config/module: adjust FileDetector tests for Windows

"/foo" is not an absolute path on Windows. Adjust the FileDetector
tests to take that into account when verifying the results.

Fixes FileDetector test failures on Windows.

config/module/detect_file.go

@@ -13,8 +13,6 @@ func (d *FileDetector) Detect(src, pwd string) (string, bool, error) {
 		return "", false, nil
 	}
 
-	// Make sure we're using "/" even on Windows. URLs are "/"-based.
-	src = filepath.ToSlash(src)
 	if !filepath.IsAbs(src) {
 		if pwd == "" {
 			return "", true, fmt.Errorf(
@@ -23,6 +21,8 @@ func (d *FileDetector) Detect(src, pwd string) (string, bool, error) {
 
 		src = filepath.Join(pwd, src)
 	}
+	// Make sure we're using "/" even on Windows. URLs are "/"-based.
+	src = filepath.ToSlash(src)
 
 	// Make sure that we don't start with "/" since we add that below
 	if src[0] == '/' {

config/module/detect_file_test.go

@@ -1,25 +1,42 @@
 package module
 
 import (
+	"runtime"
 	"testing"
 )
 
+type fileTest struct {
+	in, pwd, out string
+	err          bool
+}
+
+var fileTests = []fileTest{
+	{"./foo", "/pwd", "file:///pwd/foo", false},
+	{"./foo?foo=bar", "/pwd", "file:///pwd/foo?foo=bar", false},
+	{"foo", "/pwd", "file:///pwd/foo", false},
+}
+
+var unixFileTests = []fileTest{
+	{"/foo", "/pwd", "file:///foo", false},
+	{"/foo?bar=baz", "/pwd", "file:///foo?bar=baz", false},
+}
+
+var winFileTests = []fileTest{
+	{"/foo", "/pwd", "file:///pwd/foo", false},
+	{`C:\`, `/pwd`, `file:///C:/`, false},
+	{`C:\?bar=baz`, `/pwd`, `file:///C:/?bar=baz`, false},
+}
+
 func TestFileDetector(t *testing.T) {
-	cases := []struct {
-		Input  string
-		Output string
-	}{
-		{"./foo", "file:///pwd/foo"},
-		{"./foo?foo=bar", "file:///pwd/foo?foo=bar"},
-		{"foo", "file:///pwd/foo"},
-		{"/foo", "file:///foo"},
-		{"/foo?bar=baz", "file:///foo?bar=baz"},
+	if runtime.GOOS == "windows" {
+		fileTests = append(fileTests, winFileTests...)
+	} else {
+		fileTests = append(fileTests, unixFileTests...)
 	}
 
-	pwd := "/pwd"
 	f := new(FileDetector)
-	for i, tc := range cases {
-		output, ok, err := f.Detect(tc.Input, pwd)
+	for i, tc := range fileTests {
+		out, ok, err := f.Detect(tc.in, tc.pwd)
 		if err != nil {
 			t.Fatalf("err: %s", err)
 		}
@@ -27,36 +44,45 @@ func TestFileDetector(t *testing.T) {
 			t.Fatal("not ok")
 		}
 
-		if output != tc.Output {
-			t.Fatalf("%d: bad: %#v", i, output)
+		if out != tc.out {
+			t.Fatalf("%d: bad: %#v", i, out)
 		}
 	}
 }
 
+var noPwdFileTests = []fileTest{
+	{in: "./foo", pwd: "", out: "", err: true},
+	{in: "foo", pwd: "", out: "", err: true},
+}
+
+var noPwdUnixFileTests = []fileTest{
+	{in: "/foo", pwd: "", out: "file:///foo", err: false},
+}
+
+var noPwdWinFileTests = []fileTest{
+	{in: "/foo", pwd: "", out: "", err: true},
+	{in: `C:\`, pwd: ``, out: `file:///C:/`, err: false},
+}
+
 func TestFileDetector_noPwd(t *testing.T) {
-	cases := []struct {
-		Input  string
-		Output string
-		Err    bool
-	}{
-		{"./foo", "", true},
-		{"foo", "", true},
-		{"/foo", "file:///foo", false},
+	if runtime.GOOS == "windows" {
+		noPwdFileTests = append(noPwdFileTests, noPwdWinFileTests...)
+	} else {
+		noPwdFileTests = append(noPwdFileTests, noPwdUnixFileTests...)
 	}
 
-	pwd := ""
 	f := new(FileDetector)
-	for i, tc := range cases {
-		output, ok, err := f.Detect(tc.Input, pwd)
-		if (err != nil) != tc.Err {
+	for i, tc := range noPwdFileTests {
+		out, ok, err := f.Detect(tc.in, tc.pwd)
+		if (err != nil) != tc.err {
 			t.Fatalf("%d: err: %s", i, err)
 		}
 		if !ok {
 			t.Fatal("not ok")
 		}
 
-		if output != tc.Output {
-			t.Fatalf("%d: bad: %#v", i, output)
+		if out != tc.out {
+			t.Fatalf("%d: bad: %#v", i, out)
 		}
 	}
 }