Added parser for +- syntax for relative references to snapshots

1 files changed, 31 insertions, 0 deletions

diff --git a/snap/parsing_test.go b/snap/parsing_test.go
new file mode 100644
index 0000000..1a87723
--- /dev/null
+++ b/snap/parsing_test.go
@@ -0,0 +1,31 @@
+package snap
+
+import "testing"
+
+func TestRelativeParsing(t * testing.T) {
+	cases := []struct {
+		snapish string
+		snapshot string
+		offset int
+	} {
+		{"snapshot", "snapshot", 0},
+		{"testing--", "testing", -2},
+		{"%SNAPSHOT%^+++", "%SNAPSHOT%^", 3},
+		{"--prefixed", "--prefixed", 0},
+		{"+++", "", 3},
+		{"---", "", -3},
+		{"+5", "", 5},
+		{"-3", "", -3},
+		{"+", "", 1},
+		{"-", "", -1},
+		{`"-"`, "-", 0},
+	}
+
+	for _, c := range cases {
+		got := ToRelative(c.snapish)
+
+		if got.offset != c.offset || got.snapshot != c.snapshot {
+			t.Errorf("ToRelative(%s) == %+v, wanted %+v", c.snapish, got, c)
+		}
+	}
+}
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