Function TestCaseExpression

pkg/sql/ast/nodes_test.go:924–975

Test CaseExpression node

(t *testing.T)

// Test CaseExpression node
func TestCaseExpression(t *testing.T) {
	tests := []struct {
		name         string
		caseExpr     *CaseExpression
		wantLiteral  string
		wantChildren int
	}{
		{
			name: "simple CASE with WHEN clauses",
			caseExpr: &CaseExpression{
				WhenClauses: []WhenClause{
					{Condition: &BinaryExpression{Operator: "="}, Result: &LiteralValue{Value: "1"}},
					{Condition: &BinaryExpression{Operator: ">"}, Result: &LiteralValue{Value: "2"}},
				},
			},
			wantLiteral:  "CASE",
			wantChildren: 2,
		},
		{
			name: "CASE with value and ELSE",
			caseExpr: &CaseExpression{
				Value: &Identifier{Name: "status"},
				WhenClauses: []WhenClause{
					{Condition: &LiteralValue{Value: "active"}, Result: &LiteralValue{Value: "1"}},
				},
				ElseClause: &LiteralValue{Value: "0"},
			},
			wantLiteral:  "CASE",
			wantChildren: 3,
		},
	}

	for _, tt := range tests {
		tt := tt // G601: Create local copy to avoid memory aliasing
		t.Run(tt.name, func(t *testing.T) {
			// Test TokenLiteral
			if got := tt.caseExpr.TokenLiteral(); got != tt.wantLiteral {
				t.Errorf("CaseExpression.TokenLiteral() = %v, want %v", got, tt.wantLiteral)
			}

			// Test Children
			children := tt.caseExpr.Children()
			if len(children) != tt.wantChildren {
				t.Errorf("CaseExpression.Children() count = %d, want %d", len(children), tt.wantChildren)
			}

			// Test that it implements Expression interface
			var _ Expression = tt.caseExpr
			tt.caseExpr.expressionNode()
		})
	}
}

// Test ExistsExpression node
func TestExistsExpression(t *testing.T) {