spark_test.go

package spark

import (
	"testing"
)

func TestLine(t *testing.T) {
	in := []float64{1, 2, 3, 4, 5, 6, 7, 8}
	out := "▁▂▃▄▅▆▇█"
	if x := Line(in); x != out {
		t.Errorf("Line(%v) = %v, want %v", in, x, out)
	}

	in = []float64{1, 0, 0, 1}
	out = "█▁▁█"
	if x := Line(in); x != out {
		t.Errorf("Line(%v) = %v, want %v", in, x, out)
	}

	in = []float64{67, 71, 77, 85, 95, 104, 106, 105, 100, 89, 76, 66}
	out = "▁▂▃▄▆███▇▅▃▁"
	if x := Line(in); x != out {
		t.Errorf("Line(%v) = %v, want %v", in, x, out)
	}
}

// If all values are the same they should be treated as "minimal value"
func TestSameValues(t *testing.T) {
	in := []float64{1}
	out := "▁"
	if x := Line(in); x != out {
		t.Errorf("Line(%v) = %v, want %v", in, x, out)
	}

	in = []float64{1, 1, 1, 1}
	out = "▁▁▁▁"
	if x := Line(in); x != out {
		t.Errorf("Line(%v) = %v, want %v", in, x, out)
	}
}

func TestLineEmpty(t *testing.T) {
	in := []float64{}
	out := ""
	if x := Line(in); x != out {
		t.Errorf("Line(%v) = %v, want %v", in, x, out)
	}
}