fix: combination of --fix and --path-prefix (#3700)

Co-authored-by: Fernandez Ludovic <ldez@users.noreply.github.com>

test/fix_test.go

@@ -14,7 +14,9 @@ import (
 // value: "1"
 const envKeepTempFiles = "GL_KEEP_TEMP_FILES"
 
-func TestFix(t *testing.T) {
+func setupTestFix(t *testing.T) []string {
+	t.Helper()
+
 	testshared.SkipOnWindows(t)
 
 	tmpDir := filepath.Join(testdataDir, "fix.tmp")
@@ -33,7 +35,11 @@ func TestFix(t *testing.T) {
 
 	testshared.InstallGolangciLint(t)
 
-	sources := findSources(t, tmpDir, "in", "*.go")
+	return findSources(t, tmpDir, "in", "*.go")
+}
+
+func TestFix(t *testing.T) {
+	sources := setupTestFix(t)
 
 	for _, input := range sources {
 		input := input
@@ -47,13 +53,49 @@ func TestFix(t *testing.T) {
 			}
 
 			testshared.NewRunnerBuilder(t).
-				WithArgs(
-					"--disable-all",
+				WithArgs("--disable-all",
 					"--print-issued-lines=false",
 					"--print-linter-name=false",
 					"--out-format=line-number",
-					"--fix",
-				).
+					"--fix").
+				WithRunContext(rc).
+				WithTargetPath(input).
+				Runner().
+				Run().
+				ExpectExitCode(rc.ExitCode)
+
+			output, err := os.ReadFile(input)
+			require.NoError(t, err)
+
+			expectedOutput, err := os.ReadFile(filepath.Join(testdataDir, "fix", "out", filepath.Base(input)))
+			require.NoError(t, err)
+
+			require.Equal(t, string(expectedOutput), string(output))
+		})
+	}
+}
+
+func TestFix_pathPrefix(t *testing.T) {
+	sources := setupTestFix(t)
+
+	for _, input := range sources {
+		input := input
+		t.Run(filepath.Base(input), func(t *testing.T) {
+			t.Parallel()
+
+			rc := testshared.ParseTestDirectives(t, input)
+			if rc == nil {
+				t.Logf("Skipped: %s", input)
+				return
+			}
+
+			testshared.NewRunnerBuilder(t).
+				WithArgs("--disable-all",
+					"--print-issued-lines=false",
+					"--print-linter-name=false",
+					"--out-format=line-number",
+					"--fix",
+					"--path-prefix=foobar/").
 				WithRunContext(rc).
 				WithTargetPath(input).
 				Runner().