adding a test for parsing size strings

media_test.go

@@ -0,0 +1,49 @@
+package caddyhugo
+
+import (
+	"fmt"
+	"image"
+	"testing"
+)
+
+// TestThumbSizeStrings tests parsing various size strings, which doesn't include
+// scaling zeros, but does use the actual image size to infer single-dimension
+// strings
+func TestThumbSizeStrings(t *testing.T) {
+	type testcase struct {
+		input      string
+		actualSize image.Rectangle
+		expect     image.Rectangle
+	}
+
+	i50x100 := image.Rect(0, 0, 50, 100)
+	i100x100 := image.Rect(0, 0, 100, 100)
+
+	var cases = []testcase{
+		{"100x100", i100x100, image.Rect(0, 0, 100, 100)},
+		{"x100", i100x100, image.Rect(0, 0, 0, 100)},
+		{"100x", i100x100, image.Rect(0, 0, 100, 0)},
+		{"100", i100x100, image.Rect(0, 0, 100, 0)},
+
+		{"100x100", i50x100, image.Rect(0, 0, 100, 100)},
+		{"x100", i50x100, image.Rect(0, 0, 0, 100)},
+		{"100x", i50x100, image.Rect(0, 0, 100, 0)},
+		{"100", i50x100, image.Rect(0, 0, 0, 100)},
+	}
+
+	for _, c := range cases {
+		t.Run(fmt.Sprint(c.input, "=>", c.actualSize), func(t *testing.T) {
+			got, err := parseSizeString(c.input, image.Rect(0, 0, 100, 100))
+			if err != nil {
+				t.Errorf("error parsing size string: %v", err)
+				return
+			}
+
+			if !got.Eq(c.expect) {
+				t.Errorf("expected %v, got %v", c.expect, got)
+				return
+			}
+
+		})
+	}
+}