Initial source

classTemplate.cls

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+public with sharing class {{classTemplate}} {
+    public String getValue() {
+        return '1';
+    }
+}

classTemplate.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="urn:metadata.tooling.soap.sforce.com" fqn="{{classTemplate}}">
+    <apiVersion>42.0</apiVersion>
+    <status>Active</status>
+</ApexClass>

createtests.sh

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+#!/bin/bash
+
+projectName="testProject"
+
+rm -rf $projectName
+
+sfdx force:project:create -n $projectName
+sourcePath="$projectName/force-app/main/classes"
+mkdir -p $sourcePath
+
+counter=1
+while [ $counter -le 10 ]
+do
+
+  echo "Running $counter"
+
+  classTemplate="classTemplate$counter"
+  classTemplateMethod="classTemplateMethod$counter"
+  testTemplate="testTemplate$counter"
+  testTemplateMethod="testTemplateMethod$counter"
+
+
+  classTemplateFile=`cat classTemplate.cls`
+  classTemplateFileMetadata=`cat classTemplate.cls-meta.xml`
+  testTemplateFile=`cat testTemplate.cls`
+  testTemplateFileMetadata=`cat testTemplate.cls-meta.xml`
+
+  # update classTemplate.cls
+  classTemplateFile=${classTemplateFile//$"{{classTemplate}}"/$classTemplate}
+
+  # update classTemplate.cls-meta.xml
+  classTemplateFileMetadata=${classTemplateFileMetadata//$"{{classTemplate}}"/$classTemplate}
+
+  # update testTemplate.cls
+  testTemplateFile=${testTemplateFile//$"{{testTemplate}}"/$testTemplate}
+  testTemplateFile=${testTemplateFile//$"{{classTemplate}}"/$classTemplate}
+
+  # update testTemplate.cls-meta.xml
+  testTemplateFileMetadata=${testTemplateFileMetadata//$"{{testTemplate}}"/$testTemplate}
+
+  # create files
+  echo "$classTemplateFile" > "$sourcePath"/"$classTemplate".cls
+  echo "$classTemplateFileMetadata" > "$sourcePath"/"$testTemplate".cls-meta.xml
+  echo "$testTemplateFile" > "$sourcePath"/"$testTemplate".cls
+  echo "$testTemplateFileMetadata" > "$sourcePath"/"$classTemplate".cls-meta.xml
+
+  ((counter++))
+done
+
+cd $projectName
+
+sfdx force:org:create -s -f config/project-scratch-def.json
+sfdx force:source:push
+sfdx force:apex:test:run -r human
+
+echo "Complete"

testTemplate.cls

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+@isTest
+private class {{testTemplate}} {
+    @isTest
+    static void testGetValue() {
+        {{classTemplate}} template = new {{classTemplate}}();
+        System.assertEquals(template.getValue(), '1');
+    }
+}

testTemplate.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="urn:metadata.tooling.soap.sforce.com" fqn="{{testTemplate}}">
+    <apiVersion>42.0</apiVersion>
+    <status>Active</status>
+</ApexClass>