Add spec for `have_key` matcher

spec/matchers/have_key_matcher_spec.cr

@@ -0,0 +1,109 @@
+require "../spec_helper"
+
+describe Spectator::Matchers::HaveKeyMatcher do
+  describe "#match?" do
+    context "against a Hash" do
+      context "with an existing key" do
+        it "is true" do
+          hash = Hash{"foo" => "bar"}
+          key = "foo"
+          partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+          matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+          matcher.match?(partial).should be_true
+        end
+      end
+
+      context "with a non-existent key" do
+        it "is false" do
+          hash = Hash{"foo" => "bar"}
+          key = "baz"
+          partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+          matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+          matcher.match?(partial).should be_false
+        end
+      end
+    end
+
+    context "against a NamedTuple" do
+      context "with an existing key" do
+        it "is true" do
+          tuple = {foo: "bar"}
+          key = :foo
+          partial = Spectator::Expectations::ValueExpectationPartial.new(tuple)
+          matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+          matcher.match?(partial).should be_true
+        end
+      end
+
+      context "with a non-existent key" do
+        it "is false" do
+          tuple = {foo: "bar"}
+          key = :baz
+          partial = Spectator::Expectations::ValueExpectationPartial.new(tuple)
+          matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+          matcher.match?(partial).should be_false
+        end
+      end
+    end
+  end
+
+  describe "#message" do
+    it "contains the actual label" do
+      tuple = {foo: "bar"}
+      key = :foo
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(label, tuple)
+      matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+      matcher.message(partial).should contain(label)
+    end
+
+    it "contains the expected label" do
+      tuple = {foo: "bar"}
+      key = :foo
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(tuple)
+      matcher = Spectator::Matchers::HaveKeyMatcher.new(label, key)
+      matcher.message(partial).should contain(label)
+    end
+
+    context "when the expected label is omitted" do
+      it "contains the stringified key" do
+        tuple = {foo: "bar"}
+        key = :foo
+        partial = Spectator::Expectations::ValueExpectationPartial.new(tuple)
+        matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+        matcher.message(partial).should contain(key.to_s)
+      end
+    end
+  end
+
+  describe "#negated_message" do
+    it "contains the actual label" do
+      tuple = {foo: "bar"}
+      key = :foo
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(label, tuple)
+      matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+      matcher.negated_message(partial).should contain(label)
+    end
+
+    it "contains the expected label" do
+      tuple = {foo: "bar"}
+      key = :foo
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(tuple)
+      matcher = Spectator::Matchers::HaveKeyMatcher.new(label, key)
+      matcher.negated_message(partial).should contain(label)
+    end
+
+    context "when the expected label is omitted" do
+      it "contains the stringified key" do
+        tuple = {foo: "bar"}
+        key = :foo
+        partial = Spectator::Expectations::ValueExpectationPartial.new(tuple)
+        matcher = Spectator::Matchers::HaveKeyMatcher.new(key)
+        matcher.negated_message(partial).should contain(key.to_s)
+      end
+    end
+  end
+end