diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0368959..59131d5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 ### Added
 
 - Unit tests for the different problem detection strategies, making sure there are no duplicate IDs and that every ID maps back to its listener
+- Unit tests for the problem filter list, covering text beginning, glob and `re:` entries as well as blank and invalid entries
 
 ### Changed
 
diff --git a/src/main/java/org/overengineer/inlineproblems/utils/ProblemTextFilter.java b/src/main/java/org/overengineer/inlineproblems/utils/ProblemTextFilter.java
index 24040c5..a52c490 100644
--- a/src/main/java/org/overengineer/inlineproblems/utils/ProblemTextFilter.java
+++ b/src/main/java/org/overengineer/inlineproblems/utils/ProblemTextFilter.java
@@ -1,6 +1,7 @@
 package org.overengineer.inlineproblems.utils;
 
 import com.intellij.openapi.diagnostic.Logger;
+import org.jetbrains.annotations.VisibleForTesting;
 import org.overengineer.inlineproblems.settings.SettingsState;
 
 import java.util.ArrayList;
@@ -44,11 +45,19 @@ private ProblemTextFilter() {
      * @return true if the problem should be ignored because it matches one of the filters
      */
     public static boolean isFiltered(String problemText) {
+        String rawFilterList = SettingsState.getInstance().getProblemFilterList();
+
+        return isFiltered(problemText, rawFilterList);
+    }
+
+    @VisibleForTesting
+    static boolean isFiltered(String problemText, String rawFilterList) {
         if (problemText == null) {
             return true;
         }
 
-        List<Predicate<String>> filters = getFilters();
+        List<Predicate<String>> filters = getFilters(rawFilterList);
+
         if (filters.isEmpty()) {
             return false;
         }
@@ -64,9 +73,7 @@ public static boolean isFiltered(String problemText) {
         return false;
     }
 
-    private static List<Predicate<String>> getFilters() {
-        String rawFilterList = SettingsState.getInstance().getProblemFilterList();
-
+    private static List<Predicate<String>> getFilters(String rawFilterList) {
         if (!Objects.equals(rawFilterList, cachedRawFilterList)) {
             cachedFilters = parse(rawFilterList);
             cachedRawFilterList = rawFilterList;
diff --git a/src/test/java/org/overengineer/inlineproblems/utils/ProblemTextFilterTest.java b/src/test/java/org/overengineer/inlineproblems/utils/ProblemTextFilterTest.java
new file mode 100644
index 0000000..614b3e2
--- /dev/null
+++ b/src/test/java/org/overengineer/inlineproblems/utils/ProblemTextFilterTest.java
@@ -0,0 +1,95 @@
+package org.overengineer.inlineproblems.utils;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ProblemTextFilterTest {
+
+    @Test
+    void prefixMatchesTextBegin() {
+        assertTrue(ProblemTextFilter.isFiltered("Field 'x' is never used", "field"));
+        assertTrue(ProblemTextFilter.isFiltered("Unused import statement", "unu"));
+        assertFalse(ProblemTextFilter.isFiltered("Field 'x' is never used", "never"));
+        assertFalse(ProblemTextFilter.isFiltered("Unused import statement", "import"));
+    }
+
+    @ParameterizedTest
+    @CsvSource({
+            "Field 'x' is never used,todo;fIELD",
+            "Unused import statement,UNU",
+            "Field 'x' is never used,re:NEVER",
+            "Unused import statement,*sTaT*;todo"
+    })
+    void caseIsIgnored(String problemText, String rawFilterList) {
+        assertTrue(ProblemTextFilter.isFiltered(problemText, rawFilterList));
+    }
+
+    @Test
+    void blankFilterTextIsIgnored() {
+        assertFalse(ProblemTextFilter.isFiltered("Unused import statement", ""));
+        assertFalse(ProblemTextFilter.isFiltered("Unused import statement", ";;"));
+        assertFalse(ProblemTextFilter.isFiltered("Unused import statement", "; ;"));
+        assertFalse(ProblemTextFilter.isFiltered("Cannot resolve method 'foo(int)'", "re:"));
+    }
+
+    @Test
+    void leadingSpacesAreIgnored() {
+        assertTrue(ProblemTextFilter.isFiltered("Field 'x' is never used", "   field"));
+        assertTrue(ProblemTextFilter.isFiltered("Unused import statement", "  *use*"));
+        assertTrue(ProblemTextFilter.isFiltered("      Unused import statement", "Unu"));
+    }
+
+    @Test
+    void globMatchesTextPattern() {
+        assertTrue(ProblemTextFilter.isFiltered("Field 'x' is never used", "fie*"));
+        assertTrue(ProblemTextFilter.isFiltered("Unused import statement", "*t st*"));
+        assertFalse(ProblemTextFilter.isFiltered("Field 'x' is never used", "field?"));
+        assertTrue(ProblemTextFilter.isFiltered("Unused import statement", "*statement"));
+    }
+
+    @Test
+    void globIgnoresRegexSymbols() {
+        assertTrue(ProblemTextFilter.isFiltered("Cannot resolve method 'foo(int)'", "*foo(int)?"));
+        assertTrue(ProblemTextFilter.isFiltered("Cannot resolve method 'foo(int)'", "*foo(*"));
+        assertTrue(ProblemTextFilter.isFiltered("'Thread.sleep()' called in loop", "*ad.sleep*"));
+        assertFalse(ProblemTextFilter.isFiltered("'Thread.sleep' called in loop", "*sleep()*"));
+        assertFalse(ProblemTextFilter.isFiltered("'ThreadXsleep()' called in loop", "*ad.sleep*"));
+    }
+
+    @Test
+    void regexMatchesTextPattern() {
+        assertTrue(ProblemTextFilter.isFiltered("'ThreadXsleep()' called in loop", "re:ad.sleep"));
+    }
+
+    @Test
+    void regexIdentifierCaseIsIgnored() {
+        assertTrue(ProblemTextFilter.isFiltered("'ThreadXsleep()' called in loop", "RE:ad.sleep"));
+    }
+
+    @Test
+    void invalidRegexIsIgnored() {
+        assertDoesNotThrow(() -> ProblemTextFilter.isFiltered("Cannot resolve method 'foo(int)'", "re:foo("));
+        assertTrue(ProblemTextFilter.isFiltered("Unused import statement", "re:imp(;unused"));
+    }
+
+    @Test
+    void nullTextIsIgnored() {
+        assertTrue(ProblemTextFilter.isFiltered(null, ";;"));
+    }
+
+    @Test
+    void nullFilterListIsIgnored() {
+        assertFalse(ProblemTextFilter.isFiltered("Unused import statement", null));
+    }
+
+    @Test
+    void changedFilterListIsApplied() {
+        assertTrue(ProblemTextFilter.isFiltered("Field 'x' is never used", "field"));
+        assertFalse(ProblemTextFilter.isFiltered("Field 'x' is never used", "*fiel"));
+        assertFalse(ProblemTextFilter.isFiltered("Field 'x' is never used", "*fiel"));
+        assertTrue(ProblemTextFilter.isFiltered("Field 'x' is never used", "field"));
+    }
+}