fix(tests): add test case on every clients

Author: Fluf22

templates/go/tests/client/suite.mustache

@@ -75,7 +75,12 @@ func Test{{#lambda.titlecase}}{{clientPrefix}}{{testType}}{{/lambda.titlecase}}{
         require.JSONEq(t, `{{{match.parameters}}}`, string(rawBody))
       {{/matchIsJSON}}
       {{^matchIsJSON}}
+        {{#matchIsNull}}
+          require.Nil(t, res)
+        {{/matchIsNull}}
+        {{^matchIsNull}}
         require.Equal(t, `{{{match}}}`, res)
+        {{/matchIsNull}}
       {{/matchIsJSON}}
     {{/testResponse}}
   {{/match}}

templates/kotlin/tests/client/suite.mustache

@@ -62,7 +62,12 @@ class {{clientPrefix}}Test {
                   assertEquals("{{#lambda.escapeQuotes}}{{{match.parameters}}}{{/lambda.escapeQuotes}}", response)
                   {{/matchIsJSON}}
                   {{^matchIsJSON}}
+                  {{#matchIsNull}}
+                  assertNull(it)
+                  {{/matchIsNull}}
+                  {{^matchIsNull}}
                   assertEquals("{{{match}}}", it)
+                  {{/matchIsNull}}
                   {{/matchIsJSON}}
               }{{/testResponse}}
               {{/match}}

templates/ruby/tests/client/suite.mustache

@@ -43,7 +43,12 @@ class TestClient{{#lambda.pascalcase}}{{{client}}}{{/lambda.pascalcase}} < Test:
     assert_equal({{{match.parameters}}}, req.is_a?(Array) ? req.map(&:to_hash) : req.to_hash)
     {{/matchIsJSON}}
     {{^matchIsJSON}}
+    {{#matchIsNull}}
+    assert_nil(req)
+    {{/matchIsNull}}
+    {{^matchIsNull}}
     assert_equal('{{{match}}}', req)
+    {{/matchIsNull}}
     {{/matchIsJSON}}
     {{/testResponse}}
     {{/match}}

templates/scala/tests/client/suite.mustache

@@ -73,7 +73,12 @@ class {{clientPrefix}}Test extends AnyFunSuite {
     assert(write(res) == "{{#lambda.escapeQuotes}}{{{match.parameters}}}{{/lambda.escapeQuotes}}")
     {{/matchIsJSON}}
     {{^matchIsJSON}}
+    {{#matchIsNull}}
+    assert(res == null)
+    {{/matchIsNull}}
+    {{^matchIsNull}}
     assert(res == "{{{match}}}")
+    {{/matchIsNull}}
     {{/matchIsJSON}}
     {{/testResponse}}
     {{/match}}