feat: added FileEmpty, FileNotEmpty

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

Author: fredbi

assert/assertions.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io/fs"
 	"math"
 	"os"
 	"reflect"
@@ -1885,6 +1886,14 @@ func FileEmpty(t TestingT, path string, msgAndArgs ...any) bool {
 	if info.IsDir() {
 		return Fail(t, fmt.Sprintf("%q is a directory", path), msgAndArgs...)
 	}
+	if info.Mode()&fs.ModeSymlink > 0 {
+		target, err := os.Readlink(path)
+		if err != nil {
+			return Fail(t, fmt.Sprintf("could not resolve symlink %q", path), msgAndArgs...)
+		}
+		return FileEmpty(t, target, msgAndArgs...)
+	}
+
 	if info.Size() > 0 {
 		return Fail(t, fmt.Sprintf("%q is not empty", path), msgAndArgs...)
 	}
@@ -1908,6 +1917,14 @@ func FileNotEmpty(t TestingT, path string, msgAndArgs ...any) bool {
 	if info.IsDir() {
 		return Fail(t, fmt.Sprintf("%q is a directory", path), msgAndArgs...)
 	}
+	if info.Mode()&fs.ModeSymlink > 0 {
+		target, err := os.Readlink(path)
+		if err != nil {
+			return Fail(t, fmt.Sprintf("could not resolve symlink %q", path), msgAndArgs...)
+		}
+		return FileNotEmpty(t, target, msgAndArgs...)
+	}
+
 	if info.Size() == 0 {
 		return Fail(t, fmt.Sprintf("%q is empty", path), msgAndArgs...)
 	}

assert/assertions_test.go

@@ -2738,7 +2738,7 @@ func getTempSymlinkPath(t *testing.T, file string) string {
 	t.Helper()
 
 	tempDir := t.TempDir()
-	link := filepath.Join(tempDir, file+"_symlink")
+	link := filepath.Join(tempDir, filepath.Base(file)+"_symlink")
 	if err := os.Symlink(file, link); err != nil {
 		t.Fatalf("could not create temp symlink %q pointing to %q: %v", link, file, err)
 	}
@@ -2787,6 +2787,62 @@ func TestNoDirExists(t *testing.T) {
 	True(t, NoDirExists(mockT, link))
 }
 
+func TestFileEmpty(t *testing.T) {
+	t.Parallel()
+
+	mockT := new(testing.T)
+	True(t, FileEmpty(mockT, filepath.Join("testdata", "empty_file")))
+
+	mockT = new(testing.T)
+	False(t, FileEmpty(mockT, "assertions.go"))
+
+	mockT = new(testing.T)
+	False(t, FileEmpty(mockT, "random_file"))
+
+	mockT = new(testing.T)
+	False(t, FileEmpty(mockT, "../_codegen"))
+
+	link := getTempSymlinkPath(t, filepath.Join("testdata", "empty_file"))
+	mockT = new(testing.T)
+	True(t, FileEmpty(mockT, link))
+
+	link = getTempSymlinkPath(t, "assertions.go")
+	mockT = new(testing.T)
+	False(t, FileEmpty(mockT, link))
+
+	link = getTempSymlinkPath(t, "non_existent_file")
+	mockT = new(testing.T)
+	False(t, FileEmpty(mockT, link))
+}
+
+func TestFileNotEmpty(t *testing.T) {
+	t.Parallel()
+
+	mockT := new(testing.T)
+	True(t, FileNotEmpty(mockT, "assertions.go"))
+
+	mockT = new(testing.T)
+	False(t, FileNotEmpty(mockT, filepath.Join("testdata", "empty_file")))
+
+	mockT = new(testing.T)
+	False(t, FileNotEmpty(mockT, "non_existent_file"))
+
+	mockT = new(testing.T)
+	False(t, FileNotEmpty(mockT, "../_codegen"))
+
+	link := getTempSymlinkPath(t, filepath.Join("testdata", "empty_file"))
+	mockT = new(testing.T)
+	False(t, FileNotEmpty(mockT, link))
+
+	link = getTempSymlinkPath(t, "assertions.go")
+	mockT = new(testing.T)
+	True(t, FileNotEmpty(mockT, link))
+
+	link = getTempSymlinkPath(t, "non_existent_file")
+	mockT = new(testing.T)
+	False(t, NoFileExists(mockT, link))
+}
+
 func TestJSONEq_EqualSONString(t *testing.T) {
 	t.Parallel()