Add the first tests

For #25

docker-compose.yml

@@ -2,11 +2,12 @@ version: "3.8"
 services:
   web:
     image: crystallang/crystal:0.35.1
-    command: crystal run app/twiliosim.cr
+    command: crystal run src/twiliosim.cr
     ports:
       - 3000
     volumes:
-      - ./src:/app
+      - .:/app
+    working_dir: /app
   ngrok:
     image: wernight/ngrok
     ports:

pre-commit.sh

@@ -0,0 +1 @@
+docker-compose run --rm web crystal spec

spec/call_spec.cr

@@ -0,0 +1,73 @@
+require "spec"
+require "../src/models/call"
+
+include Twiliosim
+
+describe Call do
+  describe "#status" do
+    it "initializes created" do
+      call = Call.new("foo", "bar", "baz")
+
+      call.status.should eq "created"
+    end
+
+    it "starts in-progress" do
+      call = Call.new("foo", "bar", "baz")
+
+      call.start
+
+      call.status.should eq "in-progress"
+    end
+
+    it "finished completed" do
+      call = Call.new("foo", "bar", "baz")
+
+      call.finish
+
+      call.status.should eq "completed"
+    end
+  end
+
+  describe "#id" do
+    it "initializes with a new (random) UUID" do
+      call_0 = Call.new("foo_0", "bar_1", "baz_2")
+      call_1 = Call.new("foo_1", "bar_1", "baz_1")
+
+      call_0.id.size.should eq 36
+      call_1.id.size.should eq 36
+      call_0.id.should_not eq call_1.id
+    end
+  end
+
+  describe "#to" do
+    it "initializes OK" do
+      call = Call.new("foo", "bar", "baz")
+
+      call.to.should eq "foo"
+    end
+  end
+
+  describe "#from" do
+    it "initializes OK" do
+      call = Call.new("foo", "bar", "baz")
+
+      call.from.should eq "bar"
+    end
+  end
+
+  describe "#account_sid" do
+    it "initializes OK" do
+      call = Call.new("foo", "bar", "baz")
+
+      call.account_sid.should eq "baz"
+    end
+  end
+
+  describe "#no_reply" do
+    it "initializes OK" do
+      call = Call.new("foo", "bar", "baz")
+
+      call.no_reply.should eq false
+    end
+  end
+end