feat: EvaluationContext add constructor without TargetingKey (#204)

Add constructor without TargetingKey

Signed-off-by: Thomas Poignant <thomas.poignant@gofeatureflag.org>

pkg/openfeature/evaluation_context.go

@@ -46,3 +46,10 @@ func NewEvaluationContext(targetingKey string, attributes map[string]interface{}
 		attributes:   attrs,
 	}
 }
+
+// NewTargetlessEvaluationContext constructs an EvaluationContext with an empty targeting key
+//
+// attributes - contextual data used in flag evaluation
+func NewTargetlessEvaluationContext(attributes map[string]interface{}) EvaluationContext {
+	return NewEvaluationContext("", attributes)
+}

pkg/openfeature/evaluation_context_test.go

@@ -171,3 +171,17 @@ func TestEvaluationContext_AttributesFuncNotPassedByReference(t *testing.T) {
 		t.Error("mutation of map passed to SetAttributes caused a mutation of its attributes field")
 	}
 }
+
+func TestNewTargetlessEvaluationContext(t *testing.T) {
+	attributes := map[string]interface{}{
+		"foo": "bar",
+	}
+	evalCtx := NewTargetlessEvaluationContext(attributes)
+	if evalCtx.targetingKey != "" {
+		t.Error("targeting key should not be set with NewTargetlessEvaluationContext")
+	}
+
+	if !reflect.DeepEqual(evalCtx.Attributes(), attributes) {
+		t.Errorf("we expect no difference in the attributes")
+	}
+}