sep_by, and some small tweaks

1 files changed, 27 insertions, 1 deletions

diff --git a/spec/parcom_spec.cr b/spec/parcom_spec.cr
index af95953..ba17584 100644
--- a/spec/parcom_spec.cr
+++ b/spec/parcom_spec.cr
@@ -651,7 +651,33 @@ describe Parser do
     end
   end
 
-  # TODO: sep_by
+  describe "#sep_by" do
+    a = Parser.token('a')
+    b = Parser.token('b')
+    p = a.sep_by(b)
+
+    it "fails if it cannot parse the first element" do
+      tokens = Tokens.from_string("cba")
+      expect_raises(ParserFail) { p.parse(tokens) }
+    end
+
+    it "will parse a single element without separators" do
+      tokens = Tokens.from_string("aca")
+      result = p.parse(tokens)
+
+      result.value.should eq(['a'])
+      result.tokens.should eq(tokens[1..])
+    end
+
+    it "will parse one element, and as many others separated by sep" do
+      tokens = Tokens.from_string("abababaa")
+      result = p.parse(tokens)
+
+      result.value.should eq(['a', 'a', 'a', 'a'])
+      result.tokens.should eq(tokens[7..])
+    end
+  end
+
   # TODO: phrase
   # TODO: peek
 end