open sourced parts of game toolkit.

1 files changed, 51 insertions, 0 deletions

diff --git a/dragon/assert.rb b/dragon/assert.rb
new file mode 100644
index 0000000..47d39ef
--- /dev/null
+++ b/dragon/assert.rb
@@ -0,0 +1,51 @@
+# coding: utf-8
+# Copyright 2019 DragonRuby LLC
+# MIT License
+# assert.rb has been released under MIT (*only this file*).
+
+module GTK
+  class Assert
+    attr :assertion_performed
+
+    def ok!
+      @assertion_performed = true
+    end
+
+    def true! value, message = nil
+      @assertion_performed = true
+      if !value
+        message = "#{value} was not truthy.\n#{message}"
+        raise "#{message}"
+      end
+      nil
+    end
+
+    def false! value, message = nil
+      @assertion_performed = true
+      if value
+        message = "#{value} was not falsey.\n#{message}"
+        raise message
+      end
+      nil
+    end
+
+    def equal! actual, expected, message = nil
+      @assertion_performed = true
+      if actual != expected
+        actual_string = "#{actual}#{actual.nil? ? " (nil) " : " " }".strip
+        message = "actual: #{actual_string} did not equal expected: #{expected}.\n#{message}"
+        raise message
+      end
+      nil
+    end
+
+    def nil! value, message = nil
+      @assertion_performed = true
+      if !value.nil?
+        message = "#{value} was supposed to be nil, but wasn't.\n#{message}"
+        raise message
+      end
+      nil
+    end
+  end
+end