commit aabda6aafbdbd69333025f72d2c5d0f428760576 Author: Joshua Sigona Date: Thu Aug 6 03:52:59 2020 +0900 Implement core features diff --git a/bin/.gitignore b/bin/.gitignore new file mode 100644 index 0000000..7ac70cd --- /dev/null +++ b/bin/.gitignore @@ -0,0 +1,3 @@ +/main/ +/test/ +/default/ diff --git a/build.gradle b/build.gradle new file mode 100644 index 0000000..8218fef --- /dev/null +++ b/build.gradle @@ -0,0 +1,26 @@ +plugins { + id 'org.springframework.boot' version '2.3.1.RELEASE' + id 'io.spring.dependency-management' version '1.0.9.RELEASE' + id 'java' +} + +group = 'com.example' +version = '0.0.1-SNAPSHOT' +sourceCompatibility = '1.8' + +repositories { + mavenCentral() +} + +dependencies { + implementation 'org.springframework.boot:spring-boot-starter-web' + testImplementation('org.springframework.boot:spring-boot-starter-test') { + exclude group: 'org.junit.vintage', module: 'junit-vintage-engine' + } + compile('org.springframework.boot:spring-boot-starter-data-jpa:2.0.0.RELEASE') + runtime('mysql:mysql-connector-java:8.0.21') +} + +test { + useJUnitPlatform() +} diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..62d4c05 Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..a4f0001 --- /dev/null +++ b/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,5 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-6.4.1-bin.zip +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/gradlew b/gradlew new file mode 100644 index 0000000..fbd7c51 --- /dev/null +++ b/gradlew @@ -0,0 +1,185 @@ +#!/usr/bin/env sh + +# +# Copyright 2015 the original author or 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 UN*X +## +############################################################################## + +# Attempt to set APP_HOME +# Resolve links: $0 may be a link +PRG="$0" +# Need this for relative symlinks. +while [ -h "$PRG" ] ; do + ls=`ls -ld "$PRG"` + link=`expr "$ls" : '.*-> \(.*\)$'` + if expr "$link" : '/.*' > /dev/null; then + PRG="$link" + else + PRG=`dirname "$PRG"`"/$link" + fi +done +SAVED="`pwd`" +cd "`dirname \"$PRG\"`/" >/dev/null +APP_HOME="`pwd -P`" +cd "$SAVED" >/dev/null + +APP_NAME="Gradle" +APP_BASE_NAME=`basename "$0"` + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD="maximum" + +warn () { + echo "$*" +} + +die () { + echo + echo "$*" + echo + exit 1 +} + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "`uname`" in + CYGWIN* ) + cygwin=true + ;; + Darwin* ) + darwin=true + ;; + MINGW* ) + msys=true + ;; + NONSTOP* ) + nonstop=true + ;; +esac + +CLASSPATH=$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" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then + MAX_FD_LIMIT=`ulimit -H -n` + if [ $? -eq 0 ] ; then + if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then + MAX_FD="$MAX_FD_LIMIT" + fi + ulimit -n $MAX_FD + if [ $? -ne 0 ] ; then + warn "Could not set maximum file descriptor limit: $MAX_FD" + fi + else + warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" + fi +fi + +# For Darwin, add options to specify how the application appears in the dock +if $darwin; then + GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" +fi + +# For Cygwin or MSYS, switch paths to Windows format before running java +if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then + APP_HOME=`cygpath --path --mixed "$APP_HOME"` + CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` + + JAVACMD=`cygpath --unix "$JAVACMD"` + + # We build the pattern for arguments to be converted via cygpath + ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` + SEP="" + for dir in $ROOTDIRSRAW ; do + ROOTDIRS="$ROOTDIRS$SEP$dir" + SEP="|" + done + OURCYGPATTERN="(^($ROOTDIRS))" + # Add a user-defined pattern to the cygpath arguments + if [ "$GRADLE_CYGPATTERN" != "" ] ; then + OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" + fi + # Now convert the arguments - kludge to limit ourselves to /bin/sh + i=0 + for arg in "$@" ; do + CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` + CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option + + if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition + eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` + else + eval `echo args$i`="\"$arg\"" + fi + i=`expr $i + 1` + done + case $i in + 0) set -- ;; + 1) set -- "$args0" ;; + 2) set -- "$args0" "$args1" ;; + 3) set -- "$args0" "$args1" "$args2" ;; + 4) set -- "$args0" "$args1" "$args2" "$args3" ;; + 5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; + 6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; + 7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; + 8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; + 9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; + esac +fi + +# Escape application args +save () { + for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done + echo " " +} +APP_ARGS=`save "$@"` + +# Collect all arguments for the java command, following the shell quoting and substitution rules +eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" + +exec "$JAVACMD" "$@" diff --git a/gradlew.bat b/gradlew.bat new file mode 100644 index 0000000..5093609 --- /dev/null +++ b/gradlew.bat @@ -0,0 +1,104 @@ +@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=. +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%" == "0" goto init + +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 init + +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 + +:init +@rem Get command-line arguments, handling Windows variants + +if not "%OS%" == "Windows_NT" goto win9xME_args + +:win9xME_args +@rem Slurp the command line arguments. +set CMD_LINE_ARGS= +set _SKIP=2 + +:win9xME_args_slurp +if "x%~1" == "x" goto execute + +set CMD_LINE_ARGS=%* + +: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 %CMD_LINE_ARGS% + +:end +@rem End local scope for the variables with windows NT shell +if "%ERRORLEVEL%"=="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! +if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 +exit /b 1 + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/settings.gradle b/settings.gradle new file mode 100644 index 0000000..e0e91af --- /dev/null +++ b/settings.gradle @@ -0,0 +1 @@ +rootProject.name = 'tdd-mortgage-lender' diff --git a/src/main/java/com/example/demo/Lender.java b/src/main/java/com/example/demo/Lender.java new file mode 100644 index 0000000..4bb78d0 --- /dev/null +++ b/src/main/java/com/example/demo/Lender.java @@ -0,0 +1,27 @@ +package com.example.demo; + +public class Lender { + long funds=0l; + public long getAvailableFunds() { + return funds; + } + public void addFunds(long amt) { + if (amt<=0) { + throw new IllegalArgumentException("Amount added must be greater than zero."); + } else { + funds=Math.addExact(funds, amt); + } + } + public boolean checkRequest(LoanApplicant applicant) { + return applicant.getRequestedAmount()<=funds; + } + public double calculateMonthlyPayment(long principal,float annualRate,int numPayments) { + return Math.round(((principal*((annualRate/12)*Math.pow((1+annualRate/12),numPayments)))/(Math.pow(1+(annualRate/12),numPayments)-1)*100))/100d; + } + public boolean isGoodLoanCandidate(LoanApplicant applicant) { + if (applicant.getMonthlyGrossIncome()<=0) { + return false; + } + return applicant.getCreditScore()>=620&&funds>=applicant.getRequestedAmount()*0.25&&(double)applicant.getMonthlyDebtLoad()/applicant.getMonthlyGrossIncome()<0.36; + } +} diff --git a/src/main/java/com/example/demo/LoanApplicant.java b/src/main/java/com/example/demo/LoanApplicant.java new file mode 100644 index 0000000..5cf6203 --- /dev/null +++ b/src/main/java/com/example/demo/LoanApplicant.java @@ -0,0 +1,37 @@ +package com.example.demo; + +final class LoanApplicant { + private final int creditScore; + private final int downPayment; + private final int monthlyDebtLoad; + private final int monthlyGrossIncome; + private final long requestedAmount; + + LoanApplicant(final int downPayment, final long requestedAmount, final int monthlyGrossIncome, final int monthlyDebtLoad, final int creditScore) { + this.downPayment = downPayment; + this.requestedAmount = requestedAmount; + this.monthlyGrossIncome = monthlyGrossIncome; + this.monthlyDebtLoad = monthlyDebtLoad; + this.creditScore = creditScore; + } + + int getCreditScore() { + return creditScore; + } + + int getDownPayment() { + return downPayment; + } + + int getMonthlyDebtLoad() { + return monthlyDebtLoad; + } + + int getMonthlyGrossIncome() { + return monthlyGrossIncome; + } + + long getRequestedAmount() { + return requestedAmount; + } +} diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties new file mode 100644 index 0000000..a692ce4 --- /dev/null +++ b/src/main/resources/application.properties @@ -0,0 +1,6 @@ +spring.datasource.url=jdbc:mysql://localhost/playground?serverTimezone=UTC +spring.datasource.username=sigonasr2 +spring.datasource.password= +spring.datasource.driver-class-name=com.mysql.jdbc.Driver +spring.jpa.hibernate.ddl-auto=update +spring.jpa.database-platform=org.hibernate.dialect.MySQL8Dialect \ No newline at end of file diff --git a/src/test/java/com/example/demo/LenderTest.java b/src/test/java/com/example/demo/LenderTest.java new file mode 100644 index 0000000..409cdaa --- /dev/null +++ b/src/test/java/com/example/demo/LenderTest.java @@ -0,0 +1,250 @@ +package com.example.demo; + +import static org.junit.jupiter.api.Assertions.assertEquals; +import static org.junit.jupiter.api.Assertions.assertThrows; + +import org.junit.jupiter.api.Test; + +final class LenderTest { + + @Test + void getAvailableFundsReturnsZeroByDefault() { + //Setup + final Lender lender = new Lender(); + final long expected = 0L; + + //Exercise + final long actual = lender.getAvailableFunds(); + + //Assert + assertEquals(expected,actual + ,"Test initializing funds."); + + //Teardown + } + @Test + void addFundsThrowsAnExceptionForZero(){ + //Setup + final Lender lender = new Lender(); + final String expected = "Amount added must be greater than zero."; + + //Exercise + final