Add fuzz_coverage_test.go

Author: antonmedv

test/fuzz/fuzz_coverage_test.go

@@ -0,0 +1,62 @@
+package fuzz_test
+
+import (
+	_ "embed"
+	"github.com/stretchr/testify/require"
+	"strings"
+	"testing"
+
+	"github.com/antonmedv/expr"
+)
+
+//go:embed fuzz_corpus.txt
+var fuzzCorpus string
+
+func TestFuzzExpr_Coverage(t *testing.T) {
+	inputs := strings.Split(strings.TrimSpace(fuzzCorpus), "\n")
+
+	var env = map[string]any{
+		"ok":    true,
+		"f64":   .5,
+		"f32":   float32(.5),
+		"i":     1,
+		"i64":   int64(1),
+		"i32":   int32(1),
+		"array": []int{1, 2, 3, 4, 5},
+		"list":  []Foo{{"bar"}, {"baz"}},
+		"foo":   Foo{"bar"},
+		"add":   func(a, b int) int { return a + b },
+		"div":   func(a, b int) int { return a / b },
+		"half":  func(a float64) float64 { return a / 2 },
+		"score": func(a int, x ...int) int {
+			s := a
+			for _, n := range x {
+				s += n
+			}
+			return s
+		},
+		"greet": func(name string) string { return "Hello, " + name },
+	}
+
+	for _, code := range inputs {
+		t.Run(code, func(t *testing.T) {
+			program, err := expr.Compile(code, expr.Env(env))
+			require.NoError(t, err)
+
+			_, err = expr.Run(program, env)
+			require.NoError(t, err)
+		})
+	}
+}
+
+type Foo struct {
+	Bar string
+}
+
+func (f Foo) String() string {
+	return "foo"
+}
+
+func (f Foo) Qux(s string) string {
+	return f.Bar + s
+}