Create adler32_test.go

add hacktoberfest label

Author: dev-priyanshu15

checksum/adler32_test.go

@@ -0,0 +1,24 @@
+package checksum
+
+import "testing"
+
+func TestAdler32(t *testing.T) {
+    tests := []struct {
+        input    string
+        expected string
+    }{
+        {"hello", "1C2C8C41"},
+        {"world", "1C0E26D2"},
+        {"golang", "1C1B48C4"},
+        {"", "00000001"},
+    }
+
+    for _, tt := range tests {
+        t.Run(tt.input, func(t *testing.T) {
+            got := Adler32Hex(tt.input)
+            if got != tt.expected {
+                t.Errorf("Adler32Hex(%q) = %q; want %q", tt.input, got, tt.expected)
+            }
+        })
+    }
+}