));

        assertEvalUnresolvedException("new A().b;", "A", 0, 1);

        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; }",