diff --git a/test/spec/components/Feel.spec.js b/test/spec/components/Feel.spec.js
index 90ee5cd2..0623e6b4 100644
--- a/test/spec/components/Feel.spec.js
+++ b/test/spec/components/Feel.spec.js
@@ -189,11 +189,7 @@ describe('<FeelField>', function() {
       it('should set valid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => null;
 
         const result = createFeelField({ container, validate });
 
@@ -212,11 +208,7 @@ describe('<FeelField>', function() {
       it('should set invalid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelField({ container, validate });
 
@@ -234,11 +226,7 @@ describe('<FeelField>', function() {
       it('should keep showing invalid value', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelField({ container, validate });
 
@@ -256,11 +244,7 @@ describe('<FeelField>', function() {
       it('should show error message', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelField({ container, validate });
 
@@ -282,11 +266,7 @@ describe('<FeelField>', function() {
 
         // given
         const setValueSpy = sinon.spy();
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelField({ container, validate, setValue: setValueSpy });
 
@@ -691,11 +671,7 @@ describe('<FeelField>', function() {
       it('should set valid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 3) {
-            return 'error';
-          }
-        };
+        const validate = () => null;
 
         const result = createFeelNumber({ container, validate });
 
@@ -714,11 +690,7 @@ describe('<FeelField>', function() {
       it('should set invalid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 3) {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelNumber({ container, validate });
 
@@ -736,11 +708,7 @@ describe('<FeelField>', function() {
       it('should keep showing invalid value', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 3) {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelNumber({ container, validate });
 
@@ -758,11 +726,7 @@ describe('<FeelField>', function() {
       it('should show error message', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 3) {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelNumber({ container, validate });
 
@@ -784,11 +748,7 @@ describe('<FeelField>', function() {
 
         // given
         const setValueSpy = sinon.spy();
-        const validate = (v) => {
-          if (v === 3) {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelNumber({ container, validate, setValue: setValueSpy });
 
@@ -1151,11 +1111,7 @@ describe('<FeelField>', function() {
       it('should set valid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => null;
 
         const result = createFeelTextArea({ container, validate });
 
@@ -1174,11 +1130,7 @@ describe('<FeelField>', function() {
       it('should set invalid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelTextArea({ container, validate });
 
@@ -1196,11 +1148,7 @@ describe('<FeelField>', function() {
       it('should keep showing invalid value', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelTextArea({ container, validate });
 
@@ -1218,11 +1166,7 @@ describe('<FeelField>', function() {
       it('should show error message', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelTextArea({ container, validate });
 
@@ -1244,11 +1188,7 @@ describe('<FeelField>', function() {
 
         // given
         const setValueSpy = sinon.spy();
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelTextArea({ container, validate, setValue: setValueSpy });
 
@@ -2013,11 +1953,7 @@ describe('<FeelField>', function() {
       it('should set valid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => null;
 
         const result = createFeelField({ container, validate, feel: 'required' });
 
@@ -2038,11 +1974,7 @@ describe('<FeelField>', function() {
       it('should set invalid', async function() {
 
         // given
-        const validate = (v) => {
-          if (v === '=bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelField({ container, validate, feel: 'required' });
 
@@ -2065,11 +1997,7 @@ describe('<FeelField>', function() {
       it('should keep showing invalid value', function() {
 
         // given
-        const validate = (v) => {
-          if (v === '=bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelField({ container, validate, feel: 'required' });
 
@@ -2089,11 +2017,7 @@ describe('<FeelField>', function() {
       it('should show error message', async function() {
 
         // given
-        const validate = (v) => {
-          if (v === '=bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelField({ container, validate, feel: 'required' });
 
@@ -2119,11 +2043,7 @@ describe('<FeelField>', function() {
 
         // given
         const setValueSpy = sinon.spy();
-        const validate = (v) => {
-          if (v === '=bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createFeelTextArea({ container, validate, setValue: setValueSpy, feel: 'required' });
 
diff --git a/test/spec/components/NumberField.spec.js b/test/spec/components/NumberField.spec.js
index f5bf98bc..efcef73f 100644
--- a/test/spec/components/NumberField.spec.js
+++ b/test/spec/components/NumberField.spec.js
@@ -208,11 +208,7 @@ describe('<NumberField>', function() {
     it('should set valid', function() {
 
