feat(tests): add unit tests for SanitizeForLog function

.pre-commit-config.yaml

@@ -30,9 +30,9 @@ repos:
         name: Go Test Coverage
         entry: scripts/go-test-coverage.sh
         language: script
-        files: '\.go$'
         pass_filenames: false
         verbose: true
+        always_run: true
       - id: go-vet
         name: Go Vet
         entry: bash -c 'cd backend && go vet ./...'

backend/internal/util/sanitize_test.go

@@ -0,0 +1,71 @@
+package util
+
+import "testing"
+
+func TestSanitizeForLog(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "empty string",
+			input:    "",
+			expected: "",
+		},
+		{
+			name:     "clean string",
+			input:    "Hello World",
+			expected: "Hello World",
+		},
+		{
+			name:     "string with newline",
+			input:    "Hello\nWorld",
+			expected: "Hello World",
+		},
+		{
+			name:     "string with carriage return and newline",
+			input:    "Hello\r\nWorld",
+			expected: "Hello World",
+		},
+		{
+			name:     "string with multiple newlines",
+			input:    "Hello\nWorld\nTest",
+			expected: "Hello World Test",
+		},
+		{
+			name:     "string with control characters",
+			input:    "Hello\x00\x01\x1FWorld",
+			expected: "Hello World",
+		},
+		{
+			name:     "string with DEL character (0x7F)",
+			input:    "Hello\x7FWorld",
+			expected: "Hello World",
+		},
+		{
+			name:     "complex string with mixed control chars",
+			input:    "Line1\r\nLine2\nLine3\x00\x01\x7F",
+			expected: "Line1 Line2 Line3 ",
+		},
+		{
+			name:     "string with tabs (0x09 is control char)",
+			input:    "Hello\tWorld",
+			expected: "Hello World",
+		},
+		{
+			name:     "string with only control chars",
+			input:    "\x00\x01\x02\x1F\x7F",
+			expected: " ",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := SanitizeForLog(tt.input)
+			if result != tt.expected {
+				t.Errorf("SanitizeForLog(%q) = %q, want %q", tt.input, result, tt.expected)
+			}
+		})
+	}
+}