add unit test: about slice op.

test/slice_test.go

@@ -0,0 +1,49 @@
+package testing
+
+import (
+	"github.com/Knetic/govaluate"
+	"github.com/projectdiscovery/dsl"
+	"testing"
+)
+
+var data = map[string]interface{}{
+	"username": "johndoe",
+	"email":    "[email protected]",
+	"password": "12345",
+	"ip":       "127.0.0.1",
+	"url":      "https://www.example.com",
+	"date":     "2022-05-01",
+}
+
+func Helper(expressions map[string]string, t *testing.T) {
+	for matcherName, expression := range expressions {
+		compiledExpression, err := govaluate.NewEvaluableExpressionWithFunctions(expression, dsl.DefaultHelperFunctions)
+		if err != nil {
+			t.Logf("Failed to compile expresion: %v\n", expression)
+		}
+
+		result, err := compiledExpression.Evaluate(data)
+		if err != nil {
+			t.Logf("Failed to evaluate expresion: %v\n", expression)
+		}
+
+		if result == true {
+			t.Logf("[%v] matches data\n", matcherName)
+		} else {
+			t.Logf("[%v] not matches data\n", matcherName)
+		}
+	}
+}
+
+func TestSliceOps(t *testing.T) {
+	// Define the expressions to evaluate
+	expressions := map[string]string{
+		"split-01": "index(split(url, '.', -1), 1) == 'example'",
+		// "sprintf-01": "(split(url,'.',-1))[1] == 'example' ",
+		"split-02":   "len(split(url, '.', -1)) == 3",
+		"sprintf-02": "print_debug(split(\"https://www.example.com\", \".\", -1))",
+		"split-04":   "len(url) == 23",
+		"test":       "index(url, 1) == 't'",
+	}
+	Helper(expressions, t)
+}