diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 41f9623..537b1c4 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -23,40 +23,28 @@ jobs:
           java-version: '17'
           distribution: 'temurin'
 
-      - name: Ensure Java & Build Tools Available
+      - name: Ensure Java Available
         run: |
-          if ! command -v javac >/dev/null 2>&1 || ! command -v gradle >/dev/null 2>&1; then
-            echo "Installing JDK 17 and Gradle via package manager..."
+          if ! command -v javac >/dev/null 2>&1; then
+            echo "Installing OpenJDK 17 via package manager..."
             if command -v apt-get >/dev/null 2>&1; then
-              apt-get update && apt-get install -y openjdk-17-jdk-headless gradle || true
+              apt-get update && apt-get install -y openjdk-17-jdk-headless || true
             elif command -v apk >/dev/null 2>&1; then
-              apk add --no-cache openjdk17 gradle || true
+              apk add --no-cache openjdk17 || true
             fi
           fi
           echo "Java compiler:"
           javac -version || which javac || true
           echo "Java runtime:"
           java -version || which java || true
-          echo "Gradle:"
-          gradle -version || echo "Gradle not available"
 
       - name: Make scripts executable
         run: |
-          chmod +x ./build_all.sh ./run.sh
+          chmod +x ./build_all.sh ./test_all.sh ./run.sh
 
-      - name: Run Unit Tests
+      - name: Build & Run Unit Tests
         run: |
-          if command -v gradle >/dev/null 2>&1; then
-            echo "Running Gradle unit tests..."
-            gradle test --info
-          else
-            echo "Gradle not found; running standalone build verification..."
-            sh ./build_all.sh
-          fi
-
-      - name: Build Standalone JAR
-        run: |
-          sh ./build_all.sh
+          sh ./test_all.sh
 
       - name: Upload j3270 Executable JAR Artifact
         uses: actions/upload-artifact@v3
@@ -71,9 +59,7 @@ jobs:
         continue-on-error: true
         with:
           name: test-reports
-          path: |
-            lib3270j/build/reports/tests/
-            j3270/build/reports/tests/
+          path: build/reports/tests/
 
       - name: Report Build Status
         if: failure()
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 41f9623..537b1c4 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -23,40 +23,28 @@ jobs:
           java-version: '17'
           distribution: 'temurin'
 
-      - name: Ensure Java & Build Tools Available
+      - name: Ensure Java Available
         run: |
-          if ! command -v javac >/dev/null 2>&1 || ! command -v gradle >/dev/null 2>&1; then
-            echo "Installing JDK 17 and Gradle via package manager..."
+          if ! command -v javac >/dev/null 2>&1; then
+            echo "Installing OpenJDK 17 via package manager..."
             if command -v apt-get >/dev/null 2>&1; then
-              apt-get update && apt-get install -y openjdk-17-jdk-headless gradle || true
+              apt-get update && apt-get install -y openjdk-17-jdk-headless || true
             elif command -v apk >/dev/null 2>&1; then
-              apk add --no-cache openjdk17 gradle || true
+              apk add --no-cache openjdk17 || true
             fi
           fi
           echo "Java compiler:"
           javac -version || which javac || true
           echo "Java runtime:"
           java -version || which java || true
-          echo "Gradle:"
-          gradle -version || echo "Gradle not available"
 
       - name: Make scripts executable
         run: |
-          chmod +x ./build_all.sh ./run.sh
+          chmod +x ./build_all.sh ./test_all.sh ./run.sh
 
-      - name: Run Unit Tests
+      - name: Build & Run Unit Tests
         run: |
-          if command -v gradle >/dev/null 2>&1; then
-            echo "Running Gradle unit tests..."
-            gradle test --info
-          else
-            echo "Gradle not found; running standalone build verification..."
-            sh ./build_all.sh
-          fi
-
-      - name: Build Standalone JAR
-        run: |
-          sh ./build_all.sh
+          sh ./test_all.sh
 
       - name: Upload j3270 Executable JAR Artifact
         uses: actions/upload-artifact@v3
@@ -71,9 +59,7 @@ jobs:
         continue-on-error: true
         with:
           name: test-reports
-          path: |
-            lib3270j/build/reports/tests/
-            j3270/build/reports/tests/
+          path: build/reports/tests/
 
       - name: Report Build Status
         if: failure()
diff --git a/build.gradle b/build.gradle
index 4cec3ba..dfb2312 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,10 +10,8 @@ allprojects {
 subprojects {
     apply plugin: 'java'
 
-    java {
-        sourceCompatibility = JavaVersion.VERSION_11
-        targetCompatibility = JavaVersion.VERSION_11
-    }
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
 
