Add component exit to tests

This makes it possible to detect successful test runs in a general way.

repos/base/src/test/reconstructible/main.cc

@@ -83,7 +83,7 @@ struct Main
 	void call_const_method(Compound const &compound) {
 		compound.member->reference.const_method(); }
 
-	Main(Env &)
+	Main(Env &env)
 	{
 		log("--- Reconstructible utility test ---");
 		{
@@ -132,6 +132,7 @@ struct Main
 			log("got exception, as expected"); }
 
 		log("--- Reconstructible utility test finished ---");
+		env.parent().exit(0);
 	}
 };
 

repos/base/src/test/synced_interface/main.cc

@@ -41,12 +41,13 @@ struct Main
 	Adder                                adder { };
 	Synced_interface<Adder, Pseudo_lock> synced_adder { lock, &adder };
 
-	Main(Env &)
+	Main(Env &env)
 	{
 		log("--- Synced interface test ---");
 		int const res = synced_adder()->add(13, 14);
 		log("result is ", res);
 		log("--- Synced interface test finished ---");
+		env.parent().exit(0);
 	}
 };
 

repos/libports/src/test/timed_semaphore/main.cc

@@ -77,6 +77,7 @@ struct Main
 		test.construct(env, false, 1, "without timeouts"); test.destruct();
 		test.construct(env, true,  2, "with timeouts");    test.destruct();
 		log("--- Timed semaphore test finished ---");
+		env.parent().exit(0);
 	}
 };
 

repos/os/src/test/fb_bench/main.cc

@@ -143,6 +143,7 @@ struct Main
 		test_3.construct(env, 3); test_3.destruct();
 		test_4.construct(env, 4); test_4.destruct();
 		log("--- Framebuffer benchmark finished ---");
+		env.parent().exit(0);
 	}
 };
 

repos/os/src/test/pci/test.cc

@@ -92,4 +92,5 @@ void Component::construct(Genode::Env &env)
 	pci.release_device(prev_device_cap);
 
 	log("--- Platform test finished ---");
+	env.parent().exit(0);
 }

repos/os/src/test/ram_fs_chunk/main.cc

@@ -119,6 +119,7 @@ struct Main
 		}
 		log("allocator: sum=", alloc.sum);
 		log("--- RAM filesystem chunk test finished ---");
+		env.parent().exit(0);
 	}
 
 	void write(Chunk_level_0 &chunk, char const *str, off_t seek_offset)

repos/os/src/test/rom_block/main.cc

@@ -72,6 +72,7 @@ struct Main
 			src.release_packet(pkt);
 		}
 		log("--- ROM Block test finished ---");
+		env.parent().exit(0);
 	}
 };
 

repos/os/src/test/signal/main.cc

@@ -693,6 +693,7 @@ struct Main
 	{
 		test_8.destruct();
 		log("--- Signalling test finished ---");
+		env.parent().exit(0);
 	}
 
 	Main(Env &env) : env(env)