r194226 - Adds the ability to inject a DiagnosticConsumer into ClangTools.

[Peter Collingbourne]

On Thu, Nov 07, 2013 at 11:18:05PM -0000, Manuel Klimek wrote:
> +TEST(ClangToolTest, InjectDiagnosticConsumer) {
> +  FixedCompilationDatabase Compilations("/", std::vector<std::string>());
> +  ClangTool Tool(Compilations, std::vector<std::string>(1, "/a.cc"));
> +  Tool.mapVirtualFile("/a.cc", "int x = undeclared;");
> +  TestDiagnosticConsumer Consumer;
> +  Tool.setDiagnosticConsumer(&Consumer);
> +  Tool.run(newFrontendActionFactory<SyntaxOnlyAction>());
> +  EXPECT_EQ(1u, Consumer.NumDiagnosticsSeen);
> +}

Should this also be testing buildASTs?  (I guess you could use a #warning
directive in order to ensure ASTUnit returns an AST).

Thanks,
-- 
Peter