Adding upstream version 2.1.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

text_test.go

@@ -0,0 +1,60 @@
+package chart
+
+import (
+	"testing"
+
+	"github.com/wcharczuk/go-chart/v2/testutil"
+)
+
+func TestTextWrapWord(t *testing.T) {
+	// replaced new assertions helper
+
+	r, err := PNG(1024, 1024)
+	testutil.AssertNil(t, err)
+	f, err := GetDefaultFont()
+	testutil.AssertNil(t, err)
+
+	basicTextStyle := Style{Font: f, FontSize: 24}
+
+	output := Text.WrapFitWord(r, "this is a test string", 100, basicTextStyle)
+	testutil.AssertNotEmpty(t, output)
+	testutil.AssertLen(t, output, 3)
+
+	for _, line := range output {
+		basicTextStyle.WriteToRenderer(r)
+		lineBox := r.MeasureText(line)
+		testutil.AssertTrue(t, lineBox.Width() < 100, line+": "+lineBox.String())
+	}
+	testutil.AssertEqual(t, "this is", output[0])
+	testutil.AssertEqual(t, "a test", output[1])
+	testutil.AssertEqual(t, "string", output[2])
+
+	output = Text.WrapFitWord(r, "foo", 100, basicTextStyle)
+	testutil.AssertLen(t, output, 1)
+	testutil.AssertEqual(t, "foo", output[0])
+
+	// test that it handles newlines.
+	output = Text.WrapFitWord(r, "this\nis\na\ntest\nstring", 100, basicTextStyle)
+	testutil.AssertLen(t, output, 5)
+
+	// test that it handles newlines and long lines.
+	output = Text.WrapFitWord(r, "this\nis\na\ntest\nstring that is very long", 100, basicTextStyle)
+	testutil.AssertLen(t, output, 8)
+}
+
+func TestTextWrapRune(t *testing.T) {
+	// replaced new assertions helper
+
+	r, err := PNG(1024, 1024)
+	testutil.AssertNil(t, err)
+	f, err := GetDefaultFont()
+	testutil.AssertNil(t, err)
+
+	basicTextStyle := Style{Font: f, FontSize: 24}
+
+	output := Text.WrapFitRune(r, "this is a test string", 150, basicTextStyle)
+	testutil.AssertNotEmpty(t, output)
+	testutil.AssertLen(t, output, 2)
+	testutil.AssertEqual(t, "this is a t", output[0])
+	testutil.AssertEqual(t, "est string", output[1])
+}