diff --git a/examples/test-3.hmdl.json b/examples/test-3.hmdl.json
index 64edf2d..9f21d03 100644
--- a/examples/test-3.hmdl.json
+++ b/examples/test-3.hmdl.json
@@ -1,24 +1,10 @@
 {
-	"defaults": {
-		"threshold": 1,
-		"schedule": {
-			"regular_interval": 10,
-			"attentive_interval": 1
-		},
-		"notifications": [
-			{
-				"kind": "console",
-				"parameters": {
-				}
-			}
-		]
-	},
 	"checks": [
 		{
 			"name": "test",
 			"kind": "generic_remote",
 			"parameters": {
-				"ssh_host": "bragi.pool.greenscale.de",
+				"host": "bragi.pool.greenscale.de",
 				"ssh_user": "fenris",
 				"ssh_port": 8192,
 				"ssh_key": "/home/fenris/.ssh/keypairs/gs-bragi"
diff --git a/examples/test.hmdl.json b/examples/test.hmdl.json
index b1eea19..0b5f1fc 100644
--- a/examples/test.hmdl.json
+++ b/examples/test.hmdl.json
@@ -4,6 +4,7 @@
 			"regular_interval": 10,
 			"attentive_interval": 1
 		},
+		"threshold": 1,
 		"notifications": [
 			{
 				"kind": "console",
diff --git a/source/logic/checks/generic_remote.py b/source/logic/checks/generic_remote.py
index abb0df2..22a022f 100644
--- a/source/logic/checks/generic_remote.py
+++ b/source/logic/checks/generic_remote.py
@@ -8,7 +8,7 @@ class implementation_check_kind_generic_remote(interface_check_kind):
 			"type": "object",
 			"additionalProperties": False,
 			"properties": {
-				"ssh_host" : {
+				"host" : {
 					"type" : "string"
 				},
 				"ssh_port": {
@@ -38,7 +38,7 @@ class implementation_check_kind_generic_remote(interface_check_kind):
 				}
 			},
 			"required": [
-				"ssh_host"
+				"host"
 			]
 		}
 		
@@ -47,8 +47,8 @@ class implementation_check_kind_generic_remote(interface_check_kind):
 	[implementation]
 	'''
 	def normalize_conf_node(self, node):
-		if (not "ssh_host" in node):
-			raise ValueError("mandatory parameter \"ssh_host\" missing")
+		if (not "host" in node):
+			raise ValueError("mandatory parameter \"host\" missing")
 		else:
 			return dict_merge(
 				{
@@ -78,7 +78,7 @@ class implementation_check_kind_generic_remote(interface_check_kind):
 		if True:
 			outer_command_parts.append("ssh");
 		if True:
-			outer_command_parts.append(string_coin("{{host}}", {"host": parameters["ssh_host"]}));
+			outer_command_parts.append(string_coin("{{host}}", {"host": parameters["host"]}));
 		if (parameters["ssh_port"] is not None):
 			outer_command_parts.append(string_coin("-p {{port}}", {"port": ("%u" % parameters["ssh_port"])}));
 		if (parameters["ssh_user"] is not None):
@@ -104,8 +104,8 @@ class implementation_check_kind_generic_remote(interface_check_kind):
 			stuff = result["stdout"].split("\n")[-2].split(" ")
 			data = {
 				"device": stuff[0],
-				"used": stuff[2],
-				"avail": stuff[3],
+				"used": int(stuff[2]),
+				"avail": int(stuff[3]),
 				"perc": int(stuff[4][:-1]),
 			}
 			if (data["perc"] > parameters["threshold"]):
@@ -116,12 +116,14 @@ class implementation_check_kind_generic_remote(interface_check_kind):
 						enum_condition.warning
 					),
 					"info": {
-						"ssh_host": parameters["ssh_host"],
-						"mount_point": parameters["mount_point"],
-						"device": data["device"],
-						"used": data["used"], # ToDo: Humanlesbarkeit herstellen
-						"available": data["avail"], # ToDo: Humanlesbarkeit herstellen
-						"percentage": (str(data["perc"]) + "%"),
+						"data": {
+							"host": parameters["host"],
+							"device": data["device"],
+							"mount_point": parameters["mount_point"],
+							"used": format_bytes(data["used"]),
+							"available": format_bytes(data["avail"]),
+							"percentage": (str(data["perc"]) + "%"),
+						},
 						"faults": [
 							translation_get("checks.generic_remote.overflow")
 						],
diff --git a/source/logic/conf.py b/source/logic/conf.py
index b8a76d2..3bb50f3 100644
--- a/source/logic/conf.py
+++ b/source/logic/conf.py
@@ -309,8 +309,8 @@ def conf_normalize_check(
 					node__["annoy"] = node_["annoy"]
 				if ("schedule" in node_):
 					node__["schedule"] = conf_normalize_schedule(node_["schedule"])
-				if ("notification" in node_):
-					node__["notification"] = list(
+				if ("notifications" in node_):
+					node__["notifications"] = list(
 						map(
 							lambda x: conf_normalize_notification(notification_channel_implementations, x),
 							node_["notifications"]
diff --git a/source/logic/lib.py b/source/logic/lib.py
index fb686c6..de3d928 100644
--- a/source/logic/lib.py
+++ b/source/logic/lib.py
@@ -60,3 +60,26 @@ def shell_command(command):
 		"stderr": result.stderr.decode(),
 	}
 	
