Added a regression test for image size

Signed-off-by: Mohammed Affan <72978371+Affan-7@users.noreply.github.com>

Author: Affan-7

cli/command/formatter/image_test.go

@@ -40,6 +40,11 @@ func TestImageContext(t *testing.T) {
 			expValue: "10B",
 			call:     ctx.Size,
 		},
+		{
+			imageCtx: imageContext{i: types.ImageSummary{Size: 999900000}, trunc: true},
+			expValue: "999.9MB",
+			call:     ctx.Size,
+		},
 		{
 			imageCtx: imageContext{i: types.ImageSummary{Created: unix}, trunc: true},
 			expValue: time.Unix(unix, 0).String(), call: ctx.CreatedAt,