1 files changed, 56 insertions, 0 deletions
diff --git a/evaluator_test.go b/evaluator_test.go
new file mode 100644
index 0000000..8c956a6
--- /dev/null
+++ b/evaluator_test.go
@@ -0,0 +1,56 @@
+package expression
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestEvaluator_Eval(t *testing.T) {
+	type args struct {
+		expression string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    any
+		wantErr bool
+	}{
+		{
+			name: "simple math",
+			args: args{
+				expression: "2 + 2 * 2 + max(4,9)",
+			},
+			want:    2 + 2*2 + 9,
+			wantErr: false,
+		},
+		{
+			name: "simple math 2",
+			args: args{
+				expression: "10 % 5",
+			},
+			want:    10 % 5,
+			wantErr: false,
+		},
+		{
+			name: "simple math 3",
+			args: args{
+				expression: "10 / 5",
+			},
+			want:    10 / 5,
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			e := New()
+			got, err := e.Eval(tt.args.expression)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Evaluator.Eval() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Evaluator.Eval() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}