@@ -0,0 +1,30 @@
+require_relative '../.tasks/helpers'
+
+RSpec.describe Hash do
+  describe '#recursive_merge' do
+    it 'leaves the receiver alone' do
+      main = { 'framework' => { 'version' => 1 } }
+      main.recursive_merge('framework' => { 'website' => 'first.example' })
+
+      expect(main).to eq('framework' => { 'version' => 1 })
+    end
+
+    # .tasks/db.rake merges into the same main config once per framework, so a
+    # value read here has to come from the hash passed in and from nothing else.
+    it 'does not carry a value over to the next merge' do
+      main = {}
+      first = main.recursive_merge('framework' => { 'website' => 'first.example' })
+      second = main.recursive_merge('framework' => { 'version' => 2 })
+
+      expect(first.dig('framework', 'website')).to eq('first.example')
+      expect(second.dig('framework', 'website')).to be_nil
+    end
+
+    it 'merges nested hashes' do
+      config = { 'framework' => { 'version' => 1, 'engines' => { 'node' => 'a' } } }
+
+      expect(config.recursive_merge('framework' => { 'engines' => { 'node' => 'b', 'bun' => 'c' } }))
+        .to eq('framework' => { 'version' => 1, 'engines' => { 'node' => 'b', 'bun' => 'c' } })
+    end
+  end
+end
@@ -8,7 +8,11 @@ def normalize_shell(shell)
 end
 
 class Hash
+  # Returns a new hash and leaves the receiver alone. With `merge!` the receiver
+  # kept every key it was ever merged with, so in .tasks/db.rake, where the same
+  # main config is merged once per framework, a framework whose config.yaml does
+  # not set a key got the value of the framework merged before it.
   def recursive_merge(hash)
-    merge!(hash) { |_, old, new| old.instance_of?(Hash) ? old.recursive_merge(new) : new }
+    merge(hash) { |_, old, new| old.instance_of?(Hash) ? old.recursive_merge(new) : new }
   end
 end
@@ -1,5 +1,6 @@
 framework:
   github: vlang/v
+  version: 1822cbb4b5316f433df4805bb68560fadd4df385
 
   # Install as the `vanilla` module (import vanilla.http_server). `v install <url>`
   # now namespaces by owner (~/.vmodules/enghitalo/vanilla), so clone to the
 
@@ -1,5 +1,6 @@
 framework:
   github: vlang/v
+  version: 1822cbb4b5316f433df4805bb68560fadd4df385
 
   # Install as the `vanilla` module (import vanilla.http_server). `v install <url>`
   # now namespaces by owner (~/.vmodules/enghitalo/vanilla), so clone to the
 
@@ -1,2 +1,3 @@
 framework:
   github: karlseguin/http.zig
+  version: 52eb187cff75e168316b44480cd9f0fae26a1c5e
Original file line number	Diff line number	Diff line change
`@@ -1,2 +1,3 @@`
`1`	`1`	`framework:`
`2`	`2`	`github: karlseguin/http.zig`
	`3`	`+ version: 52eb187cff75e168316b44480cd9f0fae26a1c5e`