add setting to apply test coverage when single test file is run (#2884)

package.json

@@ -883,6 +883,11 @@
           "default": false,
           "description": "If true, shows test coverage when Go: Test Function at cursor command is run."
         },
+        "go.coverOnSingleTestFile": {
+          "type": "boolean",
+          "default": false,
+          "description": "If true, shows test coverage when Go: Test Single File command is run."
+        },
         "go.coverageOptions": {
           "type": "string",
           "enum": [

src/goTest.ts

@@ -195,6 +195,7 @@ export function testCurrentFile(goConfig: vscode.WorkspaceConfiguration, isBench
 		return;
 	}
 
+	const { tmpCoverPath, testFlags } = makeCoverData(goConfig, 'coverOnSingleTestFile', args);
 	const getFunctions = isBenchmark ? getBenchmarkFunctions : getTestFunctions;
 
 	return editor.document.save().then(() => {
@@ -202,7 +203,7 @@ export function testCurrentFile(goConfig: vscode.WorkspaceConfiguration, isBench
 			const testConfig: TestConfig = {
 				goConfig,
 				dir: path.dirname(editor.document.fileName),
-				flags: getTestFlags(goConfig, args),
+				flags: testFlags,
 				functions: testFunctions.map(sym => sym.name),
 				isBenchmark,
 			};
@@ -211,7 +212,14 @@ export function testCurrentFile(goConfig: vscode.WorkspaceConfiguration, isBench
 
 			return isModSupported(editor.document.uri).then(isMod => {
 				testConfig.isMod = isMod;
-				return goTest(testConfig);
+				return goTest(testConfig).then(success => {
+					if (tmpCoverPath) {
+						applyCodeCoverageToAllEditors(tmpCoverPath, testConfig.dir);
+					}
+					return Promise.resolve(success);
+				}, err => {
+					console.log(err);
+				});
 			});
 		});
 	}).then(null, err => {