       // given
-      const validate = (v) => {
-        if (v % 2 !== 0) {
-          return 'should be even';
-        }
-      };
+      const validate = () => null;
 
       const result = createNumberField({ container, validate });
 
@@ -221,7 +217,7 @@ describe('<NumberField>', function() {
       const input = domQuery('.bio-properties-panel-input', entry);
 
       // when
-      changeInput(input, 2);
+      changeInput(input, 1);
 
       // then
       expect(isValid(entry)).to.be.true;
@@ -231,11 +227,7 @@ describe('<NumberField>', function() {
     it('should set invalid', function() {
 
       // given
-      const validate = (v) => {
-        if (v % 2 !== 0) {
-          return 'should be even';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createNumberField({ container, validate });
 
@@ -243,7 +235,7 @@ describe('<NumberField>', function() {
       const input = domQuery('.bio-properties-panel-input', entry);
 
       // when
-      changeInput(input, 3);
+      changeInput(input, 1);
 
       // then
       expect(isValid(entry)).to.be.false;
@@ -253,11 +245,7 @@ describe('<NumberField>', function() {
     it('should keep showing invalid value', function() {
 
       // given
-      const validate = (v) => {
-        if (v % 2 !== 0) {
-          return 'should be even';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createNumberField({ container, validate });
 
@@ -265,21 +253,17 @@ describe('<NumberField>', function() {
       const input = domQuery('.bio-properties-panel-input', entry);
 
       // when
-      changeInput(input, 3);
+      changeInput(input, 1);
 
       // then
-      expect(input.value).to.eql('3');
+      expect(input.value).to.eql('1');
     });
 
 
     it('should show error message', function() {
 
       // given
-      const validate = (v) => {
-        if (v % 2 !== 0) {
-          return 'should be even';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createNumberField({ container, validate });
 
@@ -287,24 +271,20 @@ describe('<NumberField>', function() {
       const input = domQuery('.bio-properties-panel-input', entry);
 
       // when
-      changeInput(input, 3);
+      changeInput(input, 1);
 
       const error = domQuery('.bio-properties-panel-error', entry);
 
       // then
       expect(error).to.exist;
-      expect(error.innerText).to.eql('should be even');
+      expect(error.innerText).to.eql('error');
     });
 
 
     it('should pass error to `setValue`', function() {
 
       // given
-      const validate = (v) => {
-        if (v % 2 !== 0) {
-          return 'should be even';
-        }
-      };
+      const validate = () => 'error';
 
       const setValueSpy = sinon.spy();
 
@@ -315,7 +295,7 @@ describe('<NumberField>', function() {
       changeInput(entry, 1);
 
       // then
-      expect(setValueSpy).to.have.been.calledWith(1, 'should be even');
+      expect(setValueSpy).to.have.been.calledWith(1, 'error');
     });
 
   });
diff --git a/test/spec/components/Select.spec.js b/test/spec/components/Select.spec.js
index 0fd30fc4..cce52375 100644
--- a/test/spec/components/Select.spec.js
+++ b/test/spec/components/Select.spec.js
@@ -323,11 +323,7 @@ describe('<Select>', function() {
     it('should set valid', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'A') {
-          return 'error';
-        }
-      };
+      const validate = () => null;
 
       const getOptions = () => createOptions();
 
@@ -338,7 +334,7 @@ describe('<Select>', function() {
 
 
       // when
-      changeInput(select, 'B');
+      changeInput(select, 'A');
 
       // then
       expect(isValid(entry)).to.be.true;
@@ -348,11 +344,7 @@ describe('<Select>', function() {
     it('should set invalid', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'A') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const getOptions = () => createOptions();
 
@@ -372,11 +364,7 @@ describe('<Select>', function() {
     it('should keep showing invalid value', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'A') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const getOptions = () => createOptions();
 
@@ -396,11 +384,7 @@ describe('<Select>', function() {
     it('should show error message', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'A') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const getOptions = () => createOptions();
 
