pass <package> to dlv test/debug if applicable

src/debugAdapter/goDebug.ts

@@ -219,6 +219,13 @@ 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 {
@@ -231,9 +238,9 @@ class Delve {
 
 			// If 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 && (mode === 'debug' || mode === 'test')) {
-				env['GOPATH'] = getInferredGopath(isProgramDirectory ? program : path.dirname(program));
+				env['GOPATH'] = getInferredGopath(dirname);
 			}
 
 			if (!!launchArgs.noDebug) {
@@ -280,6 +287,8 @@ 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

@@ -123,6 +123,11 @@ 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) {