Implementing Table-Driven Tests

Snippet

Implementing Table-Driven Tests

Table-driven testing is a Go idiom where test cases are defined as a slice of anonymous structs. This makes it easy to add new scenarios and ensures consistent testing logic across multiple inputs.

snippet.go
go
func TestAdd(t *testing.T) {
	tests := []struct {
		a, b, want int
	}{
		{1, 2, 3},
		{0, 0, 0},
		{-1, 1, 0},
	}
 
	for _, tt := range tests {
		got := Add(tt.a, tt.b)
		if got != tt.want {
			t.Errorf("Add(%d, %d) = %d; want %d", tt.a, tt.b, got, tt.want)
		}
	}
}

Breakdown

struct { a, b, want int }

Defines the structure for input parameters and expected output.

range tests

Iterates through each defined test case in the table.

t.Errorf(...)

Reports a failure but allows the loop to continue with other test cases.

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Implementing Table-Driven Tests

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