Fix Windows test (after fixing Windows printing): properly escape \ in paths

This PR adds proper escaping to dot strings, so that the backslash (`\`)
in windows paths will now print correctly in dot output. Previously, the
tests were incorreclty checking for an unescaped single `\` in the
output, which isn't a valid `dot` string, so this commit updates the dot
tests to expect the newly correct output.

Updates the path testing assertions in various test files

Author: NHDaly

internal/driver/driver_test.go

@@ -191,9 +191,15 @@ func TestParse(t *testing.T) {
 			if err != nil {
 				t.Fatalf("reading solution file %s: %v", solution, err)
 			}
-			if runtime.GOOS == "windows" {
-				sbuf = bytes.Replace(sbuf, []byte("testdata/"), []byte("testdata\\"), -1)
-				sbuf = bytes.Replace(sbuf, []byte("/path/to/"), []byte("\\path\\to\\"), -1)
+			if runtime.GOOS != "windows" {
+				if flags[0] == "dot" {
+					// The .dot test has the paths inside strings, so \ must be escaped.
+					sbuf = bytes.Replace(sbuf, []byte("testdata/"), []byte(`testdata\\`), -1)
+					sbuf = bytes.Replace(sbuf, []byte("/path/to/"), []byte(`\\path\\to\\`), -1)
+				} else {
+					sbuf = bytes.Replace(sbuf, []byte("testdata/"), []byte(`testdata\`), -1)
+					sbuf = bytes.Replace(sbuf, []byte("/path/to/"), []byte(`\path\to\`), -1)
+				}
 			}
 
 			if flags[0] == "svg" {

internal/report/report_test.go

@@ -80,7 +80,12 @@ func TestSource(t *testing.T) {
 			t.Fatalf("%s: %v", tc.want, err)
 		}
 		if runtime.GOOS == "windows" {
-			gold = bytes.Replace(gold, []byte("testdata/"), []byte("testdata\\"), -1)
+			if tc.rpt.options.OutputFormat == Dot {
+				// The .dot test has the paths inside strings, so \ must be escaped.
+				gold = bytes.Replace(gold, []byte("testdata/"), []byte(`testdata\\`), -1)
+			} else {
+				gold = bytes.Replace(gold, []byte("testdata/"), []byte(`testdata\`), -1)
+			}
 		}
 		if string(b.String()) != string(gold) {
 			d, err := proftest.Diff(gold, b.Bytes())