+
+def format_bytes(bytes_):
+	units = [
+		{"label": "B", "digits": 0},
+		{"label": "KB", "digits": 1},
+		{"label": "MB", "digits": 1},
+		{"label": "GB", "digits": 1},
+		{"label": "TB", "digits": 1},
+		{"label": "PB", "digits": 1},
+	]
+	number = bytes_
+	index = 0
+	while ((number >= 1000) and (index < (len(units) - 1))):
+		number /= 1000
+		index += 1
+	return (
+		("%." + ("%u" % units[index]["digits"]) + "f %s")
+		% (
+			number,
+			units[index]["label"],
+		)
+	)
+	
diff --git a/source/logic/main.py b/source/logic/main.py
index 51bed75..705447f 100644
--- a/source/logic/main.py
+++ b/source/logic/main.py
@@ -107,7 +107,7 @@ def main():
 		"script": implementation_check_kind_script(),
 		"file_state": implementation_check_kind_file_state(),
 		"http_request": implementation_check_kind_http_request(),
-        "generic_remote" : implementation_check_kind_generic_remote()
+		"generic_remote" : implementation_check_kind_generic_remote(),
 	}
 	
 	### load notification channel implementations
diff --git a/source/test/test.py b/source/test/test.py
new file mode 100644
index 0000000..6f5048d
--- /dev/null
+++ b/source/test/test.py
@@ -0,0 +1,102 @@
+definitions = [
+	{
+		"name": "lib.string_coin",
+		"procedure": lambda input_: string_coin(input_["template"], input_["arguments"]),
+		"cases": [
+			{
+				"input": {
+					"template": "{{sachen}} sind {{farbe}}",
+					"arguments": {
+						"farbe": "rot",
+					},
+				},
+				"output": "{{sachen}} sind rot"
+			},
+			{
+				"input": {
+					"template": "{{sachen}} sind {{farbe}}",
+					"arguments": {
+					},
+				},
+				"output": "{{sachen}} sind {{farbe}}"
+			},
+			{
+				"input": {
+					"template": "{{sachen}} sind {{farbe}}",
+					"arguments": {
+						"sachen": "rosen",
+						"farbe": "rot",
+					},
+				},
+				"output": "rosen sind rot"
+			},
+			{
+				"input": {
+					"template": "{{sachen}} sind {{farbe}}",
+					"arguments": {
+						"sachen": "rosen",
+						"farbe": "rot",
+						"ort": "frankreich",
+					},
+				},
+				"output": "rosen sind rot"
+			},
+		],
+	},
+	{
+		"name": "lib.format_bytes",
+		"procedure": lambda input_: format_bytes(input_),
+		"cases": [
+			{
+				"input": 999,
+				"output": "999 B",
+			},
+			{
+				"input": 1000,
+				"output": "1.0 KB",
+			},
+			{
+				"input": 1000000,
+				"output": "1.0 MB",
+			},
+			{
+				"input": 1000000000,
+				"output": "1.0 GB",
+			},
+			{
+				"input": 1000000000000,
+				"output": "1.0 TB",
+			},
+			{
+				"input": 1000000000000000,
+				"output": "1.0 PB",
+			},
+			{
+				"input": 1000000000000000000,
+				"output": "1000.0 PB",
+			},
+		],
+	},
+]
+
+
+for definition in definitions:
+	for index in range(len(definition["cases"])):
+		case = definition["cases"][index]
+		output_actual = definition["procedure"](case["input"])
+		output_expected = case["output"]
+		passed = (output_actual == output_expected)
+		info = {
+			"input": case["input"],
+			"output_expected": output_expected,
+			"output_actual": output_actual,
+		}
+		_sys.stderr.write(
+			"[%s] %s.%u%s\n"
+			% (
+				("+" if passed else "x"),
+				definition["name"],
+				index,
+				("" if passed else (": " + _json.dumps(info))),
+			)
+		)
diff --git a/tools/build b/tools/build
index 511564f..621c89f 100755
--- a/tools/build
+++ b/tools/build
@@ -4,6 +4,7 @@ import sys as _sys
 import os as _os
 import json as _json
 import stat as _stat
+import argparse as _argparse
 
