diff --git a/fog.gemspec b/fog.gemspec
index 9bc31d434..7ed9ba1f6 100644
--- a/fog.gemspec
+++ b/fog.gemspec
@@ -46,7 +46,7 @@ Gem::Specification.new do |s|
 
   ## List your runtime dependencies here. Runtime dependencies are those
   ## that are needed for an end user to actually USE your code.
-  s.add_dependency("fog-core", "~> 1.27", ">= 1.27.1")
+  s.add_dependency("fog-core", "~> 1.27", ">= 1.27.2")
   s.add_dependency("fog-json")
   s.add_dependency("fog-xml", "~> 0.1.1")
 
diff --git a/spec/fog/account_spec.rb b/spec/fog/account_spec.rb
new file mode 100644
index 000000000..2f7652cbf
--- /dev/null
+++ b/spec/fog/account_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Account do
+  Fog::Account.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Account[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/billing_spec.rb b/spec/fog/billing_spec.rb
new file mode 100644
index 000000000..90045a5fe
--- /dev/null
+++ b/spec/fog/billing_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Billing do
+  Fog::Billing.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Billing[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/cdn_spec.rb b/spec/fog/cdn_spec.rb
new file mode 100644
index 000000000..1f3664de5
--- /dev/null
+++ b/spec/fog/cdn_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::CDN do
+  Fog::CDN.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::CDN[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/compute_spec.rb b/spec/fog/compute_spec.rb
index 89363cb99..53060081f 100644
--- a/spec/fog/compute_spec.rb
+++ b/spec/fog/compute_spec.rb
@@ -2,7 +2,19 @@ require "minitest/autorun"
 require "fog"
 
 describe Fog::Compute do
-  it "responds to []" do
-    assert_respond_to Fog::Compute, :[]
+  Fog::Compute.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          # These providers do not raise ArgumentError since they have no requirements defined
+          if [:openvz, :vmfusion].include?(provider)
+            assert Fog::Compute[provider]
+          else
+            assert_raises(ArgumentError) { Fog::Compute[provider] }
+          end
+        end
+      end
+    end
   end
 end
diff --git a/spec/fog/dns_spec.rb b/spec/fog/dns_spec.rb
new file mode 100644
index 000000000..4bb012b64
--- /dev/null
+++ b/spec/fog/dns_spec.rb
@@ -0,0 +1,20 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::DNS do
+  Fog::DNS.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          # These providers do not raise ArgumentError since they have no requirements defined
+          if [:dnsimple].include?(provider)
+            assert Fog::DNS[provider]
+          else
+            assert_raises(ArgumentError) { Fog::DNS[provider] }
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/identity_spec.rb b/spec/fog/identity_spec.rb
new file mode 100644
index 000000000..9167ead76
--- /dev/null
+++ b/spec/fog/identity_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Identity do
+  Fog::Identity.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Identity[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/image_spec.rb b/spec/fog/image_spec.rb
new file mode 100644
index 000000000..a24df98ab
--- /dev/null
+++ b/spec/fog/image_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Image do
+  Fog::Image.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Image[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/metering_spec.rb b/spec/fog/metering_spec.rb
new file mode 100644
index 000000000..30e705c90
--- /dev/null
+++ b/spec/fog/metering_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Metering do
+  Fog::Metering.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Metering[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/monitoring_spec.rb b/spec/fog/monitoring_spec.rb
new file mode 100644
index 000000000..7c3212e2d
--- /dev/null
+++ b/spec/fog/monitoring_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Monitoring do
+  Fog::Monitoring.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Monitoring[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/network_spec.rb b/spec/fog/network_spec.rb
new file mode 100644
index 000000000..d35d23a85
--- /dev/null
+++ b/spec/fog/network_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Network do
+  Fog::Network.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Network[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/orchestration_spec.rb b/spec/fog/orchestration_spec.rb
new file mode 100644
index 000000000..132110a06
--- /dev/null
+++ b/spec/fog/orchestration_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Orchestration do
+  Fog::Orchestration.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Orchestration[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/storage_spec.rb b/spec/fog/storage_spec.rb
new file mode 100644
index 000000000..8db4a36e7
--- /dev/null
+++ b/spec/fog/storage_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Storage do
+  Fog::Storage.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Storage[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/support_spec.rb b/spec/fog/support_spec.rb
new file mode 100644
index 000000000..42cb42e84
--- /dev/null
+++ b/spec/fog/support_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Support do
+  Fog::Support.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Support[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/volume_spec.rb b/spec/fog/volume_spec.rb
new file mode 100644
index 000000000..77256b829
--- /dev/null
+++ b/spec/fog/volume_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::Volume do
+  Fog::Volume.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::Volume[provider] }
+        end
+      end
+    end
+  end
+end
diff --git a/spec/fog/vpn_spec.rb b/spec/fog/vpn_spec.rb
new file mode 100644
index 000000000..e858971aa
--- /dev/null
+++ b/spec/fog/vpn_spec.rb
@@ -0,0 +1,15 @@
+require "minitest/autorun"
+require "fog"
+
+describe Fog::VPN do
+  Fog::VPN.providers.each do |provider|
+    describe "when #{provider} is passed with no available credentials" do
+      it "returns ArgumentError" do
+        # Stub credentials so you still see errors where the tester really has credentials
+        Fog.stub :credentials, {} do
+          assert_raises(ArgumentError) { Fog::VPN[provider] }
+        end
+      end
+    end
+  end
+end