Add tests for auth, rate limiting, security, and util

internal/util/util_test.go

@@ -0,0 +1,40 @@
+package util
+
+import "testing"
+
+func TestHumanSize(t *testing.T) {
+	tests := []struct {
+		in   int64
+		want string
+	}{
+		{0, "0 B"},
+		{1, "1 B"},
+		{1023, "1023 B"},
+		{1024, "1.0 KB"},
+		{1024 * 1024, "1.0 MB"},
+	}
+
+	for _, tt := range tests {
+		if got := HumanSize(tt.in); got != tt.want {
+			t.Fatalf("HumanSize(%d) = %q, want %q", tt.in, got, tt.want)
+		}
+	}
+}
+
+func TestSafeFilename(t *testing.T) {
+	if got := SafeFilename("  hello.txt  "); got != "hello.txt" {
+		t.Fatalf("expected trimmed filename, got %q", got)
+	}
+
+	// Strips control characters, quotes, and backslashes.
+	in := "a\n\rb\t\"c\\d"
+	got := SafeFilename(in)
+	if got != "abcd" {
+		t.Fatalf("SafeFilename(%q) = %q, want %q", in, got, "abcd")
+	}
+
+	// Empty after sanitization becomes default.
+	if got := SafeFilename("\n\r\t"); got != "file" {
+		t.Fatalf("expected default filename, got %q", got)
+	}
+}