Test matcher descriptions

spec/spectator/matchers/built_in/be_a_matcher_spec.cr

@@ -65,6 +65,13 @@ Spectator.describe BeAMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeAMatcher(Int32).new
+      expect(matcher.to_s).to eq("be a Int32")
+    end
+  end
+
   context "DSL" do
     describe "`be_a`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_between_matcher_spec.cr

@@ -124,6 +124,22 @@ Spectator.describe BeBetweenMatcher do
     end
   end
 
+  describe "#to_s" do
+    context "inclusive" do
+      it "returns the description" do
+        matcher = BeBetweenMatcher.new(40, 50)
+        expect(matcher.to_s).to eq "be between 40 and 50 (inclusive)"
+      end
+    end
+
+    context "exclusive" do
+      it "returns the description" do
+        matcher = BeBetweenMatcher.new(40, 50).exclusive
+        expect(matcher.to_s).to eq "be between 40 and 50 (exclusive)"
+      end
+    end
+  end
+
   context "DSL" do
     describe "`be_between`" do
       it "is inclusive by default" do

spec/spectator/matchers/built_in/be_blank_matcher_spec.cr

@@ -50,6 +50,13 @@ Spectator.describe BeBlankMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeBlankMatcher.new
+      expect(matcher.to_s).to eq("be blank")
+    end
+  end
+
   context "DSL" do
     describe "`be_blank`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_close_matcher_spec.cr

@@ -50,6 +50,13 @@ Spectator.describe BeCloseMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeCloseMatcher.new(1.0, 0.1)
+      expect(matcher.to_s).to eq("be within 0.1 of 1.0")
+    end
+  end
+
   describe "DSL" do
     describe "`be_close`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_empty_matcher_spec.cr

@@ -66,6 +66,13 @@ Spectator.describe BeEmptyMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeEmptyMatcher.new
+      expect(matcher.to_s).to eq("be empty")
+    end
+  end
+
   context "DSL" do
     describe "`be_empty`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_in_matcher_spec.cr

@@ -35,6 +35,13 @@ Spectator.describe BeInMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeInMatcher.new([1, 2, 3])
+      expect(matcher.to_s).to eq("be in [1, 2, 3]")
+    end
+  end
+
   describe "DSL" do
     describe "`be_in`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_infinite_matcher_spec.cr

@@ -126,6 +126,13 @@ Spectator.describe BeInfiniteMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeInfiniteMatcher.new
+      expect(matcher.to_s).to eq("be infinite")
+    end
+  end
+
   context "DSL" do
     describe "`be_infinite`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_instance_of_matcher_spec.cr

@@ -71,6 +71,13 @@ Spectator.describe BeInstanceOfMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the inspect string" do
+      matcher = BeInstanceOfMatcher(Int32).new
+      expect(matcher.to_s).to eq("be an instance of Int32")
+    end
+  end
+
   describe "DSL" do
     describe "`be_instance_of`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_matcher_spec.cr

@@ -75,6 +75,13 @@ Spectator.describe BeMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeMatcher.new(1)
+      expect(matcher.to_s).to eq("be 1 : Int32")
+    end
+  end
+
   describe "DSL" do
     describe "`be`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_nan_matcher_spec.cr

@@ -70,6 +70,13 @@ Spectator.describe BeNaNMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeNaNMatcher.new
+      expect(matcher.to_s).to eq("be NaN")
+    end
+  end
+
   describe "DSL" do
     describe "`be_nan`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_negative_matcher_spec.cr

@@ -85,6 +85,13 @@ Spectator.describe BeNegativeMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeNegativeMatcher.new
+      expect(matcher.to_s).to eq("be negative")
+    end
+  end
+
   describe "DSL" do
     describe "`be_negative`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_positive_matcher_spec.cr

@@ -85,6 +85,13 @@ Spectator.describe BePositiveMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BePositiveMatcher.new
+      expect(matcher.to_s).to eq("be positive")
+    end
+  end
+
   describe "DSL" do
     describe "`be_positive`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_truthy_matcher_spec.cr

@@ -81,6 +81,13 @@ Spectator.describe BeTruthyMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeTruthyMatcher.new
+      expect(matcher.to_s).to eq("be truthy")
+    end
+  end
+
   context "DSL" do
     describe "`be_truthy`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/be_zero_matcher_spec.cr

@@ -85,6 +85,13 @@ Spectator.describe BeZeroMatcher do
     end
   end
 
+  describe "#to_s" do
+    it "returns the description" do
+      matcher = BeZeroMatcher.new
+      expect(matcher.to_s).to eq("be zero")
+    end
+  end
+
   describe "DSL" do
     describe "`be_zero`" do
       context "with `.to`" do

spec/spectator/matchers/built_in/match_matcher_spec.cr

@@ -112,6 +112,22 @@ Spectator.describe MatchMatcher do
     end
   end
 
+  describe "#to_s" do
+    context "with a string" do
+      it "returns the description" do
+        matcher = MatchMatcher.new(/foo/)
+        expect(matcher.to_s).to eq("match /foo/")
+      end
+    end
+
+    context "with a regex" do
+      it "returns the description" do
+        matcher = MatchMatcher.new("foobar")
+        expect(matcher.to_s).to eq("match \"foobar\"")
+      end
+    end
+  end
+
   describe "DSL" do
     describe "`match`" do
       context "with `.to`" do

src/spectator/matchers/built_in/match_matcher.cr

@@ -22,7 +22,7 @@ module Spectator::Matchers::BuiltIn
     end
 
     def to_s(io : IO) : Nil
-      io << "match " << @expected_value
+      io << "match " << description_of(@expected_value)
     end
   end
 end