recover and optional

1 files changed, 47 insertions, 0 deletions

diff --git a/spec/parcom_spec.cr b/spec/parcom_spec.cr
index 14e232e..6acd1b2 100644
--- a/spec/parcom_spec.cr
+++ b/spec/parcom_spec.cr
@@ -239,5 +239,52 @@ describe Parser do
       expect_raises(ParserFail) { p.parse(tokens) }
     end
   end
+
+  describe "#recover" do
+    p = Parser(Char, Char).token('a').recover('z')
+
+    it "behaves as normal on success" do
+      tokens = Tokens.from_string("abcd")
+      result = p.parse(tokens)
+
+      result.value.should eq('a')
+      result.tokens.should eq(tokens[1..])
+    end
+
+    tokens2 = Tokens.from_string("bbcd")
+    result2 = p.parse(tokens2)
+
+    it "returns the default value instead of failing" do
+      result2.value.should eq('z')
+    end
+
+    it "does not modify the input when recovering" do
+      result2.tokens.should eq(tokens2)
+    end
+  end
+
+  describe "#optional" do
+    p = Parser(Char, Char).token('a').optional
+
+    it "behaves as normal on success" do
+      tokens = Tokens.from_string("abcd")
+      result = p.parse(tokens)
+
+      result.value.should eq('a')
+      result.tokens.should eq(tokens[1..])
+    end
+
+    tokens2 = Tokens.from_string("bbcd")
+    result2 = p.parse(tokens2)
+
+    it "returns nil instead of failing" do
+      result2.value.should be_nil
+    end
+
+    it "does not modify the input when recovering" do
+      result2.tokens.should eq(tokens2)
+    end
+
+  end
 end