1 files changed, 63 insertions, 0 deletions
diff --git a/spec/tokens_spec.cr b/spec/tokens_spec.cr
new file mode 100644
index 0000000..ab43ce2
--- /dev/null
+++ b/spec/tokens_spec.cr
@@ -0,0 +1,63 @@
+require "./spec_helper"
+
+include Parcom
+
+describe Tokens do
+  describe ".from_string" do
+    it "constructs a Tokens(Char) from a String" do
+      tokens = Tokens.from_string("abcd")
+      tokens.tokens.should eq("abcd".chars)
+    end
+  end
+
+  describe "#initialize" do
+    it "wraps an array with the contents of the given iterable" do
+      set = Set{'a', 'b', 'c', 'd'}
+      tokens = Tokens.new(set)
+      tokens.tokens.should eq(set.to_a)
+
+      arr = "abcd".chars
+      tokens = Tokens.new(arr)
+      tokens.tokens.should eq(arr)
+    end
+  end
+
+  context do
+    tokens_empty = Tokens.new([] of Char)
+    tokens = Tokens.from_string("abcd")
+
+    describe "#[]" do
+      it "returns the token at the given index" do
+        tokens[2].should eq('c')
+        expect_raises(IndexError) { tokens_empty[2] }
+      end
+
+      it "returns a new Tokens similar to Array#[](Int, Int)" do
+        tokens[1, 5].should eq(Tokens.new(['b', 'c', 'd']))
+        expect_raises(IndexError) { tokens_empty[1, 5] }
+      end
+
+      it "returns a new Tokens similar to Array#[](Range)" do
+        tokens[1..3].should eq(Tokens.new(['b', 'c', 'd']))
+        expect_raises(IndexError) { tokens_empty[1..3] }
+      end
+    end
+
+    describe "#[]?" do
+      it "analogous to `Array#[]?`" do
+        # we should only need to check the nil-returning cases
+        tokens_empty[2]?.should be_nil
+        tokens_empty[1, 5]?.should be_nil
+        tokens_empty[1..3]?.should be_nil
+      end
+    end
+
+    describe "#empty?" do
+      it "exposes the `#empty?` method of the wrapped array" do
+        tokens.empty?.should be_false
+        tokens_empty.empty?.should be_true
+      end
+    end
+  end
+end
+