 
 def file_read(path):
@@ -34,24 +35,62 @@ def main():
 	## consts
 	dir_source = "source"
 	dir_build = "build"
-	sources_logic = [
-		_os.path.join(dir_source, "logic", "packages.py"),
-		_os.path.join(dir_source, "logic", "lib.py"),
-		_os.path.join(dir_source, "logic", "localization.py"),
-		_os.path.join(dir_source, "logic", "condition.py"),
-		_os.path.join(dir_source, "logic", "conf.py"),
-		_os.path.join(dir_source, "logic", "checks", "_interface.py"),
-		_os.path.join(dir_source, "logic", "checks", "script.py"),
-		_os.path.join(dir_source, "logic", "checks", "file_state.py"),
-		_os.path.join(dir_source, "logic", "checks", "http_request.py"),
-		_os.path.join(dir_source, "logic", "checks", "generic_remote.py"),
-		_os.path.join(dir_source, "logic", "channels", "_interface.py"),
-		_os.path.join(dir_source, "logic", "channels", "console.py"),
-		_os.path.join(dir_source, "logic", "channels", "email.py"),
-		_os.path.join(dir_source, "logic", "channels", "libnotify.py"),
-		_os.path.join(dir_source, "logic", "main.py"),
-	]
-	path_compilation = _os.path.join(dir_build, "heimdall")
+	targets = {
+		"app": {
+			"sources": [
+				_os.path.join(dir_source, "logic", "packages.py"),
+				_os.path.join(dir_source, "logic", "lib.py"),
+				_os.path.join(dir_source, "logic", "localization.py"),
+				_os.path.join(dir_source, "logic", "condition.py"),
+				_os.path.join(dir_source, "logic", "conf.py"),
+				_os.path.join(dir_source, "logic", "checks", "_interface.py"),
+				_os.path.join(dir_source, "logic", "checks", "script.py"),
+				_os.path.join(dir_source, "logic", "checks", "file_state.py"),
+				_os.path.join(dir_source, "logic", "checks", "http_request.py"),
+				_os.path.join(dir_source, "logic", "checks", "generic_remote.py"),
+				_os.path.join(dir_source, "logic", "channels", "_interface.py"),
+				_os.path.join(dir_source, "logic", "channels", "console.py"),
+				_os.path.join(dir_source, "logic", "channels", "email.py"),
+				_os.path.join(dir_source, "logic", "channels", "libnotify.py"),
+				_os.path.join(dir_source, "logic", "main.py"),
+			],
+			"build": _os.path.join(dir_build, "heimdall"),
+		},
+		"test": {
+			"sources": [
+				_os.path.join(dir_source, "logic", "packages.py"),
+				_os.path.join(dir_source, "logic", "lib.py"),
+				_os.path.join(dir_source, "logic", "localization.py"),
+				_os.path.join(dir_source, "logic", "condition.py"),
+				_os.path.join(dir_source, "logic", "conf.py"),
+				_os.path.join(dir_source, "logic", "checks", "_interface.py"),
+				_os.path.join(dir_source, "logic", "checks", "script.py"),
+				_os.path.join(dir_source, "logic", "checks", "file_state.py"),
+				_os.path.join(dir_source, "logic", "checks", "http_request.py"),
+				_os.path.join(dir_source, "logic", "checks", "generic_remote.py"),
+				_os.path.join(dir_source, "logic", "channels", "_interface.py"),
+				_os.path.join(dir_source, "logic", "channels", "console.py"),
+				_os.path.join(dir_source, "logic", "channels", "email.py"),
+				_os.path.join(dir_source, "logic", "channels", "libnotify.py"),
+				_os.path.join(dir_source, "test", "test.py"),
+			],
+			"build": _os.path.join(dir_build, "heimdall-test"),
+		},
+	}
+	
+	## args
+	argument_parser = _argparse.ArgumentParser(
+	)
+	argument_parser.add_argument(
+		"-t",
+		"--target",
+		type = str,
+		choices = ["app", "test"],
+		default = "app",
+		dest = "target_name",
+		help = "which target to build",
+	)
+	args = argument_parser.parse_args()
 	
 	## exec
 	if (not _os.path.exists(dir_build)):
@@ -82,17 +121,17 @@ def main():
 		)
 	
 	### logic
-	for path in sources_logic:
+	for path in targets[args.target_name]["sources"]:
 		compilation += (file_read(path) + "\n")
 	
 	### write to file
-	if _os.path.exists(path_compilation):
-		_os.remove(path_compilation)
-	file_write(path_compilation, compilation)
+	if _os.path.exists(targets[args.target_name]["build"]):
+		_os.remove(targets[args.target_name]["build"])
+	file_write(targets[args.target_name]["build"], compilation)
 	
 	### postproess
 	_os.chmod(
-		path_compilation,
+		targets[args.target_name]["build"],
 		(_stat.S_IRWXU | _stat.S_IXGRP | _stat.S_IXOTH)
 	)