Test conditionals

spec/ast/conditional_spec.rb

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+RSpec.describe AST::Conditional do
+  it 'evaluates a true if statement' do
+    expect(
+      AST::Conditional.new(
+        [
+          AST::Branch.new(
+            AST::Binary.new(
+              AST::Operators::GREATER_THAN,
+              AST::Number.new(5.0),
+              AST::Number.new(4.0),
+            ),
+            AST::Block.new(
+              [
+                AST::String.new("5 is greater than 4")
+              ]
+            )
+          )
+        ]
+      ).execute(Environment.new)
+    ).to eq("5 is greater than 4")
+  end
+
+  it 'evaluates an else statement' do
+    expect(
+      AST::Conditional.new(
+        [
+          AST::Branch.new(
+            AST::Binary.new(
+              AST::Operators::GREATER_THAN,
+              AST::Number.new(3.0),
+              AST::Number.new(4.0),
+            ),
+            AST::Block.new(
+              [
+                AST::String.new("3 is greater than 4")
+              ]
+            )
+          ),
+          AST::Branch.new(
+            AST::Boolean.new(true),
+            AST::Block.new(
+              [
+                AST::String.new("3 is _not_ greater than 4")
+              ]
+            )
+          )
+        ]
+      ).execute(Environment.new)
+    ).to eq("3 is _not_ greater than 4")
+  end
+
+  it 'evaluates an else if statement' do
+    expect(
+      AST::Conditional.new(
+        [
+          AST::Branch.new(
+            AST::Binary.new(
+              AST::Operators::GREATER_THAN,
+              AST::Number.new(3.0),
+              AST::Number.new(4.0),
+            ),
+            AST::Block.new(
+              [
+                AST::String.new("3 is greater than 4")
+              ]
+            )
+          ),
+          AST::Branch.new(
+            AST::Binary.new(
+              AST::Operators::GREATER_THAN,
+              AST::Number.new(3.0),
+              AST::Number.new(2.0),
+            ),
+            AST::Block.new(
+              [
+                AST::String.new("3 is greater than 2")
+              ]
+            )
+          ),
+          AST::Branch.new(
+            AST::Boolean.new(true),
+            AST::Block.new(
+              [
+                AST::String.new("3 is _not_ greater than 4")
+              ]
+            )
+          )
+        ]
+      ).execute(Environment.new)
+    ).to eq("3 is greater than 2")
+  end
+end