From fb875cebb83ca3db38fe4c58ca29a439300ffda2 Mon Sep 17 00:00:00 2001
From: alresvor <alresvor@gmail.com>
Date: Thu, 17 Nov 2022 00:21:14 +0800
Subject: [PATCH] add test case

---
 reflect_test.go | 148 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100644 reflect_test.go

diff --git a/reflect_test.go b/reflect_test.go
new file mode 100644
index 0000000..39a1bf4
--- /dev/null
+++ b/reflect_test.go
@@ -0,0 +1,148 @@
+package reflect
+
+import (
+	"reflect"
+	"testing"
+	"unsafe"
+)
+
+// Test code from https://github.com/darkgopher/darkness/blob/master/deepcopy_test.go
+
+func TestDeepCopy(t *testing.T) {
+	// this variable is here to make sure that the unsafe.Pointer points to a
+	// valid address, just typing in a random number makes the go runtime crash
+	// when cleaning up the test as it tries to deallocate whatever is pointed
+	// by the value. e.g. unsafe.Pointer(uintptr(4)) will end up trying to
+	// deallocate the memory at 0x4.
+	var aValidAddress struct{}
+
+	tests := []struct {
+		i interface{}
+	}{
+		{"5"},                              // 0, string
+		{true},                             // 1, bool
+		{1729},                             // 2, int
+		{3.141592},                         // 3, float64
+		{complex(1, 2)},                    // 4, complex
+		{[4]float32{1, 2, 3, 4}},           // 5, array
+		{[]bool{true, false, true, false}}, // 6, slice
+		{map[int]float32{1: 1.2, 3: 3.4, 4: 4.5, 5: 5.5}}, // 7, map
+		{struct {
+			a int
+			b float32
+		}{5, 999.999}}, // 8
+		{func() *int {
+			i := 9
+			return &i
+		}()}, // 9, pointer to int
+		{
+			struct {
+				a int
+				b []float32
+				c struct {
+					d complex64
+				}
+				e *bool
+			}{
+				a: 5,
+				b: []float32{1.1, 2.2, 3.3, 4.4},
+				c: struct {
+					d complex64
+				}{d: complex(9.9, 8.8)},
+				e: func() *bool {
+					mybool := true
+					return &mybool
+				}(),
+			},
+		}, // 10, more complex test
+		{uintptr(unsafe.Pointer(&aValidAddress))}, // 11, uintptr
+		// {unsafe.Pointer(&aValidAddress)},          // 12, unsafe.Pointer
+	}
+
+	for i, test := range tests {
+		t.Logf("starting test %d, on %+v", i, test.i)
+		j := DeepCopy(test.i)
+		if !reflect.DeepEqual(test.i, j) {
+			t.Errorf("[%d] problem want %v, got %v", i, test.i, j)
+		}
+	}
+}
+
+func TestDeepCopyStringExceptions(t *testing.T) {
+	s := "Hello world!"
+	r := struct {
+		s0 string
+		s1 string
+	}{
+		s0: s,
+		s1: s[:5],
+	}
+	u := DeepCopy(r)
+	if !reflect.DeepEqual(u, r) {
+		t.Fatalf("not equal got %v, want %v", u, r)
+	}
+}
+
+// TestDeepCopyChannel tests the copying of channels, reflect.DeepEqual doesn't
+// work on those.
+func TestDeepCopyChannel(t *testing.T) {
+	c := make(chan struct{})
+	v, ok := any(DeepCopy(c)).(chan struct{})
+	if !ok {
+		t.Errorf("expected a chan struct{}, got %T", v)
+	}
+}
+
+// TestDeepCopyPointers
+func TestDeepCopyPointers(t *testing.T) {
+	var i int
+	ptr := &i
+	cp, ok := any(DeepCopy(ptr)).(*int)
+	if !ok {
+		t.Fatal("expected a *int")
+	}
+
+	if cp == ptr {
+		t.Fatalf("pointers should be different, %v", cp)
+	}
+
+	if *cp != *ptr {
+		t.Fatalf("pointed values should be the same, got %d, want %d", *cp, *ptr)
+	}
+}
+
+// TestDeepCopyRing tests that a circular reference doesn't go out of control
+// and allocate everything.
+func TestDeepCopyRing(t *testing.T) {
+	type T struct {
+		a    int
+		next *T
+	}
+
+	// make a circular reference
+	t0, t1, t2 := &T{a: 0}, &T{a: 1}, &T{a: 2}
+	t0.next = t1
+	t1.next = t2
+	t2.next = t0
+
+	i := DeepCopy(t0)
+	r0, ok := any(i).(*T)
+	if !ok {
+		t.Fatalf("did not receive a *T, but a %T", i)
+	}
+	if r0.next == nil {
+		t.Fatal("r0.next was nil ?")
+	}
+	r1 := r0.next
+	if r1.next == nil {
+		t.Fatal("r1.next was nil ?")
+	}
+	r2 := r1.next
+	if r2.next != r0 {
+		t.Fatal("r2.next wasn't linked back to r0")
+	}
+
+	if t0.a != r0.a || t1.a != r1.a || t2.a != r2.a {
+		t.Fatalf("data not copied correctly %v, %v, %v != %v, %v, %v", t0, t1, t2, r0, r1, r2)
+	}
+}