Add spec for `have_value` matcher

spec/matchers/have_value_matcher_spec.cr

@@ -0,0 +1,85 @@
+require "../spec_helper"
+
+describe Spectator::Matchers::HaveValueMatcher do
+  describe "#match?" do
+    context "with an existing value" do
+      it "is true" do
+        hash = Hash{"foo" => "bar"}
+        value = "bar"
+        partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+        matcher = Spectator::Matchers::HaveValueMatcher.new(value)
+        matcher.match?(partial).should be_true
+      end
+    end
+
+    context "with a non-existent value" do
+      it "is false" do
+        hash = Hash{"foo" => "bar"}
+        value = "baz"
+        partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+        matcher = Spectator::Matchers::HaveValueMatcher.new(value)
+        matcher.match?(partial).should be_false
+      end
+    end
+  end
+
+  describe "#message" do
+    it "contains the actual label" do
+      hash = Hash{"foo" => "bar"}
+      value = "bar"
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(label, hash)
+      matcher = Spectator::Matchers::HaveValueMatcher.new(value)
+      matcher.message(partial).should contain(label)
+    end
+
+    it "contains the expected label" do
+      hash = Hash{"foo" => "bar"}
+      value = "bar"
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+      matcher = Spectator::Matchers::HaveValueMatcher.new(label, value)
+      matcher.message(partial).should contain(label)
+    end
+
+    context "when the expected label is omitted" do
+      it "contains the stringified key" do
+        hash = Hash{"foo" => "bar"}
+        value = "bar"
+        partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+        matcher = Spectator::Matchers::HaveValueMatcher.new(value)
+        matcher.message(partial).should contain(value.to_s)
+      end
+    end
+  end
+
+  describe "#negated_message" do
+    it "contains the actual label" do
+      hash = Hash{"foo" => "bar"}
+      value = "bar"
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(label, hash)
+      matcher = Spectator::Matchers::HaveValueMatcher.new(value)
+      matcher.negated_message(partial).should contain(label)
+    end
+
+    it "contains the expected label" do
+      hash = Hash{"foo" => "bar"}
+      value = "bar"
+      label = "blah"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+      matcher = Spectator::Matchers::HaveValueMatcher.new(label, value)
+      matcher.negated_message(partial).should contain(label)
+    end
+
+    context "when the expected label is omitted" do
+      it "contains the stringified key" do
+        hash = Hash{"foo" => "bar"}
+        value = "bar"
+        partial = Spectator::Expectations::ValueExpectationPartial.new(hash)
+        matcher = Spectator::Matchers::HaveValueMatcher.new(value)
+        matcher.negated_message(partial).should contain(value.to_s)
+      end
+    end
+  end
+end