Rename database client files to put them in a `Client` module

Will be modifying the class names in the next commit. Here we change the
file names & locations of the database client files.

The format changes thusly:

    <adapter>_client.rb -> client/<adapter>.rb

This organisation feels cleaner to me. Wasn't liking the previous
structure.

1 files changed, 26 insertions, 0 deletions

diff --git a/spec/dbshell/client/database_spec.rb b/spec/dbshell/client/database_spec.rb
new file mode 100644
index 0000000..1659fa3
--- /dev/null
+++ b/spec/dbshell/client/database_spec.rb
@@ -0,0 +1,26 @@
+require 'minitest/autorun'
+require 'dbshell/database_client'
+
+describe DBShell::DatabaseClient do
+  describe ".handler" do
+    it "handles SQLite3" do
+      DBShell::DatabaseClient.handler({
+        'adapter' => 'sqlite3'
+      }).must_equal(DBShell::Sqlite3Client)
+    end
+
+    it "handles Postgres" do
+      DBShell::DatabaseClient.handler({
+        'adapter' => 'postgresql'
+      }).must_equal(DBShell::PostgresClient)
+    end
+
+    it "raises an error if no suitable adapter is found" do
+      proc do
+        DBShell::DatabaseClient.handler({
+          'adapter' => 'sybil_system'
+        })
+      end.must_raise(DBShell::InvalidDatabaseAdapter)
+    end
+  end
+end