Bug 76792 organize imports: not correct: 0 import(s) added. [code manipulation]
Organize imports falsely sums up the total of added and removed imports to display a difference. 0 import(s) added. means that the total of added and removed imports is 0. It would be better if it told the user something like: 1 import(s) removed, 1 import(s) added. The status message is slightly more useful than you might think at first glance, as in the odd case that it does not work (which I can't reproduce) you want to notice this, and a useful status message helps.
org.eclipse.jdt.ui.tests/ui/org/eclipse/jdt/ui/tests/core/ImportOrganizeTest.java
String[] order= new String[0];
		IChooseImportQuery query= createQuery("C", new String[] {}, new int[] {});
	
		OrganizeImportsOperation op= new OrganizeImportsOperation(cu, order, 99, false, true, true, query);
		op.run(null);
		
		buf= new StringBuffer();
		buf.append("import java.util.Vector;\n");
		buf.append("\n");						
		buf.append("public class C extends Vector {\n");
		buf.append("}\n");	
		assertEqualString(cu.getSource(), buf.toString());
	}
	
	public void testReplaceImportsNoPackage() throws Exception {
		IPackageFragmentRoot sourceFolder= JavaProjectHelper.addSourceContainer(fJProject1, "src");
		IPackageFragment pack1= sourceFolder.getPackageFragment("");
		StringBuffer buf= new StringBuffer();
		buf.append("import java.util.Set;\n");
		buf.append("\n");				
		buf.append("public class C extends Vector {\n");
		buf.append("}\n");	
		ICompilationUnit cu= pack1.createCompilationUnit("C.java", buf.toString(), false, null);
		
		
		String[] order= new String[0];
		IChooseImportQuery query= createQuery("C", new String[] {}, new int[] {});