Initial work on assertions

src/spectator/assertion.cr

@@ -0,0 +1,15 @@
+require "./block"
+require "./expression"
+
+module Spectator
+  class Assertion
+    struct Target(T)
+      @expression : Expression(T) | Block(T)
+      @source : Source?
+
+      def initialize(@expression : Expression(T) | Block(T), @source)
+        puts "TARGET: #{@expression} @ #{@source}"
+      end
+    end
+  end
+end

src/spectator/assertion_failed.cr

@@ -0,0 +1,15 @@
+require "./source"
+
+module Spectator
+  # Exception that indicates an assertion failed.
+  # When raised within a test, the test should abort.
+  class AssertionFailed < Exception
+    # Location where the assertion failed and the exception raised.
+    getter source : Source
+
+    # Creates the exception.
+    def initialize(@source : Source, message : String? = nil, cause : Exception? = nil)
+      super(message, cause)
+    end
+  end
+end

src/spectator/dsl.cr

@@ -1,4 +1,5 @@
 # require "./dsl/*"
+require "./dsl/assertions"
 require "./dsl/builder"
 require "./dsl/examples"
 require "./dsl/groups"

src/spectator/dsl/assertions.cr

@@ -1,10 +1,36 @@
-require "../expectations/expectation_partial"
+require "../assertion"
+require "../assertion_failed"
+require "../expression"
 require "../source"
-require "../test_block"
-require "../test_value"
 
-module Spectator
-  module DSL
+module Spectator::DSL
+  # Methods and macros for asserting that conditions are met.
+  module Assertions
+    # Checks that the specified condition is true.
+    # Raises `AssertionFailed` if *condition* is false.
+    # The *message* is passed to the exception.
+    def assert(condition, message, *, _file = __FILE__, _line = __LINE__)
+      raise AssertionFailed.new(Source.new(_file, _line), message) unless condition
+    end
+
+    # Checks that the specified condition is true.
+    # Raises `AssertionFailed` if *condition* is false.
+    # The message of the exception is the *condition*.
+    macro assert(condition)
+      assert({{condition}}, {{condition.stringify}}, _file: {{condition.filename}}, _line: {{condition.line_number}})
+    end
+
+    macro expect(actual)
+      %actual = begin
+        {{actual}}
+      end
+
+      %expression = ::Spectator::Expression.new(%actual, {{actual.stringify}})
+      %source = ::Spectator::Source.new({{actual.filename}}, {{actual.line_number}})
+      ::Spectator::Assertion::Target.new(%expression, %source)
+    end
+  end
+
   # Starts an expectation.
   # This should be followed up with `Spectator::Expectations::ExpectationPartial#to`
   # or `Spectator::Expectations::ExpectationPartial#to_not`.
@@ -212,5 +238,4 @@ module Spectator
   def fail
     fail("Example failed")
   end
-  end
 end

src/spectator/example_failed.cr

@@ -1,5 +0,0 @@
-module Spectator
-  # Exception that indicates an example failed and should abort.
-  class ExampleFailed < Exception
-  end
-end

src/spectator/expectation_failed.cr

@@ -1,15 +0,0 @@
-require "./example_failed"
-
-module Spectator
-  # Exception that indicates a required expectation was not met in an example.
-  class ExpectationFailed < ExampleFailed
-    # Expectation that failed.
-    getter expectation : Expectations::Expectation
-
-    # Creates the exception.
-    # The exception string is generated from the expecation message.
-    def initialize(@expectation)
-      super(@expectation.failure_message)
-    end
-  end
-end

src/spectator/test_context.cr

@@ -6,6 +6,7 @@ require "./dsl"
 # This type is intentionally outside the `Spectator` module.
 # The reason for this is to prevent name collision when using the DSL to define a spec.
 class SpectatorTestContext < SpectatorContext
+  include ::Spectator::DSL::Assertions
   include ::Spectator::DSL::Examples
   include ::Spectator::DSL::Groups
   include ::Spectator::DSL::Hooks