diff --git a/.github/workflows/check_lesson_15_java_pr.yaml b/.github/workflows/check_lesson_15_java_pr.yaml
new file mode 100644
index 00000000..0d5385a2
--- /dev/null
+++ b/.github/workflows/check_lesson_15_java_pr.yaml
@@ -0,0 +1,35 @@
+name: Check Lesson 15 Java Pull Request
+
+on:
+  pull_request:
+    branches: [ "main" ]
+    paths:
+      - "lesson_15/tdd/**"
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    - name: Build Lesson 15 with Java
+      working-directory: ./lesson_15/tdd
+      run: ./gradlew check
+
+    - name: Add coverage to PR
+      id: jacoco
+      uses: madrapps/jacoco-report@v1.7.1
+      with:
+        paths: ./lesson_15/tdd/tdd_app/build/reports/jacoco/test/jacocoTestReport.xml
+        token: ${{ secrets.GITHUB_TOKEN }}
\ No newline at end of file
diff --git a/.github/workflows/check_push.yml b/.github/workflows/check_push.yml
index da8f8b81..e9b006de 100644
--- a/.github/workflows/check_push.yml
+++ b/.github/workflows/check_push.yml
@@ -122,3 +122,7 @@ jobs:
     - name: Build Lesson 14 with Java
       working-directory: ./lesson_14/exceptions
       run: ./gradlew assemble
+
+    - name: Build Lesson 15 with Java
+      working-directory: ./lesson_15/tdd
+      run: ./gradlew check
diff --git a/lesson_15/README.md b/lesson_15/README.md
index 8afe2a93..a48aefc0 100644
--- a/lesson_15/README.md
+++ b/lesson_15/README.md
@@ -9,4 +9,14 @@ Please review the following resources before lecture:
 
 ## Homework
 
-TODO(anthonydmays): You know the drill
\ No newline at end of file
+- [ ] Complete [Unit Testing](#unit-testing) assignment.
+- [ ] Do pre-work for [lesson 16](/lesson_16/).
+
+### Unit Testing
+
+For the code in the Lesson 15 app, you will write tests in the [unit tests project][unit-tests-link]. You must achieve a code coverage of 80% or more. The coverage report can be viewed at [./tdd/tdd_app/build/reports/jacoco/test/html/index.html][coverage-report] after running `./gradlew check` or `./gradlew jacocoTestReport`.
+
+In addition to writing unit tests, you will need to implement a new method on the `Employee` class called `getDetails` that returns a string describing the employee using the Test-Driven Development methodology.
+
+[coverage-report]: ./tdd/tdd_app/build/reports/jacoco/test/html/index.html
+[unit-tests-link]: ./tdd/tdd_app/src/test/java/com/codedifferently/lesson15/
\ No newline at end of file
diff --git a/lesson_15/tdd/.gitattributes b/lesson_15/tdd/.gitattributes
new file mode 100644
index 00000000..097f9f98
--- /dev/null
+++ b/lesson_15/tdd/.gitattributes
@@ -0,0 +1,9 @@
+#
+# https://help.github.com/articles/dealing-with-line-endings/
+#
+# Linux start script should use lf
+/gradlew        text eol=lf
+
+# These are Windows script files and should use crlf
+*.bat           text eol=crlf
+
diff --git a/lesson_15/tdd/.gitignore b/lesson_15/tdd/.gitignore
new file mode 100644
index 00000000..1b6985c0
--- /dev/null
+++ b/lesson_15/tdd/.gitignore
@@ -0,0 +1,5 @@
+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
diff --git a/lesson_15/tdd/gradle/wrapper/gradle-wrapper.jar b/lesson_15/tdd/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 00000000..ccebba77
Binary files /dev/null and b/lesson_15/tdd/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/lesson_15/tdd/gradle/wrapper/gradle-wrapper.properties b/lesson_15/tdd/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 00000000..5c40527d
--- /dev/null
+++ b/lesson_15/tdd/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.2-bin.zip
+networkTimeout=10000
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/lesson_15/tdd/gradlew b/lesson_15/tdd/gradlew
new file mode 100755
index 00000000..79a61d42
--- /dev/null
+++ b/lesson_15/tdd/gradlew
@@ -0,0 +1,244 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/lesson_15/tdd/gradlew.bat b/lesson_15/tdd/gradlew.bat
new file mode 100644
index 00000000..93e3f59f
--- /dev/null
+++ b/lesson_15/tdd/gradlew.bat
@@ -0,0 +1,92 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/lesson_15/tdd/settings.gradle.kts b/lesson_15/tdd/settings.gradle.kts
new file mode 100644
index 00000000..3c3c422e
--- /dev/null
+++ b/lesson_15/tdd/settings.gradle.kts
@@ -0,0 +1,13 @@
+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * The settings file is used to specify which projects to include in your build.
+ *
+ * Detailed information about configuring a multi-project build in Gradle can be found
+ * in the user manual at https://docs.gradle.org/8.0.2/userguide/multi_project_builds.html
+ */
+
+includeBuild("../../lib/java/codedifferently-instructional")
+
+rootProject.name = "lesson_15"
+include("tdd_app")
diff --git a/lesson_15/tdd/tdd_app/build.gradle.kts b/lesson_15/tdd/tdd_app/build.gradle.kts
new file mode 100644
index 00000000..9f547bc0
--- /dev/null
+++ b/lesson_15/tdd/tdd_app/build.gradle.kts
@@ -0,0 +1,86 @@
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    application
+    eclipse
+    jacoco
+    id("com.diffplug.spotless") version "6.25.0"
+	  id("org.springframework.boot") version "3.2.2"
+    id("com.adarshr.test-logger") version "4.0.0"
+}
+
+apply(plugin = "io.spring.dependency-management")
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // Use JUnit Jupiter for testing.
