core: move tests

jadx-core/src/test/java/jadx/tests/JadxClasspathTest.java → jadx-core/src/test/java/jadx/tests/functional/JadxClasspathTest.java

-package jadx.tests;
+package jadx.tests.functional;
 
 import jadx.core.clsp.ClspGraph;
 import jadx.core.dex.instructions.args.ArgType;

jadx-core/src/test/java/jadx/tests/StringUtilsTest.java → jadx-core/src/test/java/jadx/tests/functional/StringUtilsTest.java

-package jadx.tests;
+package jadx.tests.functional;
 
 import jadx.core.utils.StringUtils;
 

jadx-core/src/test/java/jadx/tests/TypeMergeTest.java → jadx-core/src/test/java/jadx/tests/functional/TypeMergeTest.java

-package jadx.tests;
+package jadx.tests.functional;
 
 import jadx.core.clsp.ClspGraph;
 import jadx.core.dex.instructions.args.ArgType;

jadx-core/src/test/java/jadx/api/TestDuplicateCast.java → jadx-core/src/test/java/jadx/tests/internal/TestDuplicateCast.java

-package jadx.api;
+package jadx.tests.internal;
 
+import jadx.api.InternalJadxTest;
 import jadx.core.dex.instructions.InsnType;
 import jadx.core.dex.instructions.args.InsnWrapArg;
 import jadx.core.dex.nodes.ClassNode;

jadx-core/src/test/java/jadx/api/TestFieldIncrement.java → jadx-core/src/test/java/jadx/tests/internal/TestFieldIncrement.java

-package jadx.api;
+package jadx.tests.internal;
 
+import jadx.api.InternalJadxTest;
 import jadx.core.dex.instructions.ArithNode;
 import jadx.core.dex.instructions.ArithOp;
 import jadx.core.dex.instructions.InsnType;

jadx-core/src/test/java/jadx/api/TestStringBuilderElimination.java → jadx-core/src/test/java/jadx/tests/internal/TestStringBuilderElimination.java

-package jadx.api;
+package jadx.tests.internal;
 
+import jadx.api.InternalJadxTest;
 import jadx.core.dex.nodes.ClassNode;
 
 import org.junit.Test;