-cov option ignored?

[drkameleon]

I'm building a project with dub and no-matter-what I cannot get 
the compiler to output Code Coverage information. This is my 
dub.json. What am I doing wrong?

{
	"authors": [
		"drkameleon"
	],
	"buildTypes": {
		"profile": {
			"buildOptions": [
				"debugInfo",
				"inline",
				"optimize",
				"profile",
				"profileGC",
				"noBoundsCheck",
				"ignoreUnknownPragmas",
				"coverage",
				"warnings"
			],
			"dflags-dmd": [
				"-J source/resources"
			],
			"dflags-ldc": [
				"-J=source/resources",
				"-flto=full",
				"-O5",
				"-Os",
				"-Oz",
				"-fprofile-instr-generate",
				"-fdmd-trace-functions"
			],
			"lflags-dmd": [
				"-lcurl",
				"-lsqlite3"
			],
			"lflags-ldc": [
				"-lcurl",
				"-lsqlite3"
			]
		},
		"release": {
			"buildOptions": [
				"releaseMode",
				"inline",
				"optimize",
				"noBoundsCheck",
				"ignoreUnknownPragmas"
			],
			"dflags-dmd": [
				"-J source/resources"
			],
			"dflags-ldc": [
				"-J=source/resources",
				"-flto=full",
				"-O5",
				"-Os",
				"-Oz",
				"-mcpu=native"
			],
			"lflags-dmd": [
				"-lcurl"
			],
			"lflags-ldc": [
				"-lcurl"
			]
		}
	},
	"configurations": [
		{
			"name": "application",
			"targetType": "executable",
			"versions": ["GTK","SQLITE"],
			"dependencies": {
				"gtk-d": "~>3.9.0"
			},
			"lflags-dmd": [
				"-lsqlite3"
			],
			"lflags-ldc": [
				"-lsqlite3"
			]
		},
		{
			"name": "light",
			"targetType": "executable"
		},
		{
			"name": "library",
			"targetType": "staticLibrary"
		}
	],
	"copyright": "Copyright © 2019, Yanis Zafirópulos (aka 
Dr.Kameleon)",
	"dependencies": {
		"dmarkdown": "~>0.3.0",
		"dxml": "~>0.4.1",
		"dyaml": "~>0.8.0",
		"emsi_containers": "~>0.7.0",
		"urld": "~>2.1.1",
		"vibe-d:inet": "~>0.8.6"
	},
	"description": "Simple, modern and powerful interpreted 
programming language for super-fast scripting",
	"homepage": "http://arturo-lang.io",
	"license": "MIT",
	"name": "arturo",
	"postBuildCommands": [
		"strip arturo"
	],
	"preBuildCommands": [
		"scripts/make_parser.sh",
		"scripts/update_build.sh"
	],
	"sourceFiles": [
		"obj/lexer.o",
		"obj/parser.o"
	]
}