Add tests for HasBeenPwned function

Introduced unit tests for the HasBeenPwned function in the hibp_test.go file. These tests consist of scenarios with both secured and compromised passwords, improving the function's reliability and error handling capabilities.

hibp_test.go

@@ -0,0 +1,27 @@
+package apg
+
+import (
+	"testing"
+)
+
+func TestHasBeenPwned(t *testing.T) {
+	tests := []struct {
+		name     string
+		password string
+		want     bool
+	}{
+		{"Pwned PW", "Test123", true},
+		{"Secure PW", "Cta8mWYmW7O*j1V!YMTS", false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := HasBeenPwned(tt.password)
+			if err != nil {
+				t.Errorf("HasBeenPwned() failed: %s", err)
+			}
+			if tt.want != got {
+				t.Errorf("HasBeenPwned() failed, wanted: %t, got: %t", tt.want, got)
+			}
+		})
+	}
+}