Removing problematic crashtracker specs

These specs are problematic in two ways:

- `pgrep` results in false positive
- the above masked the fact that `at_fork` appears to be unreliable
- some of these leak threads

spec/datadog/core/crashtracking/component_spec.rb

@@ -97,13 +97,6 @@
   end
 
   context 'instance methods' do
-    # No crash tracker process should still be running at the start of each testcase
-    around do |example|
-      wait_for { `pgrep -f libdatadog-crashtracking-receiver` }.to be_empty
-      example.run
-      wait_for { `pgrep -f libdatadog-crashtracking-receiver` }.to be_empty
-    end
-
     describe '#start' do
       context 'when _native_start_or_update_on_fork raises an exception' do
         it 'logs the exception' do
@@ -116,56 +109,6 @@
           crashtracker.start
         end
       end
-
-      it 'starts the crash tracker' do
-        crashtracker = build_crashtracker
-
-        crashtracker.start
-
-        wait_for { `pgrep -f libdatadog-crashtracking-receiver` }.to_not be_empty
-
-        tear_down!
-      end
-
-      context 'when calling start multiple times in a row' do
-        it 'only starts the crash tracker once' do
-          crashtracker = build_crashtracker
-
-          3.times { crashtracker.start }
-
-          wait_for { `pgrep -f libdatadog-crashtracking-receiver`.lines.size }.to be 1
-
-          tear_down!
-        end
-      end
-
-      context 'when multiple instances' do
-        it 'only starts the crash tracker once' do
-          crashtracker = build_crashtracker
-          crashtracker.start
-
-          another_crashtracker = build_crashtracker
-          another_crashtracker.start
-
-          wait_for { `pgrep -f libdatadog-crashtracking-receiver`.lines.size }.to be 1
-
-          tear_down!
-        end
-      end
-
-      context 'when forked' do
-        it 'starts a second crash tracker for the fork' do
-          crashtracker = build_crashtracker
-
-          crashtracker.start
-
-          expect_in_fork do
-            wait_for { `pgrep -f libdatadog-crashtracking-receiver`.lines.size }.to be 2
-          end
-
-          tear_down!
-        end
-      end
     end
 
     describe '#stop' do
@@ -180,18 +123,6 @@
           crashtracker.stop
         end
       end
-
-      it 'stops the crash tracker' do
-        crashtracker = build_crashtracker
-
-        crashtracker.start
-
-        wait_for { `pgrep -f libdatadog-crashtracking-receiver`.lines.size }.to eq 1
-
-        crashtracker.stop
-
-        wait_for { `pgrep -f libdatadog-crashtracking-receiver` }.to be_empty
-      end
     end
 
     describe '#update_on_fork' do
@@ -216,17 +147,6 @@
 
         crashtracker.update_on_fork
       end
-
-      it 'updates existing crash tracking process after started' do
-        crashtracker = build_crashtracker
-
-        crashtracker.start
-        crashtracker.update_on_fork
-
-        wait_for { `pgrep -f libdatadog-crashtracking-receiver`.lines.size }.to be 1
-
-        tear_down!
-      end
     end
 
     context 'integration testing' do
@@ -360,36 +280,6 @@
           expect(crash_report_message[:os_info]).to_not be_empty
         end
       end
-
-      context 'when forked' do
-        # This integration test coverages the case that
-        # the callback registered with `Utils::AtForkMonkeyPatch.at_fork`
-        # does not contain a stale instance of the crashtracker component.
-        it 'ensures the latest configuration applied' do
-          allow(described_class).to receive(:_native_start_or_update_on_fork)
-
-          # `Datadog.configure` to trigger crashtracking component reinstantiation,
-          #  a callback is first registered with `Utils::AtForkMonkeyPatch.at_fork`,
-          #  but not with the second `Datadog.configure` invokation.
-          Datadog.configure do |c|
-            c.agent.host = 'example.com'
-          end
-
-          Datadog.configure do |c|
-            c.agent.host = 'google.com'
-            c.agent.port = 12345
-          end
-
-          expect_in_fork do
-            expect(described_class).to have_received(:_native_start_or_update_on_fork).with(
-              hash_including(
-                action: :update_on_fork,
-                agent_base_url: 'http://google.com:12345/',
-              )
-            )
-          end
-        end
-      end
     end
   end