Added test for multiple files in rootDir

Author: nametake

handler_test.go

@@ -108,6 +108,34 @@ func TestLangHandler_lint_Integration(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "multiple files in rootDir",
+			h: &langHandler{
+				logger:  newStdLogger(false),
+				command: []string{"golangci-lint", "run", "--out-format", "json", "--issues-exit-code=1"},
+				rootDir: filepath.Dir("./testdata/multifile"),
+			},
+			filePath: "./testdata/multifile/bar.go",
+			want: []Diagnostic{
+				{
+					Range: Range{
+						Start: Position{
+							Line:      3,
+							Character: 4,
+						},
+						End: Position{
+							Line:      3,
+							Character: 4,
+						},
+					},
+					Severity:           DSWarning,
+					Code:               nil,
+					Source:             pt("unused"),
+					Message:            "unused: var `bar` is unused",
+					RelatedInformation: nil,
+				},
+			},
+		},
 	}
 
 	for _, tt := range tests {

testdata/multifile/bar.go

@@ -0,0 +1,4 @@
+package main
+
+// unused: var `bar` is unused
+var bar = "bar"

testdata/multifile/main.go

@@ -0,0 +1,4 @@
+package main
+
+// unused: var `foo` is unused
+var foo = "foo"