make file paths clickable in test output when using go modules

src/goBuild.ts

@@ -126,6 +126,9 @@ export function goBuild(fileUri: vscode.Uri, isMod: boolean, goConfig: vscode.Wo
 	// Find the right importPath instead of directly using `.`. Fixes https://github.com/Microsoft/vscode-go/issues/846
 	let currentGoWorkspace = getCurrentGoWorkspaceFromGOPATH(getCurrentGoPath(), cwd);
 	let importPath = currentGoWorkspace ? cwd.substr(currentGoWorkspace.length + 1) : '.';
+	if (importPath === '') {
+		importPath = currentGoWorkspace;
+	}
 	running = true;
 	return runTool(
 		buildArgs.concat('-o', tmpPath, importPath),

src/goPath.ts

@@ -179,9 +179,22 @@ export function getCurrentGoWorkspaceFromGOPATH(gopath: string, currentFileDirPa
 			}
 		}
 	}
+	// use current root if the package is using go modules outside of GOPATH
+	if (isGoModule(currentFileDirPath)) {
+		currentWorkspace = currentFileDirPath;
+	}
 	return currentWorkspace;
 }
 
+export function isGoModule(modulePath: string): Boolean {
+	try {
+		return fs.statSync(path.join(modulePath, 'go.mod')).isFile();
+	}
+	catch (e) {
+		return false;
+	}
+}
+
 // Workaround for issue in https://github.com/Microsoft/vscode/issues/9448#issuecomment-244804026
 export function fixDriveCasingInWindows(pathToFix: string): string {
 	return (process.platform === 'win32' && pathToFix) ? pathToFix.substr(0, 1).toUpperCase() + pathToFix.substr(1) : pathToFix;

src/testUtils.ts

@@ -7,7 +7,7 @@ import cp = require('child_process');
 import path = require('path');
 import vscode = require('vscode');
 import util = require('util');
-import { parseEnvFile, getCurrentGoWorkspaceFromGOPATH } from './goPath';
+import { parseEnvFile, getCurrentGoWorkspaceFromGOPATH, isGoModule } from './goPath';
 import { getToolsEnvVars, getGoVersion, LineBuffer, SemVersion, resolvePath, getCurrentGoPath, getBinPath } from './util';
 import { GoDocumentSymbolProvider } from './goOutline';
 import { getNonVendorPackages } from './goPackages';
@@ -229,7 +229,8 @@ export function goTest(testconfig: TestConfig): Thenable<boolean> {
 				const result = line.match(packageResultLineRE);
 				if (result && currentGoWorkspace) {
 					const packageNameArr = result[2].split('/');
-					const baseDir = path.join(currentGoWorkspace, ...packageNameArr);
+
+					const baseDir = isGoModule(currentGoWorkspace) ? currentGoWorkspace : path.join(currentGoWorkspace, ...packageNameArr);
 					testResultLines.forEach(line => outputChannel.appendLine(expandFilePathInOutput(line, baseDir)));
 					testResultLines.splice(0);
 				}