github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/workload/movr/movr_test.go (about)

     1  // Copyright 2019 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package movr
    12  
    13  import (
    14  	"testing"
    15  
    16  	"github.com/stretchr/testify/require"
    17  )
    18  
    19  func TestCityDistributor(t *testing.T) {
    20  	for numRows := len(cities); numRows < len(cities)*len(cities); numRows++ {
    21  		d := cityDistributor{numRows: numRows}
    22  		for rowIdx := 0; rowIdx < numRows; rowIdx++ {
    23  			cityIdx := d.cityForRow(rowIdx)
    24  			if cityIdx < 0 || cityIdx >= len(cities) {
    25  				t.Fatalf(`city must be in [0,%d) was %d`, len(cities), cityIdx)
    26  			}
    27  			min, max := d.rowsForCity(cityIdx)
    28  			if rowIdx < min || rowIdx >= max {
    29  				t.Fatalf(`row must be in [%d,%d) was %d`, min, max, rowIdx)
    30  			}
    31  		}
    32  		for cityIdx := range cities {
    33  			min, max := d.rowsForCity(cityIdx)
    34  			if min < 0 || min > numRows {
    35  				t.Fatalf(`min must be in [0,%d] was %d`, numRows, min)
    36  			}
    37  			if max < 0 || max > numRows {
    38  				t.Fatalf(`max must be in [0,%d] was %d`, numRows, max)
    39  			}
    40  			if min > max {
    41  				t.Fatalf(`min %d must be <= max %d`, min, max)
    42  			}
    43  			for row := min; row < max; row++ {
    44  				require.Equal(t, cityIdx, d.cityForRow(row), "rows=%d row=%d", numRows, row)
    45  			}
    46  		}
    47  	}
    48  }