Add spec for be matcher

spec/helpers/spy_sut.cr

@@ -4,9 +4,18 @@ class SpySUT
   # Number of times the `#==` method was called.
   getter eq_call_count = 0
 
+  # Number of times the `#===` method was called.
+  getter case_eq_call_count = 0
+
   # Returns true and increments `#eq_call_count`.
   def ==(other : T) forall T
     @eq_call_count += 1
     true
   end
+
+  # Returns true and increments `#case_eq_call_count`.
+  def ===(other : T) forall T
+    @case_eq_call_count += 1
+    true
+  end
 end

spec/matchers/case_matcher_spec.cr

@@ -0,0 +1,154 @@
+require "../spec_helper"
+
+describe Spectator::Matchers::CaseMatcher do
+  describe "#match?" do
+    it "compares using #===" do
+      spy = SpySUT.new
+      partial = Spectator::Expectations::ValueExpectationPartial.new(42)
+      matcher = Spectator::Matchers::CaseMatcher.new(spy)
+      matcher.match?(partial).should be_true
+      spy.case_eq_call_count.should be > 0
+    end
+
+    context "with identical values" do
+      it "is true" do
+        value = 42
+        partial = Spectator::Expectations::ValueExpectationPartial.new(value)
+        matcher = Spectator::Matchers::CaseMatcher.new(value)
+        matcher.match?(partial).should be_true
+      end
+    end
+
+    context "with different values" do
+      it "is false" do
+        value1 = 42
+        value2 = 777
+        partial = Spectator::Expectations::ValueExpectationPartial.new(value1)
+        matcher = Spectator::Matchers::CaseMatcher.new(value2)
+        matcher.match?(partial).should be_false
+      end
+    end
+
+    context "with the same instance" do
+      it "is true" do
+        # Box is used because it is a reference type and doesn't override the == method.
+        ref = Box.new([] of Int32)
+        partial = Spectator::Expectations::ValueExpectationPartial.new(ref)
+        matcher = Spectator::Matchers::CaseMatcher.new(ref)
+        matcher.match?(partial).should be_true
+      end
+    end
+
+    context "with different instances" do
+      context "with same contents" do
+        it "is true" do
+          array1 = [1, 2, 3]
+          array2 = [1, 2, 3]
+          partial = Spectator::Expectations::ValueExpectationPartial.new(array1)
+          matcher = Spectator::Matchers::CaseMatcher.new(array2)
+          matcher.match?(partial).should be_true
+        end
+      end
+
+      context "with different contents" do
+        it "is false" do
+          array1 = [1, 2, 3]
+          array2 = [4, 5, 6]
+          partial = Spectator::Expectations::ValueExpectationPartial.new(array1)
+          matcher = Spectator::Matchers::CaseMatcher.new(array2)
+          matcher.match?(partial).should be_false
+        end
+      end
+
+      context "with the same type" do
+        it "is true" do
+          value1 = "foobar"
+          value2 = String
+          partial = Spectator::Expectations::ValueExpectationPartial.new(value1)
+          matcher = Spectator::Matchers::CaseMatcher.new(value2)
+          matcher.match?(partial).should be_true
+        end
+      end
+
+      context "with a different type" do
+        it "is false" do
+          value1 = "foobar"
+          value2 = Array
+          partial = Spectator::Expectations::ValueExpectationPartial.new(value1)
+          matcher = Spectator::Matchers::CaseMatcher.new(value2)
+          matcher.match?(partial).should be_false
+        end
+      end
+    end
+  end
+
+  describe "#message" do
+    it "mentions ===" do
+      value = 42
+      partial = Spectator::Expectations::ValueExpectationPartial.new(value)
+      matcher = Spectator::Matchers::CaseMatcher.new(value)
+      matcher.message(partial).should contain("===")
+    end
+
+    it "contains the actual label" do
+      value = 42
+      label = "everything"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(label, value)
+      matcher = Spectator::Matchers::CaseMatcher.new(value)
+      matcher.message(partial).should contain(label)
+    end
+
+    it "contains the expected label" do
+      value = 42
+      label = "everything"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(value)
+      matcher = Spectator::Matchers::CaseMatcher.new(label, value)
+      matcher.message(partial).should contain(label)
+    end
+
+    context "when expected label is omitted" do
+      it "contains stringified form of expected value" do
+        value1 = 42
+        value2 = 777
+        partial = Spectator::Expectations::ValueExpectationPartial.new(value1)
+        matcher = Spectator::Matchers::CaseMatcher.new(value2)
+        matcher.message(partial).should contain(value2.to_s)
+      end
+    end
+  end
+
+  describe "#negated_message" do
+    it "mentions ===" do
+      value = 42
+      partial = Spectator::Expectations::ValueExpectationPartial.new(value)
+      matcher = Spectator::Matchers::CaseMatcher.new(value)
+      matcher.negated_message(partial).should contain("===")
+    end
+
+    it "contains the actual label" do
+      value = 42
+      label = "everything"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(label, value)
+      matcher = Spectator::Matchers::CaseMatcher.new(value)
+      matcher.negated_message(partial).should contain(label)
+    end
+
+    it "contains the expected label" do
+      value = 42
+      label = "everything"
+      partial = Spectator::Expectations::ValueExpectationPartial.new(value)
+      matcher = Spectator::Matchers::CaseMatcher.new(label, value)
+      matcher.negated_message(partial).should contain(label)
+    end
+
+    context "when expected label is omitted" do
+      it "contains stringified form of expected value" do
+        value1 = 42
+        value2 = 777
+        partial = Spectator::Expectations::ValueExpectationPartial.new(value1)
+        matcher = Spectator::Matchers::CaseMatcher.new(value2)
+        matcher.negated_message(partial).should contain(value2.to_s)
+      end
+    end
+  end
+end