add tests for hash

Author: tzneal

object/object_test.go

@@ -0,0 +1,101 @@
+package object_test
+
+import (
+	"testing"
+
+	"github.com/awslabs/operatorpkg/object"
+)
+
+func TestHashConsistency(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    any
+		expected string
+	}{
+		{
+			name:     "string",
+			input:    "test",
+			expected: "4750482246928359241",
+		},
+		{
+			name:     "int",
+			input:    42,
+			expected: "6502725087716144517",
+		},
+		{
+			name:     "struct",
+			input:    struct{ Name string }{Name: "test"},
+			expected: "8856711690231820218",
+		},
+		{
+			name:     "map",
+			input:    map[string]string{"key": "value"},
+			expected: "17998630672759287760",
+		},
+		{
+			name:     "slice",
+			input:    []string{"a", "b", "c"},
+			expected: "16898053174053854585",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := object.Hash(tt.input)
+			if result != tt.expected {
+				t.Errorf("Hash() = %v, want %v", result, tt.expected)
+			}
+		})
+	}
+
+	// Test consistency
+	t.Run("consistency", func(t *testing.T) {
+		input := "consistent"
+		hash1 := object.Hash(input)
+		hash2 := object.Hash(input)
+		if hash1 != hash2 {
+			t.Errorf("Hash should be consistent: %v != %v", hash1, hash2)
+		}
+	})
+}
+
+type obj1 struct {
+	bar map[string]string
+}
+
+func TestHashExpectedDifferences(t *testing.T) {
+	testObjects := []any{
+		0,
+		"0",
+		[]int{},
+		struct{}{},
+		struct {
+			foo []obj1
+		}{
+			foo: []obj1{
+				{
+					bar: map[string]string{"a": "b", "c": "d"},
+				},
+			}},
+		struct {
+			foo []obj1
+		}{
+			foo: []obj1{
+				{
+					bar: map[string]string{"a": "b"},
+				},
+				{
+					bar: map[string]string{"c": "d"},
+				},
+			}},
+	}
+	testHashes := map[string]struct{}{}
+	for _, obj := range testObjects {
+		hash := object.Hash(obj)
+		if _, exists := testHashes[hash]; exists {
+			t.Errorf("Hash collision detected: %v", hash)
+		}
+		testHashes[hash] = struct{}{}
+	}
+
+}