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Versions: 12
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Stored size: 1.71 KB
Contents
require 'rspec' # Use the RSpec framework
require_relative '../calc_parser' # Load the class under test
require_relative '../calc_ast_builder'
describe 'Calculator' do
def parse_expression(anExpression)
# Create a calculator parser object
parser = CalcParser.new
result = parser.parse_expression(anExpression)
unless result.success?
# Stop if the parse failed...
puts "Parsing of '#{anExpression}' failed"
puts "Reason: #{result.failure_reason.message}"
exit(1)
end
return result
end
def build_ast(aParseResult)
tree_builder = CalcASTBuilder
# Generate an abstract syntax tree from the parse result
ast = aParseResult.parse_tree(tree_builder)
return ast.root
end
def expect_expr(anExpression)
parsing = parse_expression(anExpression)
ast = build_ast(parsing)
return expect(ast.interpret)
end
it 'should evaluate simple number literals' do
expect_expr('2').to eq(2)
end
it 'should evaluate addition' do
expect_expr('2 + 2').to eq(4)
end
it 'should evaluate subtraction' do
expect_expr('2.1 - 2').to be_within(0.000000000000001).of(0.1)
end
it 'should evaluate division' do
expect_expr('10.5 / 5').to eq(2.1)
end
it 'should evaluate multiplication' do
expect_expr('2 * 3.1').to eq(6.2)
end
it 'should evaluate parentheses' do
expect_expr('2 * (2.1 + 1)').to eq(6.2)
end
it 'should evaluate regardless of whitespace' do
expect_expr("2*(1+\t1)").to eq(4)
end
it 'should evaluate order of operations' do
expect_expr('2 * 2.1 + 1 / 2').to eq 4.7
end
it 'should evaluate multiple levels of parentheses' do
expect_expr('2*(1/(1+3))').to eq(0.5)
end
end # describe
# End of file
Version data entries
12 entries across 12 versions & 1 rubygems