test: add test for ast.go

Author: link-duan

ast_test.go

@@ -0,0 +1,28 @@
+package excelformulaparser
+
+import "testing"
+
+func TestPos(t *testing.T) {
+	var p = Pos{Line: 1, Column: 2}
+	if p.String() != "(1,2)" {
+		t.Errorf("Expected '(1,2)', got '%s'", p.String())
+	}
+	p.nextLine()
+	if p.String() != "(2,1)" {
+		t.Errorf("Expected '(2,1)', got '%s'", p.String())
+	}
+	p.nextColumn()
+	if p.String() != "(2,2)" {
+		t.Errorf("Expected '(2,2)', got '%s'", p.String())
+	}
+}
+
+func TestIdent(t *testing.T) {
+	var ident = IdentExpr{
+		baseNode: newBaseNode(Pos{Line: 1, Column: 1}, Pos{Line: 1, Column: 4}),
+		Name:     newToken(Pos{Line: 1, Column: 1}, Pos{Line: 1, Column: 4}, Ident, "NAME"),
+	}
+	if ident.String() != "IdentExpr(Name: NAME)" {
+		t.Errorf("Expected 'IdentExpr(Name: NAME)', got '%s'", ident.String())
+	}
+}