+    testImplementation("com.codedifferently.instructional:instructional-lib")
+    testImplementation("org.junit.jupiter:junit-jupiter:5.9.1")
+    testImplementation("org.springframework.boot:spring-boot-starter-test")
+    testImplementation("org.assertj:assertj-core:3.25.1")
+    testImplementation("at.favre.lib:bcrypt:0.10.2")
+
+    // This dependency is used by the application.
+    implementation("com.codedifferently.instructional:instructional-lib")
+    implementation("com.google.guava:guava:31.1-jre")
+    implementation("com.google.code.gson:gson:2.10.1")
+    implementation("org.projectlombok:lombok:1.18.30")
+    implementation("org.springframework.boot:spring-boot-starter")
+}
+
+application {
+    // Define the main class for the application.
+    mainClass.set("com.codedifferently.lesson15.Lesson15")
+}
+
+tasks.named<Test>("test") {
+    // Use JUnit Platform for unit tests.
+    useJUnitPlatform()
+    finalizedBy(tasks.jacocoTestReport)
+}
+
+tasks.jacocoTestReport {
+  dependsOn(tasks.test)
+  reports {
+    xml.required = true
+  }
+}
+
+tasks.jacocoTestCoverageVerification {
+  violationRules {
+    rule {
+      limit {
+        minimum = "0.8".toBigDecimal()
+      }
+    }
+  }
+}
+
+tasks.check {
+	dependsOn(tasks.jacocoTestCoverageVerification)
+}
+
+configure<com.diffplug.gradle.spotless.SpotlessExtension> {
+
+  format("misc", {
+    // define the files to apply `misc` to
+    target("*.gradle", ".gitattributes", ".gitignore")
+
+    // define the steps to apply to those files
+    trimTrailingWhitespace()
+    indentWithTabs() // or spaces. Takes an integer argument if you don't like 4
+    endWithNewline()
+  })
+
+  java {
+    // don't need to set target, it is inferred from java
+
+    // apply a specific flavor of google-java-format
+    googleJavaFormat()
+    // fix formatting of type annotations
+    formatAnnotations()
+  }
+}
diff --git a/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java
new file mode 100644
index 00000000..49aaabbd
--- /dev/null
+++ b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java
@@ -0,0 +1,48 @@
+package com.codedifferently.lesson15;
+
+public class Employee {
+  private int id;
+  private String name;
+  private String department;
+  private double salary;
+
+  public Employee(int id, String name, String department, double salary) {
+    this.id = id;
+    this.name = name;
+    this.department = department;
+    this.salary = salary;
+  }
+
+  // Getters and setters
+  public int getId() {
+    return id;
+  }
+
+  public void setId(int id) {
+    this.id = id;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public void setName(String name) {
+    this.name = name;
+  }
+
+  public String getDepartment() {
+    return department;
+  }
+
+  public void setDepartment(String department) {
+    this.department = department;
+  }
+
+  public double getSalary() {
+    return salary;
+  }
+
+  public void setSalary(double salary) {
+    this.salary = salary;
+  }
+}
diff --git a/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/EmployeeManager.java b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/EmployeeManager.java
new file mode 100644
index 00000000..66337295
--- /dev/null
+++ b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/EmployeeManager.java
@@ -0,0 +1,32 @@
+package com.codedifferently.lesson15;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class EmployeeManager {
+  private Map<Integer, Employee> employees;
+
+  public EmployeeManager() {
+    employees = new HashMap<>();
+  }
+
+  public void addEmployee(Employee employee) {
+    employees.put(employee.getId(), employee);
+  }
+
+  public Employee getEmployee(int id) {
+    return employees.get(id);
+  }
+
+  public void updateEmployee(Employee employee) {
+    employees.put(employee.getId(), employee);
+  }
+
+  public void removeEmployee(int id) {
+    employees.remove(id);
+  }
+
+  public int getEmployeeCount() {
+    return employees.size();
+  }
+}
diff --git a/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Lesson15.java b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Lesson15.java
new file mode 100644
index 00000000..eaf8ba77
--- /dev/null
+++ b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Lesson15.java
@@ -0,0 +1,8 @@
+package com.codedifferently.lesson15;
+
+public class Lesson15 {
+
+  public static void main(String[] args) {
+    System.out.println("Hello, World!");
+  }
+}
diff --git a/lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java b/lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java
new file mode 100644
index 00000000..cd6ef511
--- /dev/null
+++ b/lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java
@@ -0,0 +1,19 @@
+package com.codedifferently.lesson15;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+class Lesson15Test {
+
+  @Test
+  public void testLesson15() {
+    assertThat(new Lesson15()).isNotNull();
+  }
+
+  @Test
+  public void testGetGreeting() {
+    // Act
+    Lesson15.main(null);
+  }
+}
diff --git a/lesson_16/README.md b/lesson_16/README.md
new file mode 100644
index 00000000..8e3346f5
--- /dev/null
+++ b/lesson_16/README.md
@@ -0,0 +1,13 @@
+# Lesson 16: OOP Principles, Part I
+
+## Pre-work
+
+Please review the following resources before lecture:
+
+* [Java Classes & Objects (Video)](https://www.youtube.com/watch?v=IUqKuGNasdM)
+* [TypeScript Tutorial #12 - Classes](https://www.youtube.com/watch?v=OsFwOzr3_sE)
+* [TypeScript Tutorial #13 - Public, Private & Readonly (Video)](https://www.youtube.com/watch?v=aYmnwDlPB8s)
+
+## Homework
+
+TODO(anthonydmays): Add details
\ No newline at end of file