From 658876fa4db1bb8363a03135fd22ad61b25050b7 Mon Sep 17 00:00:00 2001
From: Matthew Hall <hallmatthew314@gmail.com>
Date: Fri, 17 Mar 2023 23:54:46 +1300
Subject: recover and optional

---
 spec/parcom_spec.cr | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

(limited to 'spec')

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
 
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