@@ -424,11 +408,7 @@ describe('<Select>', function() {
 
       // given
       const setValueSpy = sinon.spy();
-      const validate = (v) => {
-        if (v === 'A') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
       const getOptions = () => createOptions();
 
       const result = createSelect({ container, validate, getOptions, setValue: setValueSpy });
diff --git a/test/spec/components/Templating.spec.js b/test/spec/components/Templating.spec.js
index a1e9e0ee..97787f8f 100644
--- a/test/spec/components/Templating.spec.js
+++ b/test/spec/components/Templating.spec.js
@@ -295,11 +295,7 @@ describe('<Templating>', function() {
       it('should set valid', function() {
 
         // given
-        const validate = (v) => {
-          if (v === '{{bar}}') {
-            return 'error';
-          }
-        };
+        const validate = () => null;
 
         const result = createTemplatingEntry({ container, validate });
 
@@ -320,11 +316,7 @@ describe('<Templating>', function() {
       it('should set invalid', async function() {
 
         // given
-        const validate = (v) => {
-          if (v === '{{bar}}') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createTemplatingEntry({ container, validate });
 
@@ -344,11 +336,7 @@ describe('<Templating>', function() {
       it('should keep showing invalid value', function() {
 
         // given
-        const validate = (v) => {
-          if (v === '{{bar}}') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createTemplatingEntry({ container, validate });
 
@@ -368,11 +356,7 @@ describe('<Templating>', function() {
       it('should show error message', async function() {
 
         // given
-        const validate = (v) => {
-          if (v === 'bar') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createTemplatingEntry({ container, validate });
 
@@ -395,11 +379,7 @@ describe('<Templating>', function() {
 
         // given
         const setValueSpy = sinon.spy();
-        const validate = (v) => {
-          if (v === '{{bar}}') {
-            return 'error';
-          }
-        };
+        const validate = () => 'error';
 
         const result = createTemplatingEntry({ container, validate, setValue: setValueSpy });
 
diff --git a/test/spec/components/TextArea.spec.js b/test/spec/components/TextArea.spec.js
index 4f8ac647..9e82d7f1 100644
--- a/test/spec/components/TextArea.spec.js
+++ b/test/spec/components/TextArea.spec.js
@@ -309,11 +309,7 @@ describe('<TextArea>', function() {
     it('should set valid', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => null;
 
       const result = createTextArea({ container, validate });
 
@@ -332,11 +328,7 @@ describe('<TextArea>', function() {
     it('should set invalid', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextArea({ container, validate });
 
@@ -354,11 +346,7 @@ describe('<TextArea>', function() {
     it('should keep showing invalid value', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextArea({ container, validate });
 
@@ -376,11 +364,7 @@ describe('<TextArea>', function() {
     it('should show error message', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextArea({ container, validate });
 
@@ -397,15 +381,12 @@ describe('<TextArea>', function() {
       expect(error.innerText).to.eql('error');
     });
 
+
     it('should set invalid', function() {
 
       // given
       const setValueSpy = sinon.spy();
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextArea({ container, validate, setValue: setValueSpy });
 
diff --git a/test/spec/components/TextField.spec.js b/test/spec/components/TextField.spec.js
index 54a02d03..d942bb38 100644
--- a/test/spec/components/TextField.spec.js
+++ b/test/spec/components/TextField.spec.js
@@ -188,11 +188,7 @@ describe('<TextField>', function() {
     it('should set valid', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => null;
 
       const result = createTextField({ container, validate });
 
@@ -211,11 +207,7 @@ describe('<TextField>', function() {
     it('should set invalid', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextField({ container, validate });
 
@@ -233,11 +225,7 @@ describe('<TextField>', function() {
     it('should keep showing invalid value', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextField({ container, validate });
 
@@ -255,11 +243,7 @@ describe('<TextField>', function() {
     it('should show error message', function() {
 
       // given
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextField({ container, validate });
 
@@ -281,11 +265,7 @@ describe('<TextField>', function() {
 
       // given
       const setValueSpy = sinon.spy();
-      const validate = (v) => {
-        if (v === 'bar') {
-          return 'error';
-        }
-      };
+      const validate = () => 'error';
 
       const result = createTextField({ container, validate, setValue: setValueSpy });