(#15872) Add to_bytes function

Converts a string like "2 MB" to the value in bytes. Useful for
comparisons on facts that return a human readable number instead of
machine readable.

1 files changed, 58 insertions, 0 deletions

diff --git a/spec/unit/puppet/parser/functions/to_bytes_spec.rb b/spec/unit/puppet/parser/functions/to_bytes_spec.rb
new file mode 100755
index 0000000..d1ea4c8
--- /dev/null
+++ b/spec/unit/puppet/parser/functions/to_bytes_spec.rb
@@ -0,0 +1,58 @@
+#! /usr/bin/env ruby -S rspec
+
+require 'spec_helper'
+
+describe "the to_bytes function" do
+  let(:scope) { PuppetlabsSpec::PuppetInternals.scope }
+
+  it "should exist" do
+    Puppet::Parser::Functions.function("to_bytes").should == "function_to_bytes"
+  end
+
+  it "should raise a ParseError if there is less than 1 arguments" do
+    lambda { scope.function_to_bytes([]) }.should( raise_error(Puppet::ParseError))
+  end
+
+  it "should convert kB to B" do
+    result = scope.function_to_bytes(["4 kB"])
+    result.should(eq(4096))
+  end
+
+  it "should work without B in unit" do
+    result = scope.function_to_bytes(["4 k"])
+    result.should(eq(4096))
+  end
+
+  it "should work without a space before unit" do
+    result = scope.function_to_bytes(["4k"])
+    result.should(eq(4096))
+  end
+
+  it "should work without a unit" do
+    result = scope.function_to_bytes(["5678"])
+    result.should(eq(5678))
+  end
+
+  it "should convert fractions" do
+    result = scope.function_to_bytes(["1.5 kB"])
+    result.should(eq(1536))
+  end
+
+  it "should convert scientific notation" do
+    result = scope.function_to_bytes(["1.5e2 B"])
+    result.should(eq(150))
+  end
+
+  it "should do nothing with a positive number" do
+    result = scope.function_to_bytes([5678])
+    result.should(eq(5678))
+  end
+
+  it "should should raise a ParseError if input isn't a number" do
+    lambda { scope.function_to_bytes(["foo"]) }.should( raise_error(Puppet::ParseError))
+  end
+
+  it "should should raise a ParseError if prefix is unknown" do
+    lambda { scope.function_to_bytes(["5 uB"]) }.should( raise_error(Puppet::ParseError))
+  end
+end