pass <package> to dlv test/debug if applicable

src/debugAdapter/goDebug.ts

@@ -220,6 +220,13 @@ class Delve {
 				return reject('The program attribute must point to valid directory, .go file or executable.');
 			}
 
+			// get the package information
+			let pkgname = '';
+			let dirname = isProgramDirectory ? program : path.dirname(program);
+			if (process.env['GOPATH'] !== '' && dirname.startsWith(process.env['GOPATH'])) {
+				pkgname = dirname.substr(process.env['GOPATH'].length + 5);
+			}
+
 			// read env from disk and merge into env variables
 			let fileEnv = {};
 			try {
@@ -233,9 +240,9 @@ class Delve {
 			if (!fileEnv['GOPATH'] && !launchArgsEnv['GOPATH'] && (mode === 'debug' || mode === 'test')) {
 				// If user hasnt specified GOPATH & file/package to debug is not under env['GOPATH'], then infer it from the file/package path
 				// Not applicable to exec mode in which case `program` need not point to source code under GOPATH
-				let programNotUnderGopath = !env['GOPATH'] || !getCurrentGoWorkspaceFromGOPATH(env['GOPATH'], isProgramDirectory ? program : path.dirname(program));
+				let programNotUnderGopath = !env['GOPATH'] || !getCurrentGoWorkspaceFromGOPATH(env['GOPATH'], dirname);
 				if (programNotUnderGopath ) {
-					env['GOPATH'] = getInferredGopath(isProgramDirectory ? program : path.dirname(program)) || env['GOPATH'];
+					env['GOPATH'] = getInferredGopath(dirname) || env['GOPATH'];
 				}
 			}
 
@@ -285,6 +292,8 @@ class Delve {
 			let dlvArgs = [mode || 'debug'];
 			if (mode === 'exec') {
 				dlvArgs = dlvArgs.concat([program]);
+			} else if (pkgname !== '') {
+				dlvArgs = dlvArgs.concat([pkgname]);
 			}
 			dlvArgs = dlvArgs.concat(['--headless=true', '--listen=' + host + ':' + port.toString()]);
 			if (launchArgs.showLog) {

src/testUtils.ts

@@ -127,6 +127,11 @@ export function goTest(testconfig: TestConfig): Thenable<boolean> {
 			return Promise.resolve();
 		}
 
+		// append the package name to args if applicable
+		if (process.env['GOPATH'] !== '' && testconfig.dir.startsWith(process.env['GOPATH'])) {
+			args.push(testconfig.dir.substr(process.env['GOPATH'].length + 5));
+		}
+
 		targetArgs(testconfig).then(targets => {
 			let outTargets = args.slice(0);
 			if (targets.length > 2) {