feat: add Panic and NotPanic.

Author: ghosind

assertion.go

@@ -24,3 +24,13 @@ func (a *Assertion) Equal(actual, expect any, message ...string) error {
 func (a *Assertion) NotEqual(actual, expect any, message ...string) error {
 	return NotEqual(a.t, actual, expect, message...)
 }
+
+// Panic expects the function fn to panic.
+func (a *Assertion) Panic(fn func(), message ...string) (err error) {
+	return Panic(a.t, fn, message...)
+}
+
+// NotPanic asserts that the function fn does not panic.
+func (a *Assertion) NotPanic(fn func(), message ...string) (err error) {
+	return NotPanic(a.t, fn, message...)
+}

panic.go

@@ -0,0 +1,34 @@
+package assert
+
+import (
+	"fmt"
+	"testing"
+)
+
+// Panic expects the function fn to panic.
+func Panic(t *testing.T, fn func(), message ...string) (err error) {
+	defer func() {
+		if e := recover(); e == nil {
+			err = newAssertionError("mssing expected panic", message...)
+		}
+	}()
+
+	fn()
+
+	// err = newAssertionError("mssing expected panic", message...)
+
+	return
+}
+
+// NotPanic asserts that the function fn does not panic.
+func NotPanic(t *testing.T, fn func(), message ...string) (err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			err = newAssertionError(fmt.Sprintf("got unwanted error: %v", e), message...)
+		}
+	}()
+
+	fn()
+
+	return
+}

panic_test.go

@@ -0,0 +1,37 @@
+package assert
+
+import "testing"
+
+func TestPanic(t *testing.T) {
+	mockT := new(testing.T)
+	a := New(mockT)
+
+	if err := a.Panic(func() {
+		panic("expected panic")
+	}); err != nil {
+		t.Errorf("Panic() = %v, want = nil", err)
+	}
+
+	if err := a.Panic(func() {
+		// no panic
+	}); err == nil {
+		t.Error("Panic() = nil, want error")
+	}
+}
+
+func TestNotPanic(t *testing.T) {
+	mockT := new(testing.T)
+	a := New(mockT)
+
+	if err := a.NotPanic(func() {
+		// no panic
+	}); err != nil {
+		t.Errorf("NotPanic() = %v, want = nil", err)
+	}
+
+	if err := a.NotPanic(func() {
+		panic("unexpected panic")
+	}); err == nil {
+		t.Error("NotPanic() = nil, want error")
+	}
+}