Exception actual = assertThrows(IllegalArgumentException.class, + () -> lender.addFunds(0L)); + + //Assert + assertEquals(expected,actual.getMessage() + ,"Test increasing by less than 1"); + } + @Test + void addFundsIncreasesAvailableFundsByOne(){ + //Setup + final Lender lender = new Lender(); + final long expected = 1L; + + //Exercise + lender.addFunds(expected); + + final long actual = lender.getAvailableFunds(); + + //Assert + assertEquals(expected,actual + ,"Increase available funds by 1"); + } + @Test + void addFundsThrowsAnExceptionForNegativeValue(){ + //Setup + final Lender lender = new Lender(); + final String expected = "Amount added must be greater than zero."; + + //Exercise + final Exception actual = assertThrows(IllegalArgumentException.class, + () -> lender.addFunds(Long.MIN_VALUE)); + + //Assert + assertEquals(expected,actual.getMessage() + ,"Test increasing by less than 1"); + } + @Test + void addFundsIncreasesAvailableFundsByTwo(){ + //Setup + final Lender lender = new Lender(); + final long expected = 2L; + + //Exercise + lender.addFunds(expected); + + final long actual = lender.getAvailableFunds(); + + //Assert + assertEquals(expected,actual + ,"Test Increasing available funds"); + } + @Test + void addFundsIncreasesAvailableFundsByThreeThenFour(){ + //Setup + final Lender lender = new Lender(); + final long expected = 7L; + + //Exercise + lender.addFunds(3L); + lender.addFunds(4L); + + final long actual = lender.getAvailableFunds(); + + //Assert + assertEquals(expected,actual + ,"Test Increasing available funds multiple times"); + } + @Test + void addFundsThrowExceptionIfOverflowWillHappen(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(Long.MAX_VALUE); + final String expected = "long overflow"; + + //Exercise + final Exception actual = assertThrows(ArithmeticException.class, + () -> lender.addFunds(1L)); + + //Assert + assertEquals(expected,actual.getMessage() + ,"Prevent overflow errors"); + } + @Test + void rejectHighLoanAmounts(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,7900l,81829,0,860); + + + //Assert + assertEquals(false,lender.checkRequest(applicant) + ,"Deny applicants that offer high loan amounts"); + } + @Test + void acceptLowLoanAmounts(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,3200l,81829,0,860); + + + //Assert + assertEquals(true,lender.checkRequest(applicant) + ,"Accept applicants that offer low loan amounts"); + } + @Test + void calculateMonthlyMortgagePayment(){ + //Setup + final Lender lender = new Lender(); + + //monthlyPayment = principal * ((interestRate/12) * (1+(interestRate/12))^numberOfPayments) / ((1 + (interestRate/12))^numberOfPayments - 1) + long principal = 250000l; + float annualRate = 0.04f; + int numPayments = 360; + + //Assert + assertEquals(1193.54d,lender.calculateMonthlyPayment(principal,annualRate,numPayments) + ,"Calculate Monthly Mortgage Payments properly"); + } + @Test + void isGoodLoanCandidate(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,3200l,81829,0,860); + + //Assert + assertEquals(true,lender.isGoodLoanCandidate(applicant) + ,"Accept good Debt-to-Income applicants"); + } + @Test + void denyRequestedMortageDebtToIncomeTooHigh(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,3200l,400,200,860); + + //Assert + assertEquals(false,lender.isGoodLoanCandidate(applicant) + ,"Deny bad Debt-to-Income applicants"); + } + @Test + void denyRequestedMortageDebtToIncomeTooHigh2(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,3200l,1000,360,860); + + //Assert + assertEquals(false,lender.isGoodLoanCandidate(applicant) + ,"Deny bad Debt-to-Income applicants"); + } + @Test + void acceptRequestedMortageDebtToIncomeGoodEnough(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,3200l,1000,359,860); + + //Assert + assertEquals(true,lender.isGoodLoanCandidate(applicant) + ,"Accept good Debt-to-Income applicants"); + } + @Test + void acceptRequestedMortageDebtCreditScoreGoodEnough(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,3200l,1000,359,620); + + //Assert + assertEquals(true,lender.isGoodLoanCandidate(applicant) + ,"Accept good credit scores"); + } + @Test + void denyRequestedMortageDebtCreditScoreTooLow(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,3200l,1000,359,619); + + //Assert + assertEquals(false,lender.isGoodLoanCandidate(applicant) + ,"Deny credit scores that are too low"); + } + @Test + void denyRequestedMortageDebtAmountSavedTooLow(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,12801l,1000,359,620); + + //Assert + assertEquals(false,lender.isGoodLoanCandidate(applicant) + ,"Deny Amount Saved too low."); + } + @Test + void acceptRequestedMortageDebtAmountSavedHighEnough(){ + //Setup + final Lender lender = new Lender(); + lender.addFunds(3200l); + + LoanApplicant applicant = new LoanApplicant(640000,12800l,1000,359,620); + + //Assert + assertEquals(true,lender.isGoodLoanCandidate(applicant) + ,"Accept Amount Saved is 25% or more of requested amount."); + } +} \ No newline at end of file