test(verify): add FuzzResult.String and arrayLen tests to lift coverage over 80%

Assisted-by: GLM 5.2

verify/fuzz_extra_test.go

@@ -0,0 +1,52 @@
+// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
+// SPDX-License-Identifier: BSD-3-Clause
+
+package verify
+
+import (
+	"testing"
+)
+
+func TestFuzzResultString(t *testing.T) {
+	t.Run("ok", func(t *testing.T) {
+		r := FuzzResult{Func: "add", Iterations: 100, Matches: 100}
+		s := r.String()
+		if s != "add: 100/100 iterations match" {
+			t.Errorf("String() = %q", s)
+		}
+	})
+
+	t.Run("mismatch", func(t *testing.T) {
+		r := FuzzResult{Func: "mul", Iterations: 100, Matches: 95, Mismatches: 5, FirstFail: "iter 23"}
+		s := r.String()
+		if s != "mul: 95/100 match, 5 MISMATCH — iter 23" {
+			t.Errorf("String() = %q", s)
+		}
+	})
+
+	t.Run("crash", func(t *testing.T) {
+		r := FuzzResult{Func: "dec", Iterations: 100, Matches: 99, Mismatches: 1, FirstFail: "SIGSEGV", CrashInput: []byte{0x01, 0x02}}
+		s := r.String()
+		if s != "dec: 99/100 match, 1 MISMATCH — SIGSEGV\n  input: 0102" {
+			t.Errorf("String() = %q", s)
+		}
+	})
+}
+
+func TestArrayLen(t *testing.T) {
+	tests := []struct {
+		typ  string
+		want int
+	}{
+		{"*[32]uint16", 32},
+		{"*[16]int32", 16},
+		{"bad", 1},
+		{"*[]", 1},
+		{"*[0x]", 1},
+	}
+	for _, tt := range tests {
+		if got := arrayLen(tt.typ); got != tt.want {
+			t.Errorf("arrayLen(%q) = %d, want %d", tt.typ, got, tt.want)
+		}
+	}
+}