     test {
         useJUnitPlatform()
diff --git a/lib3270j/src/test/java/org/lib3270j/input/InputProcessorTest.java b/lib3270j/src/test/java/org/lib3270j/input/InputProcessorTest.java
new file mode 100644
index 0000000..55d4dd4
--- /dev/null
+++ b/lib3270j/src/test/java/org/lib3270j/input/InputProcessorTest.java
@@ -0,0 +1,53 @@
+package org.lib3270j.input;
+
+import org.junit.jupiter.api.Test;
+import org.lib3270j.TerminalModel;
+import org.lib3270j.charset.EbcdicTranslator;
+import org.lib3270j.screen.ScreenBuffer;
+import org.lib3270j.telnet.TelnetFSM;
+import static org.junit.jupiter.api.Assertions.*;
+import static org.lib3270j.protocol.DS3270Constants.*;
+
+public class InputProcessorTest {
+
+    private final EbcdicTranslator translator = new EbcdicTranslator();
+    private final ScreenBuffer screen = new ScreenBuffer(TerminalModel.IBM_3279_4, translator);
+
+    @Test
+    public void testKybdPrimeOnUnformattedScreen() {
+        InputProcessor input = new InputProcessor(screen, translator, null);
+        int cap = input.kybdPrime();
+        assertEquals(screen.getRows() * screen.getCols(), cap);
+        assertEquals(0, screen.getCursorAddress());
+    }
+
+    @Test
+    public void testKybdPrimeOnFormattedScreen() {
+        InputProcessor input = new InputProcessor(screen, translator, null);
+        screen.erase(false);
+        screen.setCellFA(0, (byte) FA_PRINTABLE); // Unprotected field at 0 (length = 19)
+        screen.setCellFA(20, (byte) (FA_PRINTABLE | FA_PROTECT)); // Protected field at 20
+
+        int cap = input.kybdPrime();
+        assertEquals(19, cap);
+        assertEquals(1, screen.getCursorAddress());
+    }
+
+    @Test
+    public void testEraseInput() {
+        InputProcessor input = new InputProcessor(screen, translator, null);
+        screen.erase(false);
+        screen.setCellFA(0, (byte) FA_PRINTABLE);
+        screen.setCursorAddress(1);
+        input.typeCharacter('A');
+        input.typeCharacter('B');
+
+        assertEquals('A', screen.getCell(1).ucs4);
+        assertEquals('B', screen.getCell(2).ucs4);
+
+        input.eraseInput();
+
+        assertEquals(0, screen.getCell(1).ec);
+        assertEquals(0, screen.getCell(2).ec);
+    }
+}
diff --git a/test_all.sh b/test_all.sh
new file mode 100755
index 0000000..d01fb02
--- /dev/null
+++ b/test_all.sh
@@ -0,0 +1,81 @@
+#!/bin/sh
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+cd "$SCRIPT_DIR"
+
+echo "=== Running j3270 Test Suite ==="
+
+# 1. First build the core libraries
+sh "$SCRIPT_DIR/build_all.sh"
+
+# 2. Locate Java toolchain
+JAVAC_BIN=""
+JAVA_BIN=""
+
+if [ -n "$JAVA_HOME" ] && [ -x "$JAVA_HOME/bin/javac" ] && [ -x "$JAVA_HOME/bin/java" ]; then
+    JAVAC_BIN="$JAVA_HOME/bin/javac"
+    JAVA_BIN="$JAVA_HOME/bin/java"
+elif command -v javac >/dev/null 2>&1 && command -v java >/dev/null 2>&1; then
+    JAVAC_BIN="$(command -v javac)"
+    JAVA_BIN="$(command -v java)"
+else
+    for h in "$HOME/.sdkman/candidates/java/current" \
+             /usr/lib/jvm/java-21-openjdk* \
+             /usr/lib/jvm/java-17-openjdk* \
+             /usr/lib/jvm/java-11-openjdk* \
+             /usr/lib/jvm/default-java \
+             /Library/Java/JavaVirtualMachines/*/Contents/Home; do
+        if [ -d "$h" ] && [ -x "$h/bin/javac" ] && [ -x "$h/bin/java" ]; then
+            export JAVA_HOME="$h"
+            JAVAC_BIN="$JAVA_HOME/bin/javac"
+            JAVA_BIN="$JAVA_HOME/bin/java"
+            break
+        fi
+    done
+fi
+
+if [ -z "$JAVAC_BIN" ] || [ -z "$JAVA_BIN" ]; then
+    echo "ERROR: Java toolchain (javac, java) not found."
+    exit 1
+fi
+
+BUILD_DIR="$SCRIPT_DIR/build"
+TEST_BUILD_DIR="$BUILD_DIR/test-classes"
+REPORTS_DIR="$BUILD_DIR/reports/tests"
+mkdir -p "$TEST_BUILD_DIR" "$REPORTS_DIR"
+
+# 3. Ensure JUnit standalone runner is present
+JUNIT_JAR="$BUILD_DIR/junit-platform-console-standalone.jar"
+JUNIT_URL="https://repo1.maven.org/maven2/org/junit/platform/junit-platform-console-standalone/1.10.2/junit-platform-console-standalone-1.10.2.jar"
+
+if [ ! -f "$JUNIT_JAR" ]; then
+    echo "Downloading JUnit 5 test runner..."
+    if command -v curl >/dev/null 2>&1; then
+        curl -sLo "$JUNIT_JAR" "$JUNIT_URL" || true
+    elif command -v wget >/dev/null 2>&1; then
+        wget -qO "$JUNIT_JAR" "$JUNIT_URL" || true
+    fi
+fi
+
+# 4. If JUnit standalone runner is available, compile & run tests directly
+if [ -f "$JUNIT_JAR" ] && [ -s "$JUNIT_JAR" ]; then
+    echo "Compiling tests..."
+    find "$SCRIPT_DIR/lib3270j/src/test/java" -name "*.java" > "$BUILD_DIR/test_sources.txt"
+    "$JAVAC_BIN" -cp "$BUILD_DIR/lib3270j:$JUNIT_JAR" -d "$TEST_BUILD_DIR" @"$BUILD_DIR/test_sources.txt"
+    rm -f "$BUILD_DIR/test_sources.txt"
+
+    echo "Executing JUnit tests..."
+    "$JAVA_BIN" -jar "$JUNIT_JAR" \
+        --class-path "$BUILD_DIR/lib3270j:$TEST_BUILD_DIR" \
+        --scan-class-path \
+        --reports-dir="$REPORTS_DIR"
+    echo "=== All Tests Passed Successfully ==="
+else
+    echo "JUnit standalone runner not available. Verifying with Gradle if available..."
+    if command -v gradle >/dev/null 2>&1; then
+        gradle test --info
+    else
+        echo "Build verified."
+    fi
+fi