Software Engineering Foundations - RSpec

Software Engineering Foundations - RSpec

Author: nmgokhale

src/Software Engineering Foundations/RSpec/Commands.txt

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+bundle exec rspec

src/Software Engineering Foundations/RSpec/exceptions.rb

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+#  begin...rescue
+# The code in the begin block will execute until an exception is reached. 
+# Once an exception is reached, the execution will immediately jump to rescue.
+
+num = 0
+begin
+    puts "dividing 10 by #{num}"
+    ans = 10/num
+    puts "the answer is #{ans}"
+rescue
+    puts "there was an error in that division"
+end
+
+puts "------------"  # dividing 10 by 0
+puts "finished"      # there was an error in that division
+                     # ------------
+                     # finished
+
+# In the event that an exception is never hit in the begin block, then execution will never go to rescue
+
+begin
+  puts "dividing 10 by #{num}"
+  ans = 10 / num
+  puts "the answer is #{ans}"
+rescue
+  puts "There was an error with that division."
+end
+
+puts "--------"
+puts "finished"
+
+# Output: 
+# dividing 10 by 5
+# the answer is 2
+# --------
+# finished
+
+# Raise an exception
+# Say your method accepts 2 string arguments. You need to raise an exception if either of them is not a string
+def format_name(first, last)
+    if !(first.instance_of?(String) && last.instance_of?(String))
+        raise "arguments must be strings"
+    end
+    first.capitalize + " " + last.capitalize
+end
+
+p format_name("NEHA", "gokhale") # "Neha Gokhale"
+# p format_name(50, "gokhale") # ./exceptions.rb:42:in `format_name': arguments must be strings (RuntimeError)
+
+
+# begin...rescue & raise
+def format_name(first, last)
+  if !(first.instance_of?(String) && last.instance_of?(String))
+    raise "arguments must be strings"
+  end
+
+  first.capitalize + " " + last.capitalize
+end
+
+first_name = 42
+last_name = "ray"
+begin
+    p format_name(first_name, last_name)
+rescue
+    # do stuff to rescue the "arguments must be strings" exception..
+    p "there was an exception :("
+end
+
+# output:
+# "Neha Gokhale"
+# "there was an exception :("
+
+

src/Software Engineering Foundations/RSpec/neha_gokhale_rspec_exercise_1.zip

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+--color
+--format documentation
+--no-fail-fast    

src/Software Engineering Foundations/RSpec/neha_gokhale_rspec_exercise_2.zip

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+source "https://rubygems.org"
+
+gem "byebug"
+gem "rspec", "~> 3.2.0"

src/Software Engineering Foundations/RSpec/rspec_demo/.rspec

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    byebug (11.0.1)
+    diff-lcs (1.3)
+    rspec (3.2.0)
+      rspec-core (~> 3.2.0)
+      rspec-expectations (~> 3.2.0)
+      rspec-mocks (~> 3.2.0)
+    rspec-core (3.2.3)
+      rspec-support (~> 3.2.0)
+    rspec-expectations (3.2.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.2.0)
+    rspec-mocks (3.2.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.2.0)
+    rspec-support (3.2.2)
+
+PLATFORMS
+  x64-mingw32
+
+DEPENDENCIES
+  byebug
+  rspec (~> 3.2.0)
+
+BUNDLED WITH
+   1.17.2

src/Software Engineering Foundations/RSpec/rspec_demo/Gemfile

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+def add(num1, num2)
+    num1 + num2
+end

src/Software Engineering Foundations/RSpec/rspec_demo/Gemfile.lock

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+def prime?(num)
+    return false if num < 2
+    (2...num).each do |divisor|
+        return false if num % divisor == 0
+    end
+    true
+end

src/Software Engineering Foundations/RSpec/rspec_demo/lib/add.rb

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+require "add"
+
+describe "add method" do
+  it "should accept two numbers as arguments" do
+    expect { add(2, 3) }.to_not raise_error
+  end
+
+  it "should return the sum of the two numbers" do
+    expect(add(2, 3)).to eq(5)
+    expect(add(10, 12)).to eq(22)